Know Your Environment. Protect Your Health.

Trichloroacetic acid

Multi-county Water Supply Corporation

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.

 

48

Samples

0

Samples exceeding legal limit (MCL)

35

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.79 ppb85ND - 16.5 ppb
20192.00 ppb84ND - 8.40 ppb
20201.04 ppb86ND - 2.00 ppb
20214.40 ppb881.30 ppb - 12.3 ppb
20224.06 ppb87ND - 11.6 ppb
20231.26 ppb85ND - 4.50 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
2018-02-05AE121551.30 ppb
2018-02-05AE12149ND
2018-06-14AE299891.20 ppb
2018-06-14AE299882.20 ppb
2018-09-19AE406831.10 ppb
2018-09-19AE40685ND
2018-12-11AE4850216.5 ppb
2018-12-11AE48503ND
2019-03-14AE584108.40 ppb
2019-03-14AE584111.70 ppb
2019-06-19AE712834.10 ppb
2019-06-19AE71285ND
2019-09-11AE83001ND
2019-09-11AE829591.80 ppb
2019-12-10AE91878ND
2019-12-10AE91880ND
2020-02-25AE99714ND
2020-02-25AE997221.20 ppb
2020-06-11AF149321.50 ppb
2020-06-11AF149331.000 ppb
2020-08-13AF234372.00 ppb
2020-08-13AF234381.60 ppb
2020-12-03AF363531.000 ppb
2020-12-03AF36354ND
2021-03-08AF456331.30 ppb
2021-03-08AF456381.30 ppb
2021-04-29AF517831.60 ppb
2021-04-29AF517841.60 ppb
2021-08-23AF673427.80 ppb
2021-09-20AF7037912.3 ppb
2021-12-13AF785722.60 ppb
2021-12-13AF785736.70 ppb
2022-03-21AF8975011.6 ppb
2022-03-21AF897521.80 ppb
2022-06-23AG021072.20 ppb
2022-06-23AG02108ND
2022-09-21AG140884.80 ppb
2022-09-21AG140909.50 ppb
2022-12-08AG212641.30 ppb
2022-12-08AG212651.30 ppb
2023-03-20AG33436ND
2023-03-20AG33437ND
2023-06-02AG428911.30 ppb
2023-06-02AG428931.20 ppb
2023-09-19AG56817ND
2023-09-19AG568181.50 ppb
2023-12-12AG663141.60 ppb
2023-12-12AG663174.50 ppb