Know Your Environment. Protect Your Health.

Trichloroacetic acid

Williamson County Municipal Utility District 11

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.

 

44

Samples

0

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.975 ppb42ND - 2.50 ppb
20193.65 ppb882.20 ppb - 5.30 ppb
20201.98 ppb881.40 ppb - 3.40 ppb
20212.35 ppb881.000 ppb - 5.60 ppb
20220.575 ppb84ND - 1.20 ppb
20230.125 ppb81ND - 1.000 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
2018-01-31AE11548ND
2018-04-13AE22376ND
2018-07-12AE331231.40 ppb
2018-10-03AE424862.50 ppb
2019-03-20AE591992.70 ppb
2019-03-20AE592053.00 ppb
2019-05-09AE656405.20 ppb
2019-05-09AE656445.30 ppb
2019-07-23AE754954.10 ppb
2019-07-23AE754964.00 ppb
2019-12-06AE915442.20 ppb
2019-12-06AE915472.70 ppb
2020-03-10AF019611.90 ppb
2020-03-10AF019632.00 ppb
2020-04-16AF069702.30 ppb
2020-04-16AF069723.40 ppb
2020-08-03AF215201.50 ppb
2020-08-03AF215231.80 ppb
2020-10-28AF323841.40 ppb
2020-10-28AF323901.50 ppb
2021-01-28AF415421.000 ppb
2021-01-28AF415441.000 ppb
2021-04-15AF502721.000 ppb
2021-04-15AF502741.10 ppb
2021-07-14AF618665.60 ppb
2021-07-14AF618694.80 ppb
2021-11-15AF765182.30 ppb
2021-11-15AF765192.00 ppb
2022-03-07AF876261.20 ppb
2022-03-07AF876311.20 ppb
2022-04-14AF933451.20 ppb
2022-05-10AF962021.000 ppb
2022-07-14AG04690ND
2022-07-14AG04685ND
2022-10-06AG16260ND
2022-10-06AG16263ND
2023-01-12AG24345ND
2023-01-12AG24349ND
2023-04-11AG362461.000 ppb
2023-04-11AG36267ND
2023-09-06AG55024ND
2023-09-06AG55027ND
2023-11-06AG62351ND
2023-11-06AG62369ND