Trichloroacetic acid
LPWD South
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.
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 | 0.973 ppb | 32 | 32 | 0.720 ppb - 2.10 ppb |
| 2019 | 0.790 ppb | 32 | 32 | 0.570 ppb - 0.940 ppb |
| 2020 | 0.656 ppb | 17 | 17 | 0.490 ppb - 0.940 ppb |
| 2021 | 0.691 ppb | 16 | 15 | ND - 1.000 ppb |
| 2022 | 0.876 ppb | 16 | 16 | 0.580 ppb - 1.20 ppb |
| 2023 | 0.809 ppb | 16 | 16 | 0.460 ppb - 1.10 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 |
|---|---|---|
| 2018-02-08 | 35374039001 | 0.820 ppb |
| 2018-02-08 | 35374039002 | 0.740 ppb |
| 2018-02-08 | 35374039003 | 0.940 ppb |
| 2018-02-08 | 35374039004 | 0.870 ppb |
| 2018-02-08 | 35374039001 | 0.820 ppb |
| 2018-02-08 | 35374039002 | 0.740 ppb |
| 2018-02-08 | 35374039003 | 0.940 ppb |
| 2018-02-08 | 35374039004 | 0.870 ppb |
| 2018-05-03 | 35390338001 | 0.940 ppb |
| 2018-05-03 | 35390338002 | 0.970 ppb |
| 2018-05-03 | 35390338003 | 0.960 ppb |
| 2018-05-03 | 35390338004 | 0.930 ppb |
| 2018-05-03 | 35390338001 | 0.940 ppb |
| 2018-05-03 | 35390338002 | 0.970 ppb |
| 2018-05-03 | 35390338003 | 0.960 ppb |
| 2018-05-03 | 35390338004 | 0.930 ppb |
| 2018-08-02 | 35408608001 | 0.750 ppb |
| 2018-08-02 | 35408608002 | 1.20 ppb |
| 2018-08-02 | 35408608003 | 2.10 ppb |
| 2018-08-02 | 35408608004 | 0.720 ppb |
| 2018-08-02 | 35408608001 | 0.750 ppb |
| 2018-08-02 | 35408608002 | 1.20 ppb |
| 2018-08-02 | 35408608003 | 2.10 ppb |
| 2018-08-02 | 35408608004 | 0.720 ppb |
| 2018-11-15 | 35432282001 | 0.820 ppb |
| 2018-11-15 | 35432282002 | 0.820 ppb |
| 2018-11-15 | 35432282003 | 0.990 ppb |
| 2018-11-15 | 35432282004 | 1.000 ppb |
| 2018-11-15 | 35432282001 | 0.820 ppb |
| 2018-11-15 | 35432282002 | 0.820 ppb |
| 2018-11-15 | 35432282003 | 0.990 ppb |
| 2018-11-15 | 35432282004 | 1.000 ppb |
| 2019-02-06 | 35447079001 | 0.780 ppb |
| 2019-02-06 | 35447079002 | 0.800 ppb |
| 2019-02-06 | 35447079003 | 0.900 ppb |
| 2019-02-06 | 35447079004 | 0.850 ppb |
| 2019-02-06 | 35447079001 | 0.780 ppb |
| 2019-02-06 | 35447079002 | 0.800 ppb |
| 2019-02-06 | 35447079003 | 0.900 ppb |
| 2019-02-06 | 35447079004 | 0.850 ppb |
| 2019-05-09 | 35468293001 | 0.760 ppb |
| 2019-05-09 | 35468293002 | 0.810 ppb |
| 2019-05-09 | 35468293003 | 0.940 ppb |
| 2019-05-09 | 35468293004 | 0.880 ppb |
| 2019-05-09 | 35468293001 | 0.760 ppb |
| 2019-05-09 | 35468293002 | 0.810 ppb |
| 2019-05-09 | 35468293003 | 0.940 ppb |
| 2019-05-09 | 35468293004 | 0.880 ppb |
| 2019-08-02 | 35486857001 | 0.810 ppb |
| 2019-08-02 | 35486857002 | 0.870 ppb |
| 2019-08-02 | 35486857003 | 0.930 ppb |
| 2019-08-02 | 35486857004 | 0.810 ppb |
| 2019-08-02 | 35486857001 | 0.810 ppb |
| 2019-08-02 | 35486857002 | 0.870 ppb |
| 2019-08-02 | 35486857003 | 0.930 ppb |
| 2019-08-02 | 35486857004 | 0.810 ppb |
| 2019-11-12 | 35512664001 | 0.570 ppb |
| 2019-11-12 | 35512664002 | 0.630 ppb |
| 2019-11-12 | 35512664003 | 0.700 ppb |
| 2019-11-12 | 35512664004 | 0.600 ppb |
| 2019-11-12 | 35512664001 | 0.570 ppb |
| 2019-11-12 | 35512664002 | 0.630 ppb |
| 2019-11-12 | 35512664003 | 0.700 ppb |
| 2019-11-12 | 35512664004 | 0.600 ppb |
| 2020-02-06 | 35529485001 | 0.600 ppb |
| 2020-02-06 | 35529485002 | 0.570 ppb |
| 2020-02-06 | 35529485003 | 0.660 ppb |
| 2020-02-06 | 35529485004 | 0.580 ppb |
| 2020-05-01 | 35547167001 | 0.510 ppb |
| 2020-05-01 | 35547167002 | 0.490 ppb |
| 2020-05-01 | 35547167003 | 0.550 ppb |
| 2020-05-01 | 35547167004 | 0.520 ppb |
| 2020-08-13 | 35570874001 | 0.600 ppb |
| 2020-08-13 | 35570874002 | 0.700 ppb |
| 2020-08-13 | 35570874003 | 0.770 ppb |
| 2020-08-13 | 35570874004 | 0.740 ppb |
| 2020-11-09 | 35591341001 | 0.740 ppb |
| 2020-11-09 | 35591341002 | 0.780 ppb |
| 2020-11-09 | 35591341003 | 0.940 ppb |
| 2020-11-09 | 35591341004 | 0.830 ppb |
| 2020-11-20 | 35594057001 | 0.580 ppb |
| 2021-02-10 | 35611838001 | ND |
| 2021-02-10 | 35611838002 | 0.670 ppb |
| 2021-02-10 | 35611838003 | 0.790 ppb |
| 2021-02-10 | 35611838004 | 0.640 ppb |
| 2021-05-13 | 35633826001 | 0.400 ppb |
| 2021-05-13 | 35633826002 | 0.430 ppb |
| 2021-05-13 | 35633826003 | 0.640 ppb |
| 2021-05-13 | 35633826004 | 0.500 ppb |
| 2021-08-26 | 35659636001 | 1.000 ppb |
| 2021-08-26 | 35659636002 | 1.000 ppb |
| 2021-08-26 | 35659636003 | 0.950 ppb |
| 2021-08-26 | 35659636004 | 0.990 ppb |
| 2021-11-03 | 35676595001 | 0.730 ppb |
| 2021-11-03 | 35676595002 | 0.700 ppb |
| 2021-11-03 | 35676595003 | 0.800 ppb |
| 2021-11-03 | 35676595004 | 0.810 ppb |
| 2022-02-23 | 35699368001 | 0.930 ppb |
| 2022-02-23 | 35699368002 | 0.910 ppb |
| 2022-02-23 | 35699368003 | 0.940 ppb |
| 2022-02-23 | 35699368004 | 0.910 ppb |
| 2022-05-24 | 35721066007 | 0.720 ppb |
| 2022-05-24 | 35721066008 | 0.600 ppb |
| 2022-05-24 | 35721066009 | 0.740 ppb |
| 2022-05-24 | 35721066010 | 0.580 ppb |
| 2022-08-11 | 35740678001 | 1.000 ppb |
| 2022-08-11 | 35740678002 | 1.20 ppb |
| 2022-08-11 | 35740678003 | 1.20 ppb |
| 2022-08-11 | 35740678004 | 1.20 ppb |
| 2022-11-07 | 35758879001 | 0.680 ppb |
| 2022-11-07 | 35758879002 | 0.780 ppb |
| 2022-11-07 | 35758879003 | 0.830 ppb |
| 2022-11-07 | 35758879004 | 0.790 ppb |
| 2023-02-22 | 35782044001 | 0.850 ppb |
| 2023-02-22 | 35782044002 | 0.930 ppb |
| 2023-02-22 | 35782044003 | 1.10 ppb |
| 2023-02-22 | 35782044004 | 0.740 ppb |
| 2023-05-10 | 35799252001 | 0.930 ppb |
| 2023-05-10 | 35799252002 | 0.830 ppb |
| 2023-05-10 | 35799252003 | 0.740 ppb |
| 2023-05-10 | 35799252004 | 0.890 ppb |
| 2023-08-17 | 35821980001 | 0.910 ppb |
| 2023-08-17 | 35821980002 | 0.950 ppb |
| 2023-08-17 | 35821980003 | 0.940 ppb |
| 2023-08-17 | 35821980004 | 0.940 ppb |
| 2023-11-03 | 35839288001 | 0.580 ppb |
| 2023-11-03 | 35839288002 | 0.580 ppb |
| 2023-11-03 | 35839288003 | 0.460 ppb |
| 2023-11-03 | 35839288004 | 0.570 ppb |