Know Your Environment. Protect Your Health.

Dichloroacetic acid

Bear Mountain Water Supply

Dichloroacetic 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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201823.6 ppb449.30 ppb - 40.0 ppb
201914.8 ppb555.60 ppb - 27.0 ppb
202023.6 ppb448.20 ppb - 36.0 ppb
202113.9 ppb445.54 ppb - 21.0 ppb
202229.1 ppb2226.2 ppb - 32.0 ppb
202312.2 ppb556.80 ppb - 19.0 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.2 ppb

The EWG Health Guideline of 0.2 ppb for dichloroacetic 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
2018-02-05THAAS 02061811:49.30 ppb
2018-05-07HAA5 05071819-216.0 ppb
2018-07-25HAA5 08091821-640.0 ppb
2018-11-13HAA5 11151803: 229.0 ppb
2019-02-05HAA5 02061903A:25.60 ppb
2019-02-05HAA5S 02061903A:15.60 ppb
2019-05-07HAA5S 0509190512.0 ppb
2019-08-07HAA5 0814190724.0 ppb
2019-11-04HAA5S QB19274827.0 ppb
2020-02-04DBP 02062004:28.20 ppb
2020-05-13DBP9 05132006:218.0 ppb
2020-08-13HAA5 08132013:232.0 ppb
2020-11-04DBP 11042008-236.0 ppb
2021-02-16HAA5 11042008:25.54 ppb
2021-05-05DBP 05052105:29.99 ppb
2021-08-03HAA5S 08042105C:219.0 ppb
2021-11-17HAA5S 11172114:221.0 ppb
2022-09-14HAA5S 09142230-432.0 ppb
2022-10-25HAA5S 10262215B:526.2 ppb
2023-01-19HAA5S 01192309-111.0 ppb
2023-06-15HAA5 06152304:217.4 ppb
2023-09-26HAA5 10042313B219.0 ppb
2023-10-06HAA5 12132334:26.80 ppb
2023-12-06HAA5 12132334-26.80 ppb