The Power of Information

National Drinking Water Database


Monochloroacetic acid in California


Monochloroacetic acid is a disinfection byproduct regulated by EPA as one of five haloacetic acids that are formed when chlorine, chloramines or other disinfectants react with organic and inorganic matter in water. [read more]

The Most Polluted Communities in California

191 water utilities reported detecting Monochloroacetic acid in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Monochloroacetic acid level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Sid - Gibson Canyon
Vacaville, CA
4502 of 221.9 ppb
(2.4 to 41.4 ppb)
2Krista Mutual Water Company
Frazier Park, CA
5301 of 119 ppb
(19 ppb)
3Lopez Project
San Luis Obispo,, CA
01 of 312 ppb
(0 to 36 ppb)
4Ramona Municipal Wd
Ramona, CA
30,0003 of 311.23 ppb
(9.7 to 12 ppb)
5California State Prison - Solano
Vacaville, CA
8,5002 of 311.03 ppb
(0 to 30 ppb)
6Skylonda Mutual
Woodside, CA
4311 of 111 ppb
(11 ppb)
7City of Angels
Angels Camp, CA
2,8426 of 1110.5 ppb
(0 to 63.2 ppb)
8Cal American Water Co
Newbury Park, CA
59,6681 of 29.55 ppb
(0 to 19.1 ppb)
9Lake Sherwood Csd
Moorpark,, CA
1,1703 of 69.5 ppb
(0 to 20 ppb)
10Calaveras Pud
San Andreas, CA
5,4002 of 58.96 ppb
(0 to 39.8 ppb)

Health Based Limits for Monochloroacetic acid

StandardDescriptionLevel
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
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. 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
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.200 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.200 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.350 ppb

Violation Summary for Monochloroacetic acid in California

There are no violations reported for this contaminant in California