Denver, CO

Is Denver Tap Water Safe to Drink?

Last Update4:37 am, October 7, 2021
Denver, CO

The estimated price of bottled water

$1.91 in USD (1.5-liter)

User Submitted Ratings for Denver Tap Water

  • Drinking Water Pollution and Inaccessibility 20% Low
  • Water Pollution 35% Low
  • Drinking Water Quality and Accessibility 80% Very High
  • Water Quality 65% High

The above data is comprised of subjective, user submitted opinions about the water quality and pollution in Denver, measured on a scale from 0% (lowest) to 100% (highest).

Can You Drink Tap Water in Denver?

Yes, Denver's tap water is generally considered safe to drink as Denver has no active health based violations of the Safe Drinking Water Act (SDWA) that we are aware of. Other factors such as lead piping in a home, or low levels of pollutants on immunocompromised individuals, should also be considered, however. For the latest updates on Denver water, please check out its Twitter page

According the EPA’s ECHO database, from July 30, 2018 to Sept. 30, 2021, Denver's water utility, DENVER WATER BOARD, had 1 non-health-based violations of the Safe Drinking Water Act. For more details on the violations, please see our violation history section below. The last violation for Denver was resolved on May 31, 2019. This assessment is based on the DENVER WATER BOARD water system, other water systems in the city may have different results.

While tap water that meets the EPA health guidelines generally won’t make you sick to your stomach, it can still contain regulated and unregulated contaminants present in trace amounts that could potentially cause health issues over the long-run. These trace contaminants may also impact immunocompromised and vulnerable individuals.

The EPA is reviewing if it’s current regulations around pollutant levels in tap water are strict enough, and the health dangers posed by unregulated pollutants, like PFAS.

Water Quality Report for Denver Tap Water

The most recent publicly available numbers for measured contaminant levels in Denver tap water are in its 2020 Water Quality Report. As you can see, there are levels which the EPA considers to be acceptable, but being below the maximum allowable level doesn’t necessarily mean the water is healthy.

Lead in tap water, for example, is currently allowed at up to 15ppb by the EPA, but it has set the ideal goal for lead at zero. This highlights how meeting EPA standards doesn’t necessarily mean local tap water is healthy.

EPA regulations continue to change as it evaluates the long term impacts of chemicals and updates drinking water acceptable levels. The rules around arsenic, as well as, lead and copper are currently being re-evaluated.

There are also a number of "emerging" contaminants that are not currently. For example, PFAS (Per- and polyfluoroalkyl substances), for which the EPA has issued a health advisory. PFAS are called "forever chemicals" since they tend not to break down in the environment or the human body and can accumulate over time.

We recommend looking at the contaminants present in Denver's water quality reports, or getting your home's tap water tested to see if you should be filtering your water.

Denver Tap Water Safe Drinking Water Act Violation History - Prior 10 Years

Below is a ten year history of violations for the water system named DENVER WATER BOARD for Denver in Colorado. For more details please see the "What do these Violations Mean?" section below.

From May 1, 2019 to May 31, 2019, Denver had 1 non-health based Safe Drinking Water Act violation with the violation category being Monitoring and Reporting, more specifically, the violation code was Monitoring, Turbidity (Enhanced SWTR) which falls into the Microbials rule code group, and the Surface Water Treatment Rules rule code family for the following contaminant code: Interim Enhanced Surfsce Water Treatment Rule.

From Jan. 1, 2014 to Dec. 31, 2016, Denver had 93 non-health based Safe Drinking Water Act violations with the violation category being Monitoring and Reporting, more specifically, the violation code was Monitoring, Regular which falls into the Chemicals rule code group, and the Synthetic Organic Chemicals rule code family for the following contaminant codes: Heptachlor, Heptachlor epoxide, HEXACHLOROBENZENE, Benzo(a)pyrene, Pentachlorophenol, Total Polychlorinated Biphenyls (PCB), 1,2-DIBROMO-3-CHLOROPROPANE, ETHYLENE DIBROMIDE, Chlordane, Endrin, BHC-GAMMA, Methoxychlor, Toxaphene, Endothall, Di(2-ethylhexyl) adipate, Simazine, Di(2-ethylhexyl) phthalate, Dinoseb, Hexachlorocyclopentadiene, Aldicarb sulfoxide, Aldicarb sulfone, Carbofuran, Aldicarb, Atrazine, LASSO, BHC-GAMMA, Methoxychlor, Toxaphene, Dalapon, Diquat, Di(2-ethylhexyl) adipate, OXAMYL, Simazine, Di(2-ethylhexyl) phthalate, Picloram, Dinoseb, Hexachlorocyclopentadiene, Carbofuran, Aldicarb, Atrazine, LASSO, Heptachlor, Heptachlor epoxide, 2,4,5-TP, HEXACHLOROBENZENE, Pentachlorophenol, 1,2-DIBROMO-3-CHLOROPROPANE, ETHYLENE DIBROMIDE, Endrin, Methoxychlor, Toxaphene, Dalapon, Diquat, Endothall, Di(2-ethylhexyl) adipate, OXAMYL, Simazine, Di(2-ethylhexyl) phthalate, Dinoseb, Hexachlorocyclopentadiene, Aldicarb sulfoxide, Aldicarb sulfone, Carbofuran, Aldicarb, Atrazine, LASSO, Heptachlor, Heptachlor epoxide, 2,4-D, 2,4,5-TP, Benzo(a)pyrene, Pentachlorophenol, 1,2-DIBROMO-3-CHLOROPROPANE, ETHYLENE DIBROMIDE, Chlordane, Picloram, Total Polychlorinated Biphenyls (PCB), BHC-GAMMA, OXAMYL, Endothall, 2,4-D, Endrin, Chlordane, 2,4-D, Aldicarb sulfoxide, 2,4,5-TP, Total Polychlorinated Biphenyls (PCB), Diquat, Aldicarb sulfone, Benzo(a)pyrene, HEXACHLOROBENZENE, Dalapon, Picloram.

From Jan. 1, 2011 to Dec. 31, 2011, Denver had 21 non-health based Safe Drinking Water Act violations with the violation category being Monitoring and Reporting, more specifically, the violation code was Monitoring, Regular which falls into the Chemicals rule code group, and the Volatile Organic Chemicals rule code family for the following contaminant codes: 1,2,4-Trichlorobenzene, cis-1,2-Dichloroethylene, Xylenes, Total, DICHLOROMETHANE, o-Dichlorobenzene, p-Dichlorobenzene, Vinyl chloride, trans-1,2-Dichloroethylene, 1,2-Dichloroethane, 1,1,1-Trichloroethane, Carbon tetrachloride, 1,2-Dichloropropane, Trichloroethylene, 1,1,2-Trichloroethane, Tetrachloroethylene, CHLOROBENZENE, Benzene, Toluene, Ethylbenzene, Styrene, 1,1-Dichloroethylene.

Is there Lead in Denver Water?

Based on the EPA’s ECHO Database, 90% of the samples taken from the Denver water system, DENVER WATER BOARD, between sample start date and sample end date, were at or below, 0.0041 mg/L of lead in Denver water. This is 27.3% of the 0.015 mg/L action level. This means 10% of the samples taken from Denver contained more lead.

While Denver water testing may have found 0.0041 mg/L of lead in its water, that does not mean your water source has the same amount. The amount of lead in water in a city can vary greatly from neighborhood to neighborhood, or even building to building. Many buildings, particularly older ones, have lead pipes or service lines which can be a source of contamination. To find out if your home has lead, we recommend getting you water tested.

No amount of lead in water is healthy, only less dangerous. As lead accumulates in our bodies over time, even exposure to relatively small amounts can have negative health effects. For more information, please check out our Lead FAQ page.

Are there PFAS in Denver Tap Water?

Currently, testing tap water for PFAS isn’t mandated on a national level. We do have a list of military bases where there have been suspected or confirmed leaks. There appears to be at least one military base - Lowry Air Force Base - near Denver with suspected leaks.

With many potential sources of PFAS in tap water across the US, the best information we currently have about which cities have PFAS in their water is this ewg map, which you can check to see if Denver has been evaluated for yet.

Our stance is better safe than sorry, and that it makes sense to try to purify the tap water just in case.

Denver SDWA Violation History Table - Prior 10 Years

Compliance Period Status Health-Based? Category Code Code Rule Code Contaminant Code Rule Group Code Rule Family Code
05/01/2019 - 05/31/2019 Resolved No Monitoring and Reporting (MR) Monitoring, Turbidity (Enhanced SWTR) (38) Long Term 1 Enhanced Surface Water Treatment Rule (122) Interim Enhanced Surfsce Water Treatment Rule (0300) Microbials (100) Surface Water Treatment Rules (120)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Heptachlor (2065) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Heptachlor epoxide (2067) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) HEXACHLOROBENZENE (2274) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Benzo(a)pyrene (2306) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Pentachlorophenol (2326) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Total Polychlorinated Biphenyls (PCB) (2383) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 1,2-DIBROMO-3-CHLOROPROPANE (2931) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) ETHYLENE DIBROMIDE (2946) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Chlordane (2959) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Endrin (2005) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) BHC-GAMMA (2010) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Methoxychlor (2015) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Toxaphene (2020) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Endothall (2033) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Di(2-ethylhexyl) adipate (2035) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Simazine (2037) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Di(2-ethylhexyl) phthalate (2039) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Dinoseb (2041) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Hexachlorocyclopentadiene (2042) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb sulfoxide (2043) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb sulfone (2044) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Carbofuran (2046) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb (2047) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Atrazine (2050) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) LASSO (2051) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) BHC-GAMMA (2010) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Methoxychlor (2015) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Toxaphene (2020) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Dalapon (2031) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Diquat (2032) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Di(2-ethylhexyl) adipate (2035) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) OXAMYL (2036) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Simazine (2037) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Di(2-ethylhexyl) phthalate (2039) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Picloram (2040) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Dinoseb (2041) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Hexachlorocyclopentadiene (2042) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Carbofuran (2046) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb (2047) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Atrazine (2050) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) LASSO (2051) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Heptachlor (2065) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Heptachlor epoxide (2067) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 2,4,5-TP (2110) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) HEXACHLOROBENZENE (2274) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Pentachlorophenol (2326) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 1,2-DIBROMO-3-CHLOROPROPANE (2931) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) ETHYLENE DIBROMIDE (2946) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Endrin (2005) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Methoxychlor (2015) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Toxaphene (2020) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Dalapon (2031) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Diquat (2032) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Endothall (2033) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Di(2-ethylhexyl) adipate (2035) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) OXAMYL (2036) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Simazine (2037) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Di(2-ethylhexyl) phthalate (2039) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Dinoseb (2041) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Hexachlorocyclopentadiene (2042) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb sulfoxide (2043) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb sulfone (2044) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Carbofuran (2046) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb (2047) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Atrazine (2050) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) LASSO (2051) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Heptachlor (2065) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Heptachlor epoxide (2067) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 2,4-D (2105) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 2,4,5-TP (2110) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Benzo(a)pyrene (2306) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Pentachlorophenol (2326) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 1,2-DIBROMO-3-CHLOROPROPANE (2931) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) ETHYLENE DIBROMIDE (2946) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Chlordane (2959) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Picloram (2040) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Total Polychlorinated Biphenyls (PCB) (2383) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) BHC-GAMMA (2010) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) OXAMYL (2036) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Endothall (2033) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 2,4-D (2105) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Endrin (2005) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Chlordane (2959) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 2,4-D (2105) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb sulfoxide (2043) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) 2,4,5-TP (2110) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Total Polychlorinated Biphenyls (PCB) (2383) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Diquat (2032) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Aldicarb sulfone (2044) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Benzo(a)pyrene (2306) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) HEXACHLOROBENZENE (2274) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Dalapon (2031) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2014 - 12/31/2016 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Synthetic Organic Chemicals (320) Picloram (2040) Chemicals (300) Synthetic Organic Chemicals (320)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) 1,2,4-Trichlorobenzene (2378) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) cis-1,2-Dichloroethylene (2380) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Xylenes, Total (2955) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) DICHLOROMETHANE (2964) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) o-Dichlorobenzene (2968) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) p-Dichlorobenzene (2969) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Vinyl chloride (2976) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) trans-1,2-Dichloroethylene (2979) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) 1,2-Dichloroethane (2980) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) 1,1,1-Trichloroethane (2981) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Carbon tetrachloride (2982) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) 1,2-Dichloropropane (2983) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Trichloroethylene (2984) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) 1,1,2-Trichloroethane (2985) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Tetrachloroethylene (2987) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) CHLOROBENZENE (2989) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Benzene (2990) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Toluene (2991) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Ethylbenzene (2992) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) Styrene (2996) Chemicals (300) Volatile Organic Chemicals (310)
01/01/2011 - 12/31/2011 Resolved No Monitoring and Reporting (MR) Monitoring, Regular (03) Volatile Organic Chemicals (310) 1,1-Dichloroethylene (2977) Chemicals (300) Volatile Organic Chemicals (310)

What do these Violations Mean?

Safe Drinking Water Act Violations categories split into two groups, health based, and non-health based. Generally, health based violations are more serious, though non-health based violations can also be cause for concern.

Health Based Violations

  1. Maximum contaminant levels (MCLs) - maximum allowed contaminant level was exceeded.
  2. Maximum residual disinfectant levels (MRDLs) - maximum allowed disinfectant level was exceeded.
  3. Other violations (Other) - the exact required process to reduce the amounts of contaminants in drinking water was not followed.

Non-Health Based Violations

  1. Monitoring and reporting violations (MR, MON) - failure to conduct the required regular monitoring of drinking water quality, and/or to submit monitoring results on time.
  2. Public notice violations (Other) - failure to immediately alert consumers if there is a serious problem with their drinking water that may pose a risk to public health.
  3. Other violations (Other) - miscellaneous violations, such as failure to issue annual consumer confidence reports or maintain required records.

SDWA Table Key

Field Description
Compliance Period Dates of the compliance period.
Status Current status of the violation.
  • Resolved - The violation has at least one resolving enforcement action. In SDWIS, this indicates that either the system has returned to compliance from the violation, the rule that was violated was no longer applicable, or no further action was needed.
  • Archived - The violation is not Resolved, but is more than five years past its compliance period end date. In keeping with the Enforcement Response Policy, the violation no longer contributes to the public water system's overall compliance status. Unresolved violations are also marked as Archived when a system ceases operations (becomes inactive).
  • Addressed - The violation is not Resolved or Archived, and is addressed by one or more formal enforcement actions.
  • Unaddressed - The violation is not Resolved or Archived, and has not been addressed by formal enforcement.
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Health-Based? Whether the violation is health based.
Category Code
The category of violation that is reported.
  • TT - Treatment Technique Violation
  • MRDL - Maximum Residual Disinfectant Level
  • Other - Other Violation
  • MCL - Maximum Contaminant Level Violation
  • MR - Monitoring and Reporting
  • MON - Monitoring Violation
  • RPT - Reporting Violation
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Code A full description of violation codes can be accessed in the SDWA_REF_CODE_VALUES (CSV) table.
Contaminant Code A code value that represents a contaminant for which a public water system has incurred a violation of a primary drinking water regulation.
Rule Code Code for a National Drinking Water rule.
  • 110 - Total Coliform Rule
  • 121 - Surface Water Treatment Rule
  • 122 - Long Term 1 Enhanced Surface Water Treatment Rule
  • 123 - Long Term 2 Enhanced Surface Water Treatment Rule
  • 130 - Filter Backwash Rule
  • 140 - Ground Water Rule
  • 210 - Stage 1 Disinfectants and Disinfection Byproducts Rule
  • 220 - Stage 2 Disinfectants and Disinfection Byproducts Rule
  • 230 - Total Trihalomethanes
  • 310 - Volatile Organic Chemicals
  • 331 - Nitrates
  • 332 - Arsenic
  • 333 - Inorganic Chemicals
  • 320 - Synthetic Organic Chemicals
  • 340 - Radionuclides
  • 350 - Lead and Copper Rule
  • 410 - Public Notice Rule
  • 420 - Consumer Confidence Rule
  • 430 - Miscellaneous
  • 500 - Not Regulated
  • 111 - Revised Total Coliform Rule
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Rule Group Code Code that uniquely identifies a rule group.
  • 120 - Surface Water Treatment Rules
  • 130 - Filter Backwash Rule
  • 140 - Groundwater Rule
  • 210 - Stage 1 Disinfectants and Disinfection Byproducts Rule
  • 220 - Stage 2 Disinfectants and Disinfection Byproducts Rule
  • 230 - Total Trihalomethanes
  • 310 - Volatile Organic Chemicals
  • 320 - Synthetic Organic Chemicals
  • 330 - Inorganic Chemicals
  • 340 - Radionuclides
  • 350 - Lead and Copper Rule
  • 400 - Other
  • 500 - Not Regulated
  • 110 - Total Coliform Rules
  • 410 - Public Notice Rule
  • 420 - Consumer Confidence Rule
  • 430 - Miscellaneous
show details
Rule Family Code Code for rule family.
  • 100 - Microbials
  • 200 - Disinfectants and Disinfection Byproducts Rule
  • 300 - Chemicals
  • 400 - Other
  • 500 - Not Regulated
show details

For more clarification please visit the EPA's data dictionary.

Is it safe to you Drink Tap Water in Denver?

Yes, Denver’s tap water is generally considered safe to drink as it met the EPA’s water quality mandates in its 2020 Water Quality Report. From April 1, 2018 to June 30, 2021 Denver’s Denver Water Board has had one Safe Drinking Water Act Violation, which was a monitoring violation, not a quality violation, and has been resolved.  One should not get sick from drinking Denver tap water. 

Though Denver’s tap water is generally safe to drink, one should consider the possible safety impacts of low levels of regulated contaminants, unregulated contaminants, and water quality issues caused by severe weather.

While Denver’s tap water is generally safe to drink, long-term residents may consider using water filters for their everyday drinking, as the EPA is still assessing the health impacts of long-term exposure to certain contaminants that they do not yet have regulations for, and long term exposure to certain contaminants which are already regulated, but below the currently acceptable levels. 

Where Does Denver Tap Water Come From?

According to Denver’s 2020 Water Quality Report, Denver Water Board obtains water for its customers from several sources:

Denver’s drinking water comes from rivers, lakes, streams, reservoirs, and springs fed by high-quality mountain snow runoff. Denver Water’s supply is 100% surface water that originates in sources throughout 3,100 square miles of watersheds on both sides of the Continental Divide. 

Denver Water’s water sources are the South Platte River and its tributaries, the streams that feed Dillon Reservoir, and the creeks and canals above the Fraser River. Denver Water stores its water in five mountain reservoirs: Antero, Eleven Mile Canyon, Cheesman, Dillon, and Gross. The water is then sent to the metro area through a complex system of streams, canals, and pipes to be treated from these reservoirs. After treatment, drinking water is fed by gravity and pumps to a method of underground, clean-water reservoirs before continuing to your home or business. More than 3,000 miles of pipe carry water to Denver Water customers. 

Main Contaminants Found in Denver Tap Water

As we mentioned above, Denver tap water meets the requirements set by the EPA. For more precise information please see their 2020 Water Quality Report. Though Denver drinking water meets EPA standards that does not mean it is contaminant free as there are levels that the EPA considers acceptable. Though the EPA regulated contaminants must meet a certain threshold for the city’s water to be deemed acceptable, many are still present in the drinking water at some level. The EPA continues to evaluate the long term impacts of these chemicals as more research is available. For example, the rules around arsenic, as well as, lead and copper are currently being re-evaluated.

Additionally, there are a number of “emerging” contaminants that the EPA has not determined acceptable levels for and is currently researching. For example, Per- and polyfluoroalkyl substances (PFAS), for which the EPA has issued a health advisory. PFAS are also called ‘forever chemicals’ since they tend not to break down in the environment or the human body and can accumulate over time. We do not yet fully understand the dangers of PFAS as they are currently being investigated. We do not have any information on PFAS in Denver’s drink water, so there may be a risk of contamination.

Lead piping is another potential source of contamination for many homes, both through service lines and in your home. The National Resource Defense Council has a great walk-through on how to determine if you may have lead service lines.

So while Denver’s tap water does meet the requirements set by the EPA, it still makes sense to try to purify the tap water further to reduce contaminants to lower levels.

Is Denver Tap Water Safe to Drink - WHO & CDC Consensus

Yes, tap water is drinkable.

Tap Safe includes data from many publicly available sources, including the WHO (World Health Organization), CDC (Center for Disease Control), and user submitted databases, but unfortunately there's not enough data about Denver.

To see user submitted ratings of the water quality for Colorado, see the "User Submitted Ratings" box on this page.

Contaminants


Denver Water Board

EWG's drinking water quality report shows results of tests conducted by the water utility and provided to the Environmental Working Group by the Colorado Department of Public Health & Environment, as well as information from the U.S. EPA Enforcement and Compliance History database (ECHO). For the latest quarter assessed by the U.S. EPA (January 2019 - March 2019), tap water provided by this water utility was in compliance with federal health-based drinking water standards.

Utility details

  • Serves: 1000000
  • Data available: 2012-2017
  • Data Source: Surface water
  • Total: 31

Contaminants That Exceed Guidelines

  • Arsenic
  • Bromodichloromethane
  • Chloroform
  • Dibromochloromethane
  • Dichloroacetic acid
  • Radium%2C combined (-226 & -228)
  • Total trihalomethanes (TTHMs)
  • Trichloroacetic acid

Other Detected Contaminants

  • 2%2C4-D
  • 4-Androstene-3%2C17-dione
  • Antimony
  • Barium
  • Beryllium
  • Bromoform
  • Cadmium
  • Chlorodifluoromethane
  • Chromium (hexavalent)
  • Chromium (total)
  • Dibromoacetic acid
  • Fluoride
  • Haloacetic acids (HAA5)
  • Molybdenum
  • Monobromoacetic acid
  • Monochloroacetic acid
  • Nitrate
  • Nitrate and nitrite
  • Selenium
  • Strontium
  • Thallium
  • Uranium
  • Vanadium

Reminder

Always take extra precautions, the water may be safe to drink when it leaves the sewage treatment plant but it may pick up pollutants during its way to your tap. We advise that you ask locals or hotel staff about the water quality. Also, note that different cities have different water mineral contents.

Sources and Resources


Sources Cited

Can you Drink Tap Water from the Faucet in Denver?

Yes, Denver's tap water is generally considered safe to drink as it met the EPA’s water quality mandates in its 2020 Water Quality Report. From April 1, 2018 to June 30, 2021 Denver’s Denver Water Board has had one Safe Drinking Water Act Violation, which was a monitoring violation, not a quality violation, and has been resolved.  One should not get sick from drinking Denver tap water. 

Though Denver's tap water is generally safe to drink, one should consider the possible safety impacts of low levels of regulated contaminants, unregulated contaminants, and water quality issues caused by severe weather.

While Denver's tap water is generally safe to drink, long-term residents may consider using water filters for their everyday drinking, as the EPA is still assessing the health impacts of long-term exposure to certain contaminants that they do not yet have regulations for, and long term exposure to certain contaminants which are already regulated, but below the currently acceptable levels. 

Where Does Denver Tap Water Come From?

According to Denver's 2020 Water Quality Report, Denver Water Board obtains water for its customers from several sources:

Denver’s drinking water comes from rivers, lakes, streams, reservoirs, and springs fed by high-quality mountain snow runoff. Denver Water’s supply is 100% surface water that originates in sources throughout 3,100 square miles of watersheds on both sides of the Continental Divide. 

Denver Water’s water sources are the South Platte River and its tributaries, the streams that feed Dillon Reservoir, and the creeks and canals above the Fraser River. Denver Water stores its water in five mountain reservoirs: Antero, Eleven Mile Canyon, Cheesman, Dillon, and Gross. The water is then sent to the metro area through a complex system of streams, canals, and pipes to be treated from these reservoirs. After treatment, drinking water is fed by gravity and pumps to a method of underground, clean-water reservoirs before continuing to your home or business. More than 3,000 miles of pipe carry water to Denver Water customers. 

Main Contaminants Found in Denver Tap Water

As we mentioned above, Denver tap water meets the requirements set by the EPA. For more precise information please see their 2020 Water Quality Report. Though Denver drinking water meets EPA standards that does not mean it is contaminant free as there are levels that the EPA considers acceptable. Though the EPA regulated contaminants must meet a certain threshold for the city’s water to be deemed acceptable, many are still present in the drinking water at some level. The EPA continues to evaluate the long term impacts of these chemicals as more research is available. For example, the rules around arsenic, as well as, lead and copper are currently being re-evaluated.

Additionally, there are a number of “emerging” contaminants that the EPA has not determined acceptable levels for and is currently researching. For example, Per- and polyfluoroalkyl substances (PFAS), for which the EPA has issued a health advisory. PFAS are also called ‘forever chemicals’ since they tend not to break down in the environment or the human body and can accumulate over time. We do not yet fully understand the dangers of PFAS as they are currently being investigated. We do not have any information on PFAS in Denver’s drink water, so there may be a risk of contamination.

Lead piping is another potential source of contamination for many homes, both through service lines and in your home. The National Resource Defense Council has a great walk-through on how to determine if you may have lead service lines.

So while Denver's tap water does meet the requirements set by the EPA, it still makes sense to try to purify the tap water further to reduce contaminants to lower levels.

Check tap water safety for other popular destinations

Check tap water safety for other cities in Colorado

Check tap water safety for other countries in North America

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