Dichloroacetic acid
Walker Water System
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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.899 ppb | 32 | 16 | ND - 3.00 ppb |
| 2019 | 0.588 ppb | 32 | 24 | ND - 1.30 ppb |
| 2020 | 0.254 ppb | 16 | 7 | ND - 0.820 ppb |
| 2021 | 0.765 ppb | 16 | 7 | ND - 3.20 ppb |
| 2022 | 0.194 ppb | 16 | 5 | ND - 0.750 ppb |
| 2023 | 0.211 ppb | 16 | 4 | ND - 1.40 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 |
|---|---|---|
| 2018-02-02 | 35371888001 | ND |
| 2018-02-02 | 35371888002 | ND |
| 2018-02-02 | 35371888003 | ND |
| 2018-02-02 | 35371888004 | ND |
| 2018-02-02 | 35371888001 | ND |
| 2018-02-02 | 35371888002 | ND |
| 2018-02-02 | 35371888003 | ND |
| 2018-02-02 | 35371888004 | ND |
| 2018-05-03 | 35390312001 | 2.30 ppb |
| 2018-05-03 | 35390312002 | 2.40 ppb |
| 2018-05-03 | 35390312003 | 3.00 ppb |
| 2018-05-03 | 35390312004 | 1.90 ppb |
| 2018-05-03 | 35390312001 | 2.30 ppb |
| 2018-05-03 | 35390312002 | 2.40 ppb |
| 2018-05-03 | 35390312003 | 3.00 ppb |
| 2018-05-03 | 35390312004 | 1.90 ppb |
| 2018-08-07 | 35409811001 | ND |
| 2018-08-07 | 35409811002 | ND |
| 2018-08-07 | 35409811003 | ND |
| 2018-08-07 | 35409811004 | ND |
| 2018-08-07 | 35409811001 | ND |
| 2018-08-07 | 35409811002 | ND |
| 2018-08-07 | 35409811003 | ND |
| 2018-08-07 | 35409811004 | ND |
| 2018-11-01 | 35428050001 | 1.50 ppb |
| 2018-11-01 | 35428050002 | 1.40 ppb |
| 2018-11-01 | 35428050003 | 0.950 ppb |
| 2018-11-01 | 35428050004 | 0.930 ppb |
| 2018-11-01 | 35428050001 | 1.50 ppb |
| 2018-11-01 | 35428050002 | 1.40 ppb |
| 2018-11-01 | 35428050003 | 0.950 ppb |
| 2018-11-01 | 35428050004 | 0.930 ppb |
| 2019-02-14 | 35448843001 | 1.20 ppb |
| 2019-02-14 | 35448843002 | 0.840 ppb |
| 2019-02-14 | 35448843003 | 1.30 ppb |
| 2019-02-14 | 35448843004 | 1.30 ppb |
| 2019-02-14 | 35448843001 | 1.20 ppb |
| 2019-02-14 | 35448843002 | 0.840 ppb |
| 2019-02-14 | 35448843003 | 1.30 ppb |
| 2019-02-14 | 35448843004 | 1.30 ppb |
| 2019-05-15 | 35469379001 | 0.370 ppb |
| 2019-05-15 | 35469379002 | 0.810 ppb |
| 2019-05-15 | 35469379003 | 0.550 ppb |
| 2019-05-15 | 35469379004 | 0.620 ppb |
| 2019-05-15 | 35469379001 | 0.370 ppb |
| 2019-05-15 | 35469379002 | 0.810 ppb |
| 2019-05-15 | 35469379003 | 0.550 ppb |
| 2019-05-15 | 35469379004 | 0.620 ppb |
| 2019-08-01 | 35486873001 | 0.550 ppb |
| 2019-08-01 | 35486873002 | 0.760 ppb |
| 2019-08-01 | 35486873003 | 0.520 ppb |
| 2019-08-01 | 35486873004 | 0.580 ppb |
| 2019-08-01 | 35486873001 | 0.550 ppb |
| 2019-08-01 | 35486873002 | 0.760 ppb |
| 2019-08-01 | 35486873003 | 0.520 ppb |
| 2019-08-01 | 35486873004 | 0.580 ppb |
| 2019-11-07 | 35511062001 | ND |
| 2019-11-07 | 35511062002 | ND |
| 2019-11-07 | 35511062003 | ND |
| 2019-11-07 | 35511062004 | ND |
| 2019-11-07 | 35511062001 | ND |
| 2019-11-07 | 35511062002 | ND |
| 2019-11-07 | 35511062003 | ND |
| 2019-11-07 | 35511062004 | ND |
| 2020-02-06 | 35529496001 | ND |
| 2020-02-06 | 35529496002 | 0.480 ppb |
| 2020-02-06 | 35529496003 | ND |
| 2020-02-06 | 35529496004 | 0.480 ppb |
| 2020-05-08 | 35548831001 | ND |
| 2020-05-08 | 35548831002 | ND |
| 2020-05-08 | 35548831003 | ND |
| 2020-05-08 | 35548831004 | ND |
| 2020-08-06 | 35569084001 | 0.300 ppb |
| 2020-08-06 | 35569084002 | ND |
| 2020-08-06 | 35569084003 | ND |
| 2020-08-06 | 35569084004 | 0.480 ppb |
| 2020-11-06 | 35590483001 | 0.820 ppb |
| 2020-11-06 | 35590483002 | 0.730 ppb |
| 2020-11-06 | 35590483003 | ND |
| 2020-11-06 | 35590483004 | 0.780 ppb |
| 2021-02-05 | 35610002001 | ND |
| 2021-02-05 | 35610002002 | ND |
| 2021-02-05 | 35610002003 | ND |
| 2021-02-05 | 35610002004 | ND |
| 2021-05-06 | 35631659001 | ND |
| 2021-05-06 | 35631659002 | ND |
| 2021-05-06 | 35631659003 | 0.560 ppb |
| 2021-05-06 | 35631659004 | 0.390 ppb |
| 2021-08-05 | 35653771001 | 3.20 ppb |
| 2021-08-05 | 35653771002 | 2.70 ppb |
| 2021-08-05 | 35653771003 | 2.80 ppb |
| 2021-08-05 | 35653771004 | 2.30 ppb |
| 2021-11-05 | 35676292001 | ND |
| 2021-11-05 | 35676292002 | 0.290 ppb |
| 2021-11-05 | 35676292003 | ND |
| 2021-11-05 | 35676292004 | ND |
| 2022-02-10 | 35696562005 | 0.540 ppb |
| 2022-02-10 | 35696562006 | 0.650 ppb |
| 2022-02-10 | 35696562007 | 0.550 ppb |
| 2022-02-10 | 35696562008 | 0.620 ppb |
| 2022-05-06 | 35715922001 | ND |
| 2022-05-06 | 35715922002 | ND |
| 2022-05-06 | 35715922003 | ND |
| 2022-05-06 | 35715922004 | 0.750 ppb |
| 2022-08-17 | 35741191001 | ND |
| 2022-08-17 | 35741191002 | ND |
| 2022-08-17 | 35741191003 | ND |
| 2022-08-17 | 35741191004 | ND |
| 2022-11-04 | 35758151001 | ND |
| 2022-11-04 | 35758151002 | ND |
| 2022-11-04 | 35758151003 | ND |
| 2022-11-04 | 35758151004 | ND |
| 2023-02-03 | 35776989001 | ND |
| 2023-02-03 | 35776989002 | ND |
| 2023-02-03 | 35776989003 | ND |
| 2023-02-03 | 35776989004 | ND |
| 2023-05-05 | 35797785001 | ND |
| 2023-05-05 | 35797785002 | ND |
| 2023-05-05 | 35797785003 | ND |
| 2023-05-05 | 35797785004 | ND |
| 2023-08-02 | 35818085001 | 0.620 ppb |
| 2023-08-02 | 35818085002 | 0.710 ppb |
| 2023-08-02 | 35818085003 | 0.650 ppb |
| 2023-08-02 | 35818085004 | 1.40 ppb |
| 2023-11-03 | 35839250001 | ND |
| 2023-11-03 | 35839250002 | ND |
| 2023-11-03 | 35839250003 | ND |
| 2023-11-03 | 35839250004 | ND |