Know Your Environment. Protect Your Health.

Trichloroacetic acid

Thompson Heights Water System

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)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.988 ppb86ND - 1.50 ppb
20190.575 ppb84ND - 1.40 ppb
20201.31 ppb86ND - 2.90 ppb
20211.09 ppb85ND - 2.30 ppb
20220.575 ppb84ND - 1.20 ppb
20231.44 ppb881.000 ppb - 2.40 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
2018-03-13Q18105210021.30 ppb
2018-03-13Q18105210011.20 ppb
2018-05-15Q18199540031.50 ppb
2018-05-15Q18199540021.30 ppb
2018-08-30Q1835061001ND
2018-08-30Q1835061002ND
2018-12-04Q18497300011.10 ppb
2018-12-04Q18497300021.50 ppb
2019-02-25Q1907959001ND
2019-02-25Q19079590031.20 ppb
2019-05-07Q19222740011.40 ppb
2019-05-07Q1922274002ND
2019-09-11Q19642520021.000 ppb
2019-09-11Q19642520011.000 ppb
2019-11-04Q1975057001ND
2019-11-04Q1975057002ND
2020-01-29Q20035570011.10 ppb
2020-01-29Q20035570021.10 ppb
2020-04-15Q20149560011.50 ppb
2020-04-15Q20149560021.20 ppb
2020-07-23Q20289950012.90 ppb
2020-07-23Q20289950022.70 ppb
2020-12-16Q2049857001ND
2020-12-16Q2049857002ND
2021-03-22Q2107286001ND
2021-03-22Q2107286002ND
2021-06-08Q21151620011.60 ppb
2021-06-08Q21151620021.60 ppb
2021-09-15Q21254600012.30 ppb
2021-09-15Q21254600022.20 ppb
2021-11-17Q2132248001ND
2021-11-17Q21322480021.000 ppb
2022-02-16Q2205735002ND
2022-02-16Q2205735003ND
2022-05-17Q22145430011.20 ppb
2022-05-17Q22145430021.20 ppb
2022-08-17Q22245250011.20 ppb
2022-08-17Q22245250021.000 ppb
2022-11-09Q2233894001ND
2022-11-09Q2233894002ND
2023-01-25Q23035670011.20 ppb
2023-01-25Q23035670021.40 ppb
2023-06-14Q23226420012.40 ppb
2023-06-14Q23226420022.40 ppb
2023-09-06Q23384450021.10 ppb
2023-09-06Q23384450031.000 ppb
2023-11-01Q23468350011.000 ppb
2023-11-01Q23468350021.000 ppb