Trichloroacetic acid
CTWC - Shoreline Region-Guilford System
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 | 8.63 ppb | 16 | 16 | 2.10 ppb - 16.0 ppb |
| 2019 | 6.33 ppb | 16 | 16 | 2.40 ppb - 11.3 ppb |
| 2020 | 9.17 ppb | 16 | 16 | 3.60 ppb - 16.9 ppb |
| 2021 | 9.40 ppb | 16 | 16 | 4.20 ppb - 16.5 ppb |
| 2022 | 10.1 ppb | 16 | 16 | 4.40 ppb - 14.0 ppb |
| 2023 | 14.0 ppb | 16 | 16 | 5.20 ppb - 24.0 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 |
|---|---|---|
| 2018-03-15 | CA03074HAA5 | 5.30 ppb |
| 2018-03-15 | CA03075HAA5 | 9.10 ppb |
| 2018-03-15 | CA03076HAA5 | 9.00 ppb |
| 2018-03-15 | CA03073HAA5 | 7.30 ppb |
| 2018-06-26 | CA80045HAA5 | 16.0 ppb |
| 2018-06-26 | CA80046HAA5 | 11.0 ppb |
| 2018-06-26 | CA80047HAA5 | 9.30 ppb |
| 2018-06-26 | CA80048HAA5 | 8.40 ppb |
| 2018-09-12 | DBP 200505042 | 9.60 ppb |
| 2018-09-12 | DBP 200505043 | 12.9 ppb |
| 2018-09-12 | DBP 200505044 | 13.9 ppb |
| 2018-09-12 | DBP 200505047 | 13.4 ppb |
| 2018-12-17 | DBP 200516237 | 2.10 ppb |
| 2018-12-17 | DBP 200516239 | 4.00 ppb |
| 2018-12-17 | DBP 200516238 | 4.00 ppb |
| 2018-12-17 | DBP 200516235 | 2.70 ppb |
| 2019-03-11 | DBP 200524150 | 2.40 ppb |
| 2019-03-11 | DBP 200524151 | 3.60 ppb |
| 2019-03-11 | DBP 200524152 | 4.70 ppb |
| 2019-03-11 | DBP 200524154 | 4.90 ppb |
| 2019-06-14 | DBP 200536672 | 3.80 ppb |
| 2019-06-14 | DBP 200536674 | 5.10 ppb |
| 2019-06-14 | DBP 200536680 | 5.40 ppb |
| 2019-06-14 | DBP 200536682 | 6.10 ppb |
| 2019-09-17 | DBP 200549479 | 7.10 ppb |
| 2019-09-17 | DBP 200549481 | 7.50 ppb |
| 2019-09-17 | DBP 200549480 | 7.20 ppb |
| 2019-09-17 | DBP 200549478 | 4.80 ppb |
| 2019-12-10 | DBP 200559643 | 10.1 ppb |
| 2019-12-10 | DBP 200559644 | 11.0 ppb |
| 2019-12-10 | DBP 200559645 | 11.3 ppb |
| 2019-12-10 | DBP 200559642 | 6.30 ppb |
| 2020-03-03 | DBP 200567998 | 5.60 ppb |
| 2020-03-05 | DBP 200568574 | 3.60 ppb |
| 2020-03-05 | DBP 200568575 | 6.40 ppb |
| 2020-03-05 | DBP 200568576 | 7.50 ppb |
| 2020-06-16 | DBP 200579546 | 13.1 ppb |
| 2020-06-16 | DBP 200579547 | 10.2 ppb |
| 2020-06-16 | DBP 200579545 | 12.1 ppb |
| 2020-06-16 | DBP 200579543 | 7.90 ppb |
| 2020-09-17 | DBP 200591051 | 5.40 ppb |
| 2020-09-17 | DBP 200591052 | 8.70 ppb |
| 2020-09-17 | DBP 200591053 | 9.00 ppb |
| 2020-09-17 | DBP 200591054 | 11.3 ppb |
| 2020-12-22 | DBP 200602030 | 7.00 ppb |
| 2020-12-22 | DBP 200602031 | 16.9 ppb |
| 2020-12-22 | DBP 200602032 | 11.0 ppb |
| 2020-12-22 | DBP 200602033 | 11.0 ppb |
| 2021-03-15 | DBP 200609845 | 8.30 ppb |
| 2021-03-15 | DBP 200609842 | 4.80 ppb |
| 2021-03-15 | DBP 200609843 | 6.70 ppb |
| 2021-03-15 | DBP 200609844 | 8.20 ppb |
| 2021-06-02 | DBP 200619264 | 9.20 ppb |
| 2021-06-02 | DBP 200619265 | 10.5 ppb |
| 2021-06-02 | DBP 200619266 | 10.9 ppb |
| 2021-06-02 | DBP 200619263 | 7.80 ppb |
| 2021-09-14 | 300059734 300059738 | 11.6 ppb |
| 2021-09-14 | 300059735 300059740 | 15.6 ppb |
| 2021-09-14 | 300059736 300059742 | 15.4 ppb |
| 2021-09-14 | 300059737 300059744 | 16.5 ppb |
| 2021-12-09 | D300117675 300117682 | 6.80 ppb |
| 2021-12-09 | D300117674 300117680 | 8.00 ppb |
| 2021-12-09 | D300117673 300117678 | 5.90 ppb |
| 2021-12-09 | D300117672 300117676 | 4.20 ppb |
| 2022-03-09 | CK83519 | 4.40 ppb |
| 2022-03-09 | CK83520 | 5.30 ppb |
| 2022-03-09 | CK83521 | 5.60 ppb |
| 2022-03-25 | CK95230 | 9.30 ppb |
| 2022-06-16 | CL58844 | 6.20 ppb |
| 2022-06-16 | CL58845 | 14.0 ppb |
| 2022-06-16 | CL58846 | 10.00 ppb |
| 2022-06-16 | CL58847 | 13.0 ppb |
| 2022-09-13 | CM30714 | 6.30 ppb |
| 2022-09-13 | CM30696 | 11.0 ppb |
| 2022-09-13 | CM30695 | 14.0 ppb |
| 2022-09-13 | CM30697 | 14.0 ppb |
| 2022-12-01 | CM97587 | 9.60 ppb |
| 2022-12-01 | CM97588 | 12.0 ppb |
| 2022-12-01 | CM97589 | 13.0 ppb |
| 2022-12-01 | CM97590 | 14.0 ppb |
| 2023-03-22 | CN66487 | 5.20 ppb |
| 2023-03-22 | CN66488 | 7.80 ppb |
| 2023-03-22 | CN66489 | 6.40 ppb |
| 2023-03-22 | CN66490 | 8.10 ppb |
| 2023-06-15 | CO31997 | 19.0 ppb |
| 2023-06-15 | CO31999 | 16.0 ppb |
| 2023-06-15 | CO31998 | 16.0 ppb |
| 2023-06-15 | CO31996 | 8.70 ppb |
| 2023-09-05 | CO90683 | 15.0 ppb |
| 2023-09-05 | CO90684 | 20.0 ppb |
| 2023-09-05 | CO90685 | 20.0 ppb |
| 2023-09-05 | CO90686 | 24.0 ppb |
| 2023-12-07 | CP65078 | 10.00 ppb |
| 2023-12-07 | CP65079 | 16.0 ppb |
| 2023-12-07 | CP65080 | 14.0 ppb |
| 2023-12-07 | CP65081 | 17.0 ppb |