Dichloroacetic acid
Metropolitan Utilities District
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 | 14.5 ppb | 48 | 48 | 5.99 ppb - 28.6 ppb |
| 2019 | 18.8 ppb | 48 | 48 | 7.27 ppb - 36.0 ppb |
| 2020 | 15.5 ppb | 48 | 48 | 9.54 ppb - 28.2 ppb |
| 2021 | 13.3 ppb | 48 | 48 | 7.25 ppb - 21.3 ppb |
| 2022 | 13.9 ppb | 48 | 48 | 5.60 ppb - 29.2 ppb |
| 2023 | 13.6 ppb | 48 | 48 | 6.56 ppb - 22.6 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 |
|---|---|---|
| 2018-02-06 | 534078 | 6.19 ppb |
| 2018-02-06 | 534086 | 8.61 ppb |
| 2018-02-06 | 534088 | 7.04 ppb |
| 2018-02-06 | 534083 | 5.99 ppb |
| 2018-02-06 | 534084 | 6.39 ppb |
| 2018-02-06 | 534082 | 8.66 ppb |
| 2018-02-06 | 534085 | 6.19 ppb |
| 2018-02-06 | 534087 | 9.15 ppb |
| 2018-02-06 | 534079 | 8.91 ppb |
| 2018-02-06 | 534077 | 6.38 ppb |
| 2018-02-06 | 534080 | 8.51 ppb |
| 2018-02-06 | 534081 | 8.59 ppb |
| 2018-05-07 | 549803 | 7.66 ppb |
| 2018-05-07 | 549808 | 26.5 ppb |
| 2018-05-07 | 549810 | 26.3 ppb |
| 2018-05-07 | 549802 | 27.1 ppb |
| 2018-05-07 | 549812 | 27.0 ppb |
| 2018-05-07 | 549806 | 17.9 ppb |
| 2018-05-07 | 549805 | 22.1 ppb |
| 2018-05-07 | 549804 | 7.49 ppb |
| 2018-05-07 | 549811 | 26.5 ppb |
| 2018-05-07 | 549809 | 19.1 ppb |
| 2018-05-07 | 549807 | 26.8 ppb |
| 2018-05-07 | 549813 | 28.6 ppb |
| 2018-08-08 | 567012 | 14.1 ppb |
| 2018-08-08 | 567018 | 16.2 ppb |
| 2018-08-08 | 567013 | 15.0 ppb |
| 2018-08-08 | 567014 | 17.0 ppb |
| 2018-08-08 | 567011 | 13.3 ppb |
| 2018-08-08 | 567010 | 13.5 ppb |
| 2018-08-08 | 567008 | 15.0 ppb |
| 2018-08-08 | 567016 | 13.3 ppb |
| 2018-08-08 | 567017 | 15.8 ppb |
| 2018-08-08 | 567015 | 16.2 ppb |
| 2018-08-08 | 567009 | 14.6 ppb |
| 2018-08-08 | 567007 | 18.3 ppb |
| 2018-11-06 | 583372 | 14.3 ppb |
| 2018-11-06 | 583365 | 12.0 ppb |
| 2018-11-06 | 583364 | 13.4 ppb |
| 2018-11-06 | 583370 | 15.5 ppb |
| 2018-11-06 | 583363 | 14.5 ppb |
| 2018-11-06 | 583369 | 10.8 ppb |
| 2018-11-06 | 583371 | 13.2 ppb |
| 2018-11-06 | 583362 | 13.4 ppb |
| 2018-11-06 | 583367 | 12.8 ppb |
| 2018-11-06 | 583366 | 14.6 ppb |
| 2018-11-06 | 583368 | 11.7 ppb |
| 2018-11-06 | 583373 | 13.7 ppb |
| 2019-02-05 | 595235 | 9.22 ppb |
| 2019-02-05 | 595227 | 8.79 ppb |
| 2019-02-05 | 595232 | 9.01 ppb |
| 2019-02-05 | 595226 | 9.39 ppb |
| 2019-02-05 | 595230 | 10.8 ppb |
| 2019-02-05 | 595231 | 9.43 ppb |
| 2019-02-05 | 595224 | 7.27 ppb |
| 2019-02-05 | 595228 | 8.80 ppb |
| 2019-02-05 | 595233 | 9.97 ppb |
| 2019-02-05 | 595229 | 10.6 ppb |
| 2019-02-05 | 595234 | 8.81 ppb |
| 2019-02-05 | 595225 | 8.62 ppb |
| 2019-05-07 | 600558 | 35.9 ppb |
| 2019-05-07 | 600554 | 31.8 ppb |
| 2019-05-07 | 600563 | 33.5 ppb |
| 2019-05-07 | 600555 | 22.5 ppb |
| 2019-05-07 | 600562 | 34.7 ppb |
| 2019-05-07 | 600561 | 33.4 ppb |
| 2019-05-07 | 600553 | 10.8 ppb |
| 2019-05-07 | 600556 | 33.4 ppb |
| 2019-05-07 | 600557 | 34.5 ppb |
| 2019-05-07 | 600559 | 22.0 ppb |
| 2019-05-07 | 600560 | 36.0 ppb |
| 2019-05-07 | 600552 | 11.5 ppb |
| 2019-08-06 | 622441 | 19.7 ppb |
| 2019-08-06 | 622437 | 23.0 ppb |
| 2019-08-06 | 622438 | 23.4 ppb |
| 2019-08-06 | 622445 | 23.7 ppb |
| 2019-08-06 | 622440 | 20.5 ppb |
| 2019-08-06 | 622444 | 22.5 ppb |
| 2019-08-06 | 622446 | 19.3 ppb |
| 2019-08-06 | 622439 | 16.1 ppb |
| 2019-08-06 | 622436 | 21.7 ppb |
| 2019-08-06 | 622447 | 19.2 ppb |
| 2019-08-06 | 622443 | 20.5 ppb |
| 2019-08-06 | 622442 | 22.1 ppb |
| 2019-11-05 | 644368 | 20.8 ppb |
| 2019-11-05 | 644375 | 17.3 ppb |
| 2019-11-05 | 644367 | 13.9 ppb |
| 2019-11-05 | 644369 | 13.1 ppb |
| 2019-11-05 | 644377 | 18.8 ppb |
| 2019-11-05 | 644373 | 13.3 ppb |
| 2019-11-05 | 644366 | 21.2 ppb |
| 2019-11-05 | 644372 | 12.6 ppb |
| 2019-11-05 | 644374 | 15.6 ppb |
| 2019-11-05 | 644371 | 18.6 ppb |
| 2019-11-05 | 644370 | 16.5 ppb |
| 2019-11-05 | 644376 | 18.5 ppb |
| 2020-02-04 | 656180 | 11.0 ppb |
| 2020-02-04 | 656170 | 10.9 ppb |
| 2020-02-04 | 656174 | 9.76 ppb |
| 2020-02-04 | 656175 | 10.3 ppb |
| 2020-02-04 | 656178 | 10.00 ppb |
| 2020-02-04 | 656177 | 10.6 ppb |
| 2020-02-04 | 656181 | 9.85 ppb |
| 2020-02-04 | 656171 | 9.54 ppb |
| 2020-02-04 | 656172 | 10.7 ppb |
| 2020-02-04 | 656176 | 10.9 ppb |
| 2020-02-04 | 656179 | 10.6 ppb |
| 2020-02-04 | 656173 | 10.9 ppb |
| 2020-05-05 | 672086 | 19.5 ppb |
| 2020-05-05 | 672088 | 18.1 ppb |
| 2020-05-05 | 672090 | 10.9 ppb |
| 2020-05-05 | 672092 | 10.00 ppb |
| 2020-05-05 | 672087 | 16.7 ppb |
| 2020-05-05 | 672093 | 17.6 ppb |
| 2020-05-05 | 672095 | 15.2 ppb |
| 2020-05-05 | 672094 | 17.7 ppb |
| 2020-05-05 | 672089 | 14.6 ppb |
| 2020-05-05 | 672096 | 14.2 ppb |
| 2020-05-05 | 672091 | 12.3 ppb |
| 2020-05-05 | 672097 | 16.7 ppb |
| 2020-08-04 | 681784 | 24.7 ppb |
| 2020-08-04 | 681794 | 28.2 ppb |
| 2020-08-04 | 681788 | 20.3 ppb |
| 2020-08-04 | 681792 | 14.1 ppb |
| 2020-08-04 | 681793 | 24.1 ppb |
| 2020-08-04 | 681783 | 26.8 ppb |
| 2020-08-04 | 681790 | 24.7 ppb |
| 2020-08-04 | 681785 | 23.6 ppb |
| 2020-08-04 | 681789 | 25.0 ppb |
| 2020-08-04 | 681791 | 24.3 ppb |
| 2020-08-04 | 681787 | 20.8 ppb |
| 2020-08-04 | 681786 | 22.3 ppb |
| 2020-11-10 | 706872 | 17.8 ppb |
| 2020-11-10 | 706877 | 13.5 ppb |
| 2020-11-10 | 706871 | 10.6 ppb |
| 2020-11-10 | 706875 | 12.6 ppb |
| 2020-11-10 | 706867 | 11.9 ppb |
| 2020-11-10 | 706869 | 11.0 ppb |
| 2020-11-10 | 706868 | 12.6 ppb |
| 2020-11-10 | 706866 | 18.0 ppb |
| 2020-11-10 | 706870 | 10.3 ppb |
| 2020-11-10 | 706873 | 13.1 ppb |
| 2020-11-10 | 706874 | 12.0 ppb |
| 2020-11-10 | 706876 | 13.6 ppb |
| 2021-02-02 | 719014 | 8.56 ppb |
| 2021-02-02 | 719008 | 8.17 ppb |
| 2021-02-02 | 719013 | 10.2 ppb |
| 2021-02-02 | 719007 | 7.71 ppb |
| 2021-02-02 | 719004 | 9.64 ppb |
| 2021-02-02 | 719011 | 9.04 ppb |
| 2021-02-02 | 719003 | 8.92 ppb |
| 2021-02-02 | 719005 | 9.90 ppb |
| 2021-02-02 | 719006 | 7.50 ppb |
| 2021-02-02 | 719010 | 7.25 ppb |
| 2021-02-02 | 719009 | 7.64 ppb |
| 2021-02-02 | 719012 | 10.1 ppb |
| 2021-05-04 | 733019 | 10.8 ppb |
| 2021-05-04 | 733020 | 13.4 ppb |
| 2021-05-04 | 733015 | 10.8 ppb |
| 2021-05-04 | 733014 | 13.7 ppb |
| 2021-05-04 | 733021 | 13.8 ppb |
| 2021-05-04 | 733024 | 12.7 ppb |
| 2021-05-04 | 733016 | 10.8 ppb |
| 2021-05-04 | 733017 | 13.0 ppb |
| 2021-05-04 | 733018 | 11.9 ppb |
| 2021-05-04 | 733025 | 14.0 ppb |
| 2021-05-04 | 733022 | 11.2 ppb |
| 2021-05-04 | 733023 | 12.7 ppb |
| 2021-08-04 | 753568 | 20.0 ppb |
| 2021-08-04 | 753569 | 20.6 ppb |
| 2021-08-04 | 753567 | 21.2 ppb |
| 2021-08-04 | 753566 | 19.9 ppb |
| 2021-08-04 | 753563 | 19.5 ppb |
| 2021-08-04 | 753559 | 18.6 ppb |
| 2021-08-04 | 753558 | 17.0 ppb |
| 2021-08-04 | 753564 | 21.3 ppb |
| 2021-08-04 | 753560 | 15.8 ppb |
| 2021-08-04 | 753565 | 16.4 ppb |
| 2021-08-04 | 753562 | 20.0 ppb |
| 2021-08-04 | 753561 | 14.8 ppb |
| 2021-11-03 | 770887 | 12.4 ppb |
| 2021-11-03 | 770888 | 10.6 ppb |
| 2021-11-03 | 770889 | 12.1 ppb |
| 2021-11-03 | 770884 | 12.6 ppb |
| 2021-11-03 | 770878 | 12.0 ppb |
| 2021-11-03 | 770880 | 14.8 ppb |
| 2021-11-03 | 770885 | 10.4 ppb |
| 2021-11-03 | 770879 | 13.7 ppb |
| 2021-11-03 | 770882 | 16.2 ppb |
| 2021-11-03 | 770881 | 15.8 ppb |
| 2021-11-03 | 770883 | 16.0 ppb |
| 2021-11-03 | 770886 | 15.4 ppb |
| 2022-02-23 | 782411 | 8.33 ppb |
| 2022-02-23 | 782410 | 10.2 ppb |
| 2022-02-23 | 782413 | 7.31 ppb |
| 2022-02-23 | 782408 | 8.49 ppb |
| 2022-02-23 | 782409 | 8.54 ppb |
| 2022-02-23 | 782414 | 7.31 ppb |
| 2022-02-23 | 782407 | 7.86 ppb |
| 2022-02-23 | 782417 | 9.26 ppb |
| 2022-02-23 | 782416 | 6.87 ppb |
| 2022-02-23 | 782412 | 7.34 ppb |
| 2022-02-23 | 782415 | 7.34 ppb |
| 2022-02-23 | 782406 | 8.65 ppb |
| 2022-05-03 | 800295 | 5.60 ppb |
| 2022-05-03 | 800294 | 6.30 ppb |
| 2022-05-03 | 800299 | 12.0 ppb |
| 2022-05-03 | 800296 | 13.0 ppb |
| 2022-05-03 | 800301 | 10.00 ppb |
| 2022-05-03 | 800302 | 13.0 ppb |
| 2022-05-03 | 800297 | 13.0 ppb |
| 2022-05-03 | 800291 | 11.0 ppb |
| 2022-05-03 | 800300 | 9.30 ppb |
| 2022-05-03 | 800293 | 14.0 ppb |
| 2022-05-03 | 800292 | 13.0 ppb |
| 2022-05-03 | 800298 | 15.0 ppb |
| 2022-08-03 | 815782 | 25.5 ppb |
| 2022-08-03 | 815789 | 16.3 ppb |
| 2022-08-03 | 815788 | 26.9 ppb |
| 2022-08-03 | 815791 | 29.2 ppb |
| 2022-08-03 | 815786 | 27.2 ppb |
| 2022-08-03 | 815785 | 21.8 ppb |
| 2022-08-03 | 815784 | 26.4 ppb |
| 2022-08-03 | 815783 | 26.0 ppb |
| 2022-08-03 | 815781 | 24.8 ppb |
| 2022-08-03 | 815792 | 20.6 ppb |
| 2022-08-03 | 815790 | 18.1 ppb |
| 2022-08-03 | 815787 | 23.6 ppb |
| 2022-11-08 | 833750 | 9.25 ppb |
| 2022-11-08 | 833753 | 12.4 ppb |
| 2022-11-08 | 833754 | 11.9 ppb |
| 2022-11-08 | 833743 | 14.5 ppb |
| 2022-11-08 | 833745 | 12.2 ppb |
| 2022-11-08 | 833746 | 11.8 ppb |
| 2022-11-08 | 833747 | 14.8 ppb |
| 2022-11-08 | 833748 | 14.0 ppb |
| 2022-11-08 | 833751 | 14.6 ppb |
| 2022-11-08 | 833749 | 10.5 ppb |
| 2022-11-08 | 833752 | 12.1 ppb |
| 2022-11-08 | 833744 | 11.2 ppb |
| 2023-02-07 | 847408 | 12.1 ppb |
| 2023-02-07 | 847407 | 8.57 ppb |
| 2023-02-07 | 847403 | 6.92 ppb |
| 2023-02-07 | 847406 | 9.64 ppb |
| 2023-02-07 | 847405 | 10.4 ppb |
| 2023-02-07 | 847402 | 6.72 ppb |
| 2023-02-07 | 847409 | 11.8 ppb |
| 2023-02-07 | 847412 | 10.2 ppb |
| 2023-02-07 | 847404 | 11.4 ppb |
| 2023-02-07 | 847413 | 11.4 ppb |
| 2023-02-07 | 847410 | 11.5 ppb |
| 2023-02-07 | 847411 | 11.0 ppb |
| 2023-05-02 | 858531 | 8.74 ppb |
| 2023-05-02 | 858533 | 14.8 ppb |
| 2023-05-02 | 858537 | 10.8 ppb |
| 2023-05-02 | 858532 | 13.9 ppb |
| 2023-05-02 | 858534 | 8.59 ppb |
| 2023-05-02 | 858535 | 17.0 ppb |
| 2023-05-02 | 858528 | 6.65 ppb |
| 2023-05-02 | 858527 | 7.52 ppb |
| 2023-05-02 | 858538 | 14.8 ppb |
| 2023-05-02 | 858536 | 15.1 ppb |
| 2023-05-23 | 868095 | 6.56 ppb |
| 2023-05-23 | 868096 | 12.4 ppb |
| 2023-08-08 | 879873 | 18.7 ppb |
| 2023-08-08 | 879868 | 19.6 ppb |
| 2023-08-08 | 879870 | 17.0 ppb |
| 2023-08-08 | 879869 | 19.8 ppb |
| 2023-08-08 | 879866 | 21.3 ppb |
| 2023-08-08 | 879863 | 20.2 ppb |
| 2023-08-08 | 879872 | 21.7 ppb |
| 2023-08-08 | 879864 | 22.6 ppb |
| 2023-08-08 | 879871 | 17.6 ppb |
| 2023-08-08 | 879862 | 21.7 ppb |
| 2023-08-08 | 879865 | 19.8 ppb |
| 2023-08-08 | 879867 | 18.4 ppb |
| 2023-11-07 | 891411 | 17.6 ppb |
| 2023-11-07 | 891415 | 8.99 ppb |
| 2023-11-07 | 891413 | 10.2 ppb |
| 2023-11-07 | 891414 | 11.5 ppb |
| 2023-11-07 | 891416 | 10.8 ppb |
| 2023-11-07 | 891406 | 14.3 ppb |
| 2023-11-07 | 891405 | 16.0 ppb |
| 2023-11-07 | 891407 | 14.5 ppb |
| 2023-11-07 | 891412 | 9.78 ppb |
| 2023-11-07 | 891410 | 13.2 ppb |
| 2023-11-07 | 891408 | 15.6 ppb |
| 2023-11-07 | 891409 | 11.1 ppb |