Know Your Environment. Protect Your Health.

Trichloroacetic acid

St John Water District 1

Trichloroacetic acid, one of the group of five haloacetic acids regulated by federal standards, is formed when chlorine or other disinfectants are used to treat drinking water. Haloacetic acids and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.

 

132

Samples

0

Samples exceeding legal limit (MCL)

122

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201816.2 ppb323210.8 ppb - 21.2 ppb
201913.5 ppb3226ND - 18.9 ppb
202012.1 ppb1615ND - 17.9 ppb
202112.9 ppb1615ND - 17.8 ppb
202213.1 ppb20207.40 ppb - 17.3 ppb
202310.7 ppb1614ND - 18.0 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.1 ppb

The EWG Health Guideline of 0.1 ppb for trichloroacetic acid was defined by the California Office of Environmental Health Hazard Assessment's public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against cancer and harm to reproduction and child development.

ppb = parts per billion

All test results

Date Lab ID Result
2018-03-153538054000118.2 ppb
2018-03-153538054000220.5 ppb
2018-03-153538054000318.7 ppb
2018-03-153538054000419.1 ppb
2018-03-153538054000118.2 ppb
2018-03-153538054000220.5 ppb
2018-03-153538054000318.7 ppb
2018-03-153538054000419.1 ppb
2018-06-143539865200119.7 ppb
2018-06-143539865200221.0 ppb
2018-06-143539865200321.2 ppb
2018-06-143539865200421.1 ppb
2018-06-143539865200119.7 ppb
2018-06-143539865200221.0 ppb
2018-06-143539865200321.2 ppb
2018-06-143539865200421.1 ppb
2018-09-063541614300112.1 ppb
2018-09-063541614300212.5 ppb
2018-09-063541614300312.5 ppb
2018-09-063541614300412.7 ppb
2018-09-063541614300112.1 ppb
2018-09-063541614300212.5 ppb
2018-09-063541614300312.5 ppb
2018-09-063541614300412.7 ppb
2018-12-103543635700110.8 ppb
2018-12-103543635700217.3 ppb
2018-12-103543635700311.6 ppb
2018-12-103543635700410.8 ppb
2018-12-103543635700110.8 ppb
2018-12-103543635700217.3 ppb
2018-12-103543635700311.6 ppb
2018-12-103543635700410.8 ppb
2019-03-133545455700115.3 ppb
2019-03-133545455700215.5 ppb
2019-03-133545455700314.6 ppb
2019-03-1335454557004ND
2019-03-133545455700115.3 ppb
2019-03-133545455700215.5 ppb
2019-03-133545455700314.6 ppb
2019-03-1335454557004ND
2019-06-113547528800117.3 ppb
2019-06-113547528800216.6 ppb
2019-06-113547528800316.6 ppb
2019-06-1135475288004ND
2019-06-113547528800117.3 ppb
2019-06-113547528800216.6 ppb
2019-06-113547528800316.6 ppb
2019-06-1135475288004ND
2019-09-123549758900118.3 ppb
2019-09-123549758900218.7 ppb
2019-09-123549758900318.4 ppb
2019-09-123549758900418.9 ppb
2019-09-123549758900118.3 ppb
2019-09-123549758900218.7 ppb
2019-09-123549758900318.4 ppb
2019-09-123549758900418.9 ppb
2019-12-093551759100114.4 ppb
2019-12-093551759100214.5 ppb
2019-12-093551759100316.1 ppb
2019-12-0935517591004ND
2019-12-093551759100114.4 ppb
2019-12-093551759100214.5 ppb
2019-12-093551759100316.1 ppb
2019-12-0935517591004ND
2020-03-11355370390019.20 ppb
2020-03-113553703900212.3 ppb
2020-03-113553703900312.7 ppb
2020-03-1135537039004ND
2020-06-113555625000117.9 ppb
2020-06-113555625000215.6 ppb
2020-06-113555625000315.7 ppb
2020-06-113555625000416.0 ppb
2020-09-033557567500111.6 ppb
2020-09-033557567500211.1 ppb
2020-09-033557567500311.5 ppb
2020-09-033557567500410.6 ppb
2020-12-103559831800112.1 ppb
2020-12-103559831800212.6 ppb
2020-12-103559831800313.0 ppb
2020-12-103559831800412.2 ppb
2021-03-183562054500112.2 ppb
2021-03-193562054500212.4 ppb
2021-03-193562054500312.4 ppb
2021-03-193562054500412.5 ppb
2021-06-303564446900117.8 ppb
2021-06-303564446900217.4 ppb
2021-06-303564446900317.5 ppb
2021-06-303564446900417.4 ppb
2021-09-243566710500114.3 ppb
2021-09-243566710500217.4 ppb
2021-09-243566710500317.5 ppb
2021-09-2435667105004ND
2021-12-21356863050019.20 ppb
2021-12-21356863050029.10 ppb
2021-12-21356863050039.00 ppb
2021-12-21356863050049.70 ppb
2022-03-103570295300110.8 ppb
2022-03-103570295300211.0 ppb
2022-03-103570295300311.0 ppb
2022-03-103570295300410.8 ppb
2022-06-08B2202689-00117.0 ppb
2022-06-08B2202689-00217.3 ppb
2022-06-08B2202689-00317.0 ppb
2022-06-08B2202689-00416.9 ppb
2022-07-253573427200114.6 ppb
2022-07-253573427200215.0 ppb
2022-07-253573427200314.5 ppb
2022-07-253573427200413.7 ppb
2022-09-073574505900115.9 ppb
2022-09-073574505900214.0 ppb
2022-09-073574505900314.6 ppb
2022-09-073574505900415.2 ppb
2022-12-01357634240018.20 ppb
2022-12-01357634240027.40 ppb
2022-12-01357634240038.90 ppb
2022-12-01357634240048.00 ppb
2023-03-1635786614001ND
2023-03-163578661400210.7 ppb
2023-03-163578661400312.6 ppb
2023-03-1635786614004ND
2023-06-213580836900118.0 ppb
2023-06-213580836900217.7 ppb
2023-06-213580836900317.3 ppb
2023-06-213580836900417.2 ppb
2023-09-183582841800110.7 ppb
2023-09-183582841800210.4 ppb
2023-09-183582841800310.9 ppb
2023-09-183582841800411.2 ppb
2023-12-27358505920018.70 ppb
2023-12-27358505920028.00 ppb
2023-12-27358505920038.80 ppb
2023-12-27358505920048.90 ppb