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National Drinking Water Database


Total haloacetic acids (HAAs) in California


Total haloacetic acids refers to the sum of the concentrations of five related disinfection byproducts in a water sample: dichloroacetic acid, trichloroacetic acid, monochloroacetic acid, monobromoacetic acid and dibromoacetic acid. [read more]

The Most Polluted Communities in California

422 water utilities reported detecting Total haloacetic acids (HAAs) in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Total haloacetic acids (HAAs) level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Rabb Park Community Ser. Dist.
Pioneer, CA
1601 of 1121 ppb
(121 ppb)
2Sa#16 Sumner Hill
Madera, CA
1002 of 2113 ppb
(76 to 150 ppb)
3Ramona Municipal Wd
Ramona, CA
30,0003 of 385.33 ppb
(81 to 92 ppb)
4Cathedral Oaks
Loma Rica, CA
1404 of 581.4 ppb
(0 to 130 ppb)
5Bolinas Community Pud
Bolinas, CA
1,20021 of 2175.88 ppb
(29.7 to 171 ppb)
6Lake Alpine Water Company
Arnold, CA
2,6503 of 369.33 ppb
(55 to 84 ppb)
7City of Angels
Angels Camp, CA
2,8427 of 767.53 ppb
(45 to 91 ppb)
8Mcclure Boat Club, Inc.
Snelling,, CA
2212 of 264 ppb
(45 to 83 ppb)
9Awa, Ranch House Estates I.D. #2
Sutter Creek, CA
3504 of 463.48 ppb
(25 to 175 ppb)
10Sonora Water Company Inc
Jamestown, CA
5002 of 262.25 ppb
(45.1 to 79.4 ppb)

Health Based Limits for Total haloacetic acids (HAAs)

StandardDescriptionLevel
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.0.7 ppb
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.60 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.70 ppb
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.70 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.450 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.5200 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.5200 ppb

Violation Summary for Total haloacetic acids (HAAs) in California

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in California since 2004

Violation TypeNumber of Violations
Monitoring and Reporting Disinfection Byproduct Rule161
Over maximum contaminant level, Average69