Trichloroacetic acid
Bcwsa Main Lower 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 | 14.9 ppb | 16 | 16 | 3.14 ppb - 56.2 ppb |
| 2019 | 9.39 ppb | 32 | 32 | 2.80 ppb - 30.0 ppb |
| 2020 | 13.5 ppb | 65 | 65 | 2.05 ppb - 81.0 ppb |
| 2021 | 14.7 ppb | 95 | 95 | 3.32 ppb - 108.0 ppb |
| 2022 | 11.2 ppb | 96 | 96 | 2.66 ppb - 47.5 ppb |
| 2023 | 12.1 ppb | 96 | 96 | 2.31 ppb - 42.0 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 |
|---|---|---|
| 2018-08-13 | 8082937-01 | 5.53 ppb |
| 2018-08-13 | 8082937-02 | 7.82 ppb |
| 2018-08-13 | 8082937-03 | 3.14 ppb |
| 2018-08-13 | 8082937-04 | 6.51 ppb |
| 2018-08-13 | 8082937-05 | 22.7 ppb |
| 2018-08-13 | 8082937-06RE | 56.2 ppb |
| 2018-08-13 | 8082937-07 | 7.97 ppb |
| 2018-08-13 | 8082937-08 | 14.0 ppb |
| 2018-11-12 | 8032032-01 | 5.00 ppb |
| 2018-11-14 | 8032034-01 | 9.00 ppb |
| 2018-11-14 | 8032035-01 | 12.0 ppb |
| 2018-11-14 | 8032036-01 | 19.0 ppb |
| 2018-11-14 | 8032037-01 | 29.0 ppb |
| 2018-11-14 | 8032038-01 | 18.0 ppb |
| 2018-11-14 | 8032039-01 | 18.0 ppb |
| 2018-11-15 | 8034181-01 | 5.00 ppb |
| 2019-02-13 | 9004485-01 | 4.00 ppb |
| 2019-02-13 | 9004486-01 | 10.00 ppb |
| 2019-02-13 | 9004487-01 | 10.00 ppb |
| 2019-02-14 | 9004483-01 | 3.00 ppb |
| 2019-02-14 | 9004484-01 | 6.00 ppb |
| 2019-02-14 | 9004488-01 | 8.00 ppb |
| 2019-02-14 | 9004489-01 | 7.00 ppb |
| 2019-02-15 | 9004482-01 | 3.00 ppb |
| 2019-05-13 | 9015730-01 | 4.00 ppb |
| 2019-05-13 | 9015731-01 | 4.00 ppb |
| 2019-05-13 | 9015732-01 | 4.00 ppb |
| 2019-05-13 | 9015733-01 | 5.00 ppb |
| 2019-05-13 | 9015734-01 | 24.0 ppb |
| 2019-05-13 | 9015735-01 | 22.0 ppb |
| 2019-05-13 | 9015736-01 | 10.00 ppb |
| 2019-05-13 | 9015737-01 | 10.00 ppb |
| 2019-08-12 | 9028010-01 | 3.00 ppb |
| 2019-08-12 | 9028011-01 | 3.00 ppb |
| 2019-08-12 | 9028012-01 | 4.00 ppb |
| 2019-08-12 | 9028013-01 | 4.00 ppb |
| 2019-08-12 | 9028014-01 | 24.0 ppb |
| 2019-08-12 | 9028015-01 | 24.0 ppb |
| 2019-08-12 | 9028016-01 | 6.00 ppb |
| 2019-08-12 | 9028017-01 | 6.00 ppb |
| 2019-11-11 | 9112242-01 | 2.80 ppb |
| 2019-11-11 | 9112242-02 | 2.85 ppb |
| 2019-11-11 | 9112242-03 | 3.54 ppb |
| 2019-11-11 | 9112242-04 | 4.87 ppb |
| 2019-11-11 | 9112242-05 | 26.8 ppb |
| 2019-11-11 | 9112242-06 | 30.0 ppb |
| 2019-11-11 | 9112242-07 | 13.8 ppb |
| 2019-11-11 | 9112242-08 | 7.91 ppb |
| 2020-02-12 | 3.04 ppb | |
| 2020-02-12 | 3.26 ppb | |
| 2020-02-12 | 5.97 ppb | |
| 2020-02-12 | 4.25 ppb | |
| 2020-02-12 | 15.0 ppb | |
| 2020-02-12 | 15.0 ppb | |
| 2020-02-12 | 9.36 ppb | |
| 2020-02-12 | 7.56 ppb | |
| 2020-05-13 | 2.59 ppb | |
| 2020-05-13 | 2.89 ppb | |
| 2020-05-13 | 3.97 ppb | |
| 2020-05-13 | 5.49 ppb | |
| 2020-05-13 | 11.2 ppb | |
| 2020-05-13 | 14.1 ppb | |
| 2020-05-13 | 14.0 ppb | |
| 2020-05-13 | 15.3 ppb | |
| 2020-08-14 | 5.28 ppb | |
| 2020-08-14 | 4.86 ppb | |
| 2020-08-14 | 5.50 ppb | |
| 2020-08-14 | 5.08 ppb | |
| 2020-08-14 | 23.5 ppb | |
| 2020-08-14 | 69.4 ppb | |
| 2020-08-14 | 31.0 ppb | |
| 2020-08-14 | 81.0 ppb | |
| 2020-09-04 | 31.1 ppb | |
| 2020-09-08 | 32.0 ppb | |
| 2020-09-11 | 44.7 ppb | |
| 2020-09-15 | 40.2 ppb | |
| 2020-09-15 | 13.2 ppb | |
| 2020-09-18 | 2.85 ppb | |
| 2020-09-18 | 3.53 ppb | |
| 2020-09-18 | 3.82 ppb | |
| 2020-09-18 | 4.45 ppb | |
| 2020-09-18 | 17.1 ppb | |
| 2020-09-18 | 23.3 ppb | |
| 2020-09-18 | 4.75 ppb | |
| 2020-09-18 | 22.8 ppb | |
| 2020-09-22 | 14.7 ppb | |
| 2020-09-22 | 16.5 ppb | |
| 2020-09-29 | 6.03 ppb | |
| 2020-09-29 | 6.79 ppb | |
| 2020-10-14 | 2.05 ppb | |
| 2020-10-14 | 2.37 ppb | |
| 2020-10-14 | 2.37 ppb | |
| 2020-10-14 | 2.62 ppb | |
| 2020-10-14 | 8.24 ppb | |
| 2020-10-14 | 14.9 ppb | |
| 2020-10-14 | 2.63 ppb | |
| 2020-10-14 | 7.16 ppb | |
| 2020-11-13 | 8.06 ppb | |
| 2020-11-13 | 8.27 ppb | |
| 2020-11-13 | 8.15 ppb | |
| 2020-11-13 | 8.31 ppb | |
| 2020-11-13 | 11.2 ppb | |
| 2020-11-13 | 23.9 ppb | |
| 2020-11-13 | 7.71 ppb | |
| 2020-11-13 | 24.6 ppb | |
| 2020-12-11 | 5.03 ppb | |
| 2020-12-11 | 5.18 ppb | |
| 2020-12-11 | 7.87 ppb | |
| 2020-12-11 | 5.83 ppb | |
| 2020-12-11 | 21.9 ppb | |
| 2020-12-11 | 22.2 ppb | |
| 2020-12-11 | 10.7 ppb | |
| 2020-12-11 | 9.34 ppb | |
| 2021-01-15 | 4.59 ppb | |
| 2021-01-15 | 5.12 ppb | |
| 2021-01-15 | 7.11 ppb | |
| 2021-01-15 | 7.02 ppb | |
| 2021-01-15 | 18.4 ppb | |
| 2021-01-15 | 11.6 ppb | |
| 2021-01-15 | 14.4 ppb | |
| 2021-02-12 | 3.67 ppb | |
| 2021-02-12 | 4.53 ppb | |
| 2021-02-12 | 5.61 ppb | |
| 2021-02-12 | 4.54 ppb | |
| 2021-02-12 | 11.9 ppb | |
| 2021-02-12 | 13.5 ppb | |
| 2021-02-12 | 9.13 ppb | |
| 2021-02-12 | 15.9 ppb | |
| 2021-03-11 | 4.48 ppb | |
| 2021-03-11 | 4.02 ppb | |
| 2021-03-11 | 4.60 ppb | |
| 2021-03-11 | 4.65 ppb | |
| 2021-03-11 | 13.9 ppb | |
| 2021-03-11 | 17.3 ppb | |
| 2021-03-11 | 8.87 ppb | |
| 2021-03-11 | 18.0 ppb | |
| 2021-04-12 | 8.42 ppb | |
| 2021-04-12 | 5.16 ppb | |
| 2021-04-12 | 5.35 ppb | |
| 2021-04-12 | 16.5 ppb | |
| 2021-04-12 | 17.9 ppb | |
| 2021-04-12 | 10.8 ppb | |
| 2021-04-12 | 18.9 ppb | |
| 2021-04-16 | 4.17 ppb | |
| 2021-05-12 | 3.57 ppb | |
| 2021-05-12 | 3.91 ppb | |
| 2021-05-12 | 5.57 ppb | |
| 2021-05-12 | 5.01 ppb | |
| 2021-05-12 | 37.7 ppb | |
| 2021-05-12 | 29.9 ppb | |
| 2021-05-12 | 7.30 ppb | |
| 2021-05-12 | 17.1 ppb | |
| 2021-06-11 | 3.82 ppb | |
| 2021-06-11 | 3.98 ppb | |
| 2021-06-11 | 4.99 ppb | |
| 2021-06-11 | 5.10 ppb | |
| 2021-06-11 | 35.2 ppb | |
| 2021-06-11 | 28.6 ppb | |
| 2021-06-11 | 7.96 ppb | |
| 2021-06-11 | 28.3 ppb | |
| 2021-07-28 | 6.23 ppb | |
| 2021-07-28 | 6.48 ppb | |
| 2021-07-28 | 7.25 ppb | |
| 2021-07-28 | 7.07 ppb | |
| 2021-07-28 | 35.8 ppb | |
| 2021-07-28 | 49.6 ppb | |
| 2021-07-28 | 9.40 ppb | |
| 2021-07-28 | 49.2 ppb | |
| 2021-08-13 | 5.29 ppb | |
| 2021-08-13 | 6.29 ppb | |
| 2021-08-13 | 7.09 ppb | |
| 2021-08-13 | 6.35 ppb | |
| 2021-08-13 | 17.3 ppb | |
| 2021-08-13 | 37.1 ppb | |
| 2021-08-13 | 9.46 ppb | |
| 2021-08-13 | 33.6 ppb | |
| 2021-09-10 | 7.13 ppb | |
| 2021-09-10 | 12.7 ppb | |
| 2021-09-10 | 11.4 ppb | |
| 2021-09-10 | 9.31 ppb | |
| 2021-09-10 | 17.4 ppb | |
| 2021-09-10 | 108.0 ppb | |
| 2021-09-10 | 12.8 ppb | |
| 2021-09-10 | 23.8 ppb | |
| 2021-10-15 | 7.14 ppb | |
| 2021-10-15 | 13.1 ppb | |
| 2021-10-15 | 9.53 ppb | |
| 2021-10-15 | 10.7 ppb | |
| 2021-10-15 | 12.9 ppb | |
| 2021-10-15 | 60.1 ppb | |
| 2021-10-15 | 15.8 ppb | |
| 2021-10-15 | 62.4 ppb | |
| 2021-11-12 | 5.26 ppb | |
| 2021-11-12 | 7.01 ppb | |
| 2021-11-12 | 9.56 ppb | |
| 2021-11-12 | 6.62 ppb | |
| 2021-11-12 | 10.5 ppb | |
| 2021-11-12 | 32.2 ppb | |
| 2021-11-12 | 10.00 ppb | |
| 2021-11-12 | 28.8 ppb | |
| 2021-12-10 | 3.32 ppb | |
| 2021-12-10 | 3.58 ppb | |
| 2021-12-10 | 7.12 ppb | |
| 2021-12-10 | 4.78 ppb | |
| 2021-12-10 | 7.55 ppb | |
| 2021-12-10 | 15.7 ppb | |
| 2021-12-10 | 9.98 ppb | |
| 2021-12-10 | 14.7 ppb | |
| 2022-01-14 | 2.74 ppb | |
| 2022-01-14 | 2.66 ppb | |
| 2022-01-14 | 3.13 ppb | |
| 2022-01-14 | 4.93 ppb | |
| 2022-01-14 | 15.8 ppb | |
| 2022-01-14 | 17.5 ppb | |
| 2022-01-14 | 9.83 ppb | |
| 2022-01-14 | 6.69 ppb | |
| 2022-02-11 | 3.60 ppb | |
| 2022-02-11 | 3.78 ppb | |
| 2022-02-11 | 6.52 ppb | |
| 2022-02-11 | 6.73 ppb | |
| 2022-02-11 | 24.1 ppb | |
| 2022-02-11 | 25.3 ppb | |
| 2022-02-11 | 5.84 ppb | |
| 2022-02-11 | 23.2 ppb | |
| 2022-03-11 | 3.50 ppb | |
| 2022-03-11 | 3.60 ppb | |
| 2022-03-11 | 5.70 ppb | |
| 2022-03-11 | 4.90 ppb | |
| 2022-03-11 | 18.0 ppb | |
| 2022-03-11 | 17.0 ppb | |
| 2022-03-11 | 4.70 ppb | |
| 2022-03-11 | 18.0 ppb | |
| 2022-04-15 | 4.00 ppb | |
| 2022-04-15 | 4.80 ppb | |
| 2022-04-15 | 7.50 ppb | |
| 2022-04-15 | 5.50 ppb | |
| 2022-04-15 | 8.00 ppb | |
| 2022-04-15 | 17.0 ppb | |
| 2022-04-15 | 11.9 ppb | |
| 2022-04-15 | 26.2 ppb | |
| 2022-05-13 | 4.96 ppb | |
| 2022-05-13 | 5.04 ppb | |
| 2022-05-13 | 7.84 ppb | |
| 2022-05-13 | 6.59 ppb | |
| 2022-05-13 | 27.2 ppb | |
| 2022-05-13 | 15.5 ppb | |
| 2022-05-13 | 26.1 ppb | |
| 2022-06-07 | 8.03 ppb | |
| 2022-06-10 | 5.37 ppb | |
| 2022-06-10 | 8.37 ppb | |
| 2022-06-10 | 8.57 ppb | |
| 2022-06-10 | 7.48 ppb | |
| 2022-06-10 | 11.2 ppb | |
| 2022-06-10 | 41.1 ppb | |
| 2022-06-10 | 30.7 ppb | |
| 2022-06-10 | 42.0 ppb | |
| 2022-07-15 | 3.98 ppb | |
| 2022-07-15 | 6.80 ppb | |
| 2022-07-15 | 5.15 ppb | |
| 2022-07-15 | 5.02 ppb | |
| 2022-07-15 | 8.56 ppb | |
| 2022-07-15 | 15.1 ppb | |
| 2022-07-15 | 6.68 ppb | |
| 2022-07-15 | 17.8 ppb | |
| 2022-08-12 | 3.46 ppb | |
| 2022-08-12 | 6.08 ppb | |
| 2022-08-12 | 4.76 ppb | |
| 2022-08-12 | 4.20 ppb | |
| 2022-08-12 | 14.7 ppb | |
| 2022-08-12 | 15.8 ppb | |
| 2022-08-12 | 17.2 ppb | |
| 2022-08-12 | 7.71 ppb | |
| 2022-09-16 | 2.91 ppb | |
| 2022-09-16 | 3.32 ppb | |
| 2022-09-16 | 3.15 ppb | |
| 2022-09-16 | 3.49 ppb | |
| 2022-09-16 | 6.60 ppb | |
| 2022-09-16 | 47.5 ppb | |
| 2022-09-16 | 5.72 ppb | |
| 2022-09-16 | 9.06 ppb | |
| 2022-10-14 | 4.84 ppb | |
| 2022-10-14 | 3.19 ppb | |
| 2022-10-14 | 5.04 ppb | |
| 2022-10-14 | 5.25 ppb | |
| 2022-10-14 | 19.2 ppb | |
| 2022-10-14 | 34.0 ppb | |
| 2022-10-14 | 6.51 ppb | |
| 2022-10-31 | 27.4 ppb | |
| 2022-11-11 | 3.05 ppb | |
| 2022-11-11 | 2.98 ppb | |
| 2022-11-11 | 4.81 ppb | |
| 2022-11-11 | 3.82 ppb | |
| 2022-11-11 | 5.93 ppb | |
| 2022-11-11 | 20.3 ppb | |
| 2022-11-11 | 8.12 ppb | |
| 2022-11-11 | 20.9 ppb | |
| 2022-12-16 | 3.75 ppb | |
| 2022-12-16 | 7.67 ppb | |
| 2022-12-16 | 5.58 ppb | |
| 2022-12-16 | 5.11 ppb | |
| 2022-12-16 | 6.88 ppb | |
| 2022-12-16 | 22.7 ppb | |
| 2022-12-16 | 22.7 ppb | |
| 2022-12-16 | 21.2 ppb | |
| 2023-01-13 | 3.93 ppb | |
| 2023-01-13 | 5.05 ppb | |
| 2023-01-13 | 6.63 ppb | |
| 2023-01-13 | 8.46 ppb | |
| 2023-01-13 | 8.41 ppb | |
| 2023-01-13 | 17.7 ppb | |
| 2023-01-13 | 16.0 ppb | |
| 2023-01-13 | 16.7 ppb | |
| 2023-02-10 | 3.64 ppb | |
| 2023-02-10 | 4.06 ppb | |
| 2023-02-10 | 5.92 ppb | |
| 2023-02-10 | 8.21 ppb | |
| 2023-02-10 | 10.00 ppb | |
| 2023-02-10 | 15.1 ppb | |
| 2023-02-10 | 10.5 ppb | |
| 2023-02-10 | 7.11 ppb | |
| 2023-03-10 | 2.31 ppb | |
| 2023-03-10 | 5.36 ppb | |
| 2023-03-10 | 4.63 ppb | |
| 2023-03-10 | 4.67 ppb | |
| 2023-03-10 | 5.43 ppb | |
| 2023-03-10 | 8.36 ppb | |
| 2023-03-10 | 7.93 ppb | |
| 2023-03-10 | 15.9 ppb | |
| 2023-04-14 | 5.23 ppb | |
| 2023-04-14 | 5.75 ppb | |
| 2023-04-14 | 4.81 ppb | |
| 2023-04-14 | 6.57 ppb | |
| 2023-04-14 | 5.17 ppb | |
| 2023-04-14 | 12.8 ppb | |
| 2023-04-14 | 9.36 ppb | |
| 2023-04-14 | 13.1 ppb | |
| 2023-05-12 | 4.40 ppb | |
| 2023-05-12 | 5.67 ppb | |
| 2023-05-12 | 7.10 ppb | |
| 2023-05-12 | 19.1 ppb | |
| 2023-05-12 | 11.3 ppb | |
| 2023-05-12 | 14.0 ppb | |
| 2023-05-16 | 6.95 ppb | |
| 2023-05-16 | 9.07 ppb | |
| 2023-06-16 | 2.70 ppb | |
| 2023-06-16 | 5.15 ppb | |
| 2023-06-16 | 4.01 ppb | |
| 2023-06-16 | 4.66 ppb | |
| 2023-06-16 | 5.71 ppb | |
| 2023-06-16 | 16.8 ppb | |
| 2023-06-16 | 8.71 ppb | |
| 2023-06-16 | 8.94 ppb | |
| 2023-07-14 | 4.78 ppb | |
| 2023-07-14 | 5.96 ppb | |
| 2023-07-14 | 5.51 ppb | |
| 2023-07-14 | 5.69 ppb | |
| 2023-07-14 | 11.6 ppb | |
| 2023-07-14 | 28.2 ppb | |
| 2023-07-14 | 18.7 ppb | |
| 2023-07-14 | 29.3 ppb | |
| 2023-08-16 | 5.60 ppb | |
| 2023-08-16 | 6.15 ppb | |
| 2023-08-16 | 6.13 ppb | |
| 2023-08-16 | 6.28 ppb | |
| 2023-08-16 | 19.2 ppb | |
| 2023-08-16 | 29.1 ppb | |
| 2023-08-16 | 9.46 ppb | |
| 2023-08-16 | 35.4 ppb | |
| 2023-09-15 | 5.95 ppb | |
| 2023-09-15 | 8.87 ppb | |
| 2023-09-15 | 5.86 ppb | |
| 2023-09-15 | 5.55 ppb | |
| 2023-09-15 | 14.4 ppb | |
| 2023-09-15 | 34.8 ppb | |
| 2023-09-15 | 7.56 ppb | |
| 2023-09-15 | 35.5 ppb | |
| 2023-10-16 | 6.00 ppb | |
| 2023-10-16 | 22.0 ppb | |
| 2023-10-16 | 10.00 ppb | |
| 2023-10-16 | 11.0 ppb | |
| 2023-10-16 | 15.0 ppb | |
| 2023-10-16 | 38.0 ppb | |
| 2023-10-16 | 9.00 ppb | |
| 2023-10-16 | 42.0 ppb | |
| 2023-11-13 | 5.00 ppb | |
| 2023-11-13 | 17.0 ppb | |
| 2023-11-13 | 10.00 ppb | |
| 2023-11-13 | 8.00 ppb | |
| 2023-11-13 | 14.0 ppb | |
| 2023-11-13 | 39.0 ppb | |
| 2023-11-13 | 14.0 ppb | |
| 2023-11-13 | 34.0 ppb | |
| 2023-12-12 | 10.00 ppb | |
| 2023-12-12 | 16.0 ppb | |
| 2023-12-12 | 9.00 ppb | |
| 2023-12-12 | 10.00 ppb | |
| 2023-12-12 | 22.0 ppb | |
| 2023-12-12 | 22.0 ppb | |
| 2023-12-12 | 14.0 ppb | |
| 2023-12-12 | 22.0 ppb |