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CITY Water District

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 2021 - March 2021), tap water provided by this water utility was in compliance with federal health-based drinking water standards.

All Data Provided by EWG

Utility Details

Contra Costa County, California

Serves: 198,000

Data available: 2013-2019*

Source: Surface water

* 2013 testing is for chemicals in EPA’s Third Unregulated Contaminant Monitoring Rule (UCMR-3) only.

Contaminants Detected

13 Exceed EWG Health Guidelines
26 Total Contaminants

What does this mean?

  • Legal does not necessarily equal safe. Getting a passing grade from the federal government does not mean the water meets the latest health guidelines.
  • Legal limits for contaminants in tap water have not been updated in almost 20 years.
  • The best way to ensure clean tap water is to keep pollution out of source water in the first place.

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Specific Contaminants Detected

Bromodichloromethane
Potential Effect: Cancer
95x
EWG Health Guideline

This Utility 5.67 ppb
EWG Health Guideline 0.06 ppb
No Legal Limit

Chloroform
Potential Effect: Cancer
108x
EWG Health Guideline
This Utility 43.0 ppb
EWG Health Guideline 0.4 ppb
No Legal Limit
Dibromochloromethane
Potential Effect: Cancer
5.9x
EWG Health Guideline
This Utility 0.591 ppb
EWG Health Guideline 0.1 ppb
No Legal Limit
Dichloroacetic Acid
Potential Effect: Cancer
53x
EWG Health Guideline
This Utillity 10.6 ppb
EWG Health Guideline 0.2 ppb
No Legal Limit
Haloacetic acids (HAA5)†
Potential Effect: Cancer
387x
EWG Health Guideline
This Utility 38.7 ppb
EWG Health Guideline 0.1 ppb
Legal Limit 60 ppb
1-Butanol
This Utility 1.11 ppb
No EWG Health Guideline
NO Legal Limit
Other Contaminants

Chemicals tested for but not detected from 2014 to 2019:

1,1,1-Trichloroethane , 1,1,2-Trichloroethane , 1,1-Dichloroethane , 1,1-Dichloroethylene , 1,2,3-Trichloropropane , 1,2,4-Trichlorobenzene , 1,2-Dibromo-3-chloropropane (DBCP) , 1,2-Dichloroethane , 1,2-Dichloropropane , 1,3-Butadiene , 1,4-Dioxane , 17-beta-Estradiol , 2,4,5-TP (Silvex) , 2,4-D , 2-methoxyethanol , 2-propen-1-ol , 4-Androstene-3,17-dione , Alachlor (Lasso) , Aldicarb , Aldicarb sulfone , Aldicarb sulfoxide , Alpha-hexachlorocyclohexane , Arsenic , Atrazine , Benzene , Benzo[a]pyrene , Beryllium , Bromate , Bromochloromethane , Bromoform , Bromomethane , Butylated hydroxyanisole , Cadmium , Carbofuran , Carbon tetrachloride , Chlordane , Chlorodifluoromethane , Chloromethane , Chlorpyriphos , cis-1,2-Dichloroethylene , Cobalt , Dalapon , Di(2-ethylhexyl) adipate , Dibromoacetic acid , Dichloromethane (methylene chloride) , Dimethipin , Dinoseb , Diquat , Endothall , Endrin , Equilin , Estriol , Estrone , Ethinyl estradiol , Ethoprop , Ethylene dibromide , Germanium , Heptachlor , Heptachlor epoxide , Hexachlorobenzene (HCB) , Lindane , Mercury (inorganic) , Methoxychlor , Monobromoacetic acid , Monochlorobenzene (chlorobenzene) , Nitrite , o-Dichlorobenzene , o-toluidine , Oxamyl (Vydate) , Oxyflurofen , p-Dichlorobenzene , Pentachlorophenol , Perfluorobutane sulfonate (PFBS) , Perfluoroheptanoic acid (PFHPA) , Perfluorohexane sulfonate (PFHXS) , Perfluorononanoic acid (PFNA) , Perfluorooctane sulfonate (PFOS) , Perfluorooctanoic acid (PFOA) , Permethrin , Polychlorinated biphenyls (PCBs) , Profenofos , Quinoline , Simazine , Styrene , Tebuconazole , Testosterone , Tetrachloroethylene (perchloroethylene) , Thallium , Toluene , Toxaphene , trans-1,2-Dichloroethylene , Tribufos , Trichloroethylene , Vinyl chloride

What about Lead?

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CITY Water District Compliance

From April 2019 to March 2021, Contra Costa Water District complied with health-based drinking water standards.

Information in this section on Contra Costa Water District comes from the U.S. EPA Enforcement and Compliance History Online database (ECHO).

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Contaminant
Contaminants Above Health Guidelines
Testing
Testing 2
Other Contaminants Detected
Testing