Bromodichloromethane
Metropolitan Utilities District
Bromodichloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromodichloromethane 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 | 10.4 ppb | 50 | 50 | 7.14 ppb - 15.4 ppb |
| 2019 | 12.3 ppb | 51 | 50 | ND - 17.8 ppb |
| 2020 | 12.9 ppb | 54 | 51 | ND - 19.2 ppb |
| 2021 | 9.89 ppb | 48 | 48 | 4.35 ppb - 15.6 ppb |
| 2022 | 10.8 ppb | 49 | 49 | 7.32 ppb - 17.9 ppb |
| 2023 | 12.3 ppb | 53 | 52 | ND - 26.5 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.06 ppb
The EWG Health Guideline of 0.06 ppb for bromodichloromethane was based on 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 fetal growth and development.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-02-06 | 534097 | 10.2 ppb |
| 2018-02-06 | 534092 | 7.42 ppb |
| 2018-02-06 | 534095 | 8.85 ppb |
| 2018-02-06 | 534100 | 8.29 ppb |
| 2018-02-06 | 534094 | 7.89 ppb |
| 2018-02-06 | 534090 | 8.03 ppb |
| 2018-02-06 | 534099 | 12.3 ppb |
| 2018-02-06 | 534096 | 8.60 ppb |
| 2018-02-06 | 534089 | 12.0 ppb |
| 2018-02-06 | 534098 | 11.4 ppb |
| 2018-02-06 | 534091 | 7.46 ppb |
| 2018-02-06 | 534093 | 9.82 ppb |
| 2018-05-07 | 549815 | 11.0 ppb |
| 2018-05-07 | 549816 | 13.2 ppb |
| 2018-05-07 | 549817 | 9.10 ppb |
| 2018-05-07 | 549814 | 12.3 ppb |
| 2018-05-07 | 549819 | 8.84 ppb |
| 2018-05-07 | 549825 | 11.3 ppb |
| 2018-05-07 | 549823 | 14.2 ppb |
| 2018-05-07 | 549821 | 10.9 ppb |
| 2018-05-07 | 549820 | 10.4 ppb |
| 2018-05-07 | 549818 | 9.85 ppb |
| 2018-05-07 | 549824 | 11.1 ppb |
| 2018-05-07 | 549822 | 11.4 ppb |
| 2018-05-14 | 542540 | 9.59 ppb |
| 2018-05-14 | 542539 | 9.73 ppb |
| 2018-08-08 | 567027 | 10.6 ppb |
| 2018-08-08 | 567023 | 10.3 ppb |
| 2018-08-08 | 567022 | 10.5 ppb |
| 2018-08-08 | 567029 | 10.4 ppb |
| 2018-08-08 | 567030 | 10.2 ppb |
| 2018-08-08 | 567024 | 10.9 ppb |
| 2018-08-08 | 567021 | 11.2 ppb |
| 2018-08-08 | 567026 | 11.2 ppb |
| 2018-08-08 | 567020 | 9.59 ppb |
| 2018-08-08 | 567028 | 13.8 ppb |
| 2018-08-08 | 567019 | 15.4 ppb |
| 2018-08-08 | 567025 | 10.4 ppb |
| 2018-11-06 | 583375 | 8.85 ppb |
| 2018-11-06 | 583385 | 11.9 ppb |
| 2018-11-06 | 583379 | 7.35 ppb |
| 2018-11-06 | 583374 | 12.7 ppb |
| 2018-11-06 | 583383 | 9.11 ppb |
| 2018-11-06 | 583378 | 12.4 ppb |
| 2018-11-06 | 583376 | 13.0 ppb |
| 2018-11-06 | 583382 | 10.3 ppb |
| 2018-11-06 | 583380 | 12.3 ppb |
| 2018-11-06 | 583384 | 9.92 ppb |
| 2018-11-06 | 583381 | 7.14 ppb |
| 2018-11-06 | 583377 | 7.39 ppb |
| 2019-02-05 | 595239 | 11.4 ppb |
| 2019-02-05 | 595245 | 12.1 ppb |
| 2019-02-05 | 595238 | 10.2 ppb |
| 2019-02-05 | 595243 | 11.6 ppb |
| 2019-02-05 | 595240 | 9.90 ppb |
| 2019-02-05 | 595237 | 9.87 ppb |
| 2019-02-05 | 595236 | 9.12 ppb |
| 2019-02-05 | 595244 | 12.1 ppb |
| 2019-02-05 | 595241 | 11.9 ppb |
| 2019-02-05 | 595246 | 10.2 ppb |
| 2019-02-05 | 595242 | 11.7 ppb |
| 2019-02-05 | 595247 | 11.9 ppb |
| 2019-04-02 | 604245 | 11.4 ppb |
| 2019-04-22 | 604810 | 12.4 ppb |
| 2019-05-07 | 600564 | 9.36 ppb |
| 2019-05-07 | 600571 | 14.2 ppb |
| 2019-05-07 | 600574 | 16.1 ppb |
| 2019-05-07 | 600567 | 14.6 ppb |
| 2019-05-07 | 600570 | 14.7 ppb |
| 2019-05-07 | 600566 | 13.8 ppb |
| 2019-05-07 | 600573 | 15.7 ppb |
| 2019-05-07 | 600575 | 14.7 ppb |
| 2019-05-07 | 600565 | 10.1 ppb |
| 2019-05-07 | 600568 | 15.5 ppb |
| 2019-05-07 | 600572 | 15.1 ppb |
| 2019-05-07 | 600569 | 15.3 ppb |
| 2019-06-10 | 604811 | ND |
| 2019-08-06 | 622452 | 11.3 ppb |
| 2019-08-06 | 622449 | 17.7 ppb |
| 2019-08-06 | 622450 | 17.8 ppb |
| 2019-08-06 | 622455 | 10.3 ppb |
| 2019-08-06 | 622457 | 11.2 ppb |
| 2019-08-06 | 622459 | 10.7 ppb |
| 2019-08-06 | 622448 | 13.1 ppb |
| 2019-08-06 | 622458 | 11.9 ppb |
| 2019-08-06 | 622451 | 12.8 ppb |
| 2019-08-06 | 622454 | 10.9 ppb |
| 2019-08-06 | 622456 | 12.3 ppb |
| 2019-08-06 | 622453 | 9.89 ppb |
| 2019-11-05 | 644387 | 14.4 ppb |
| 2019-11-05 | 644379 | 10.3 ppb |
| 2019-11-05 | 644378 | 10.4 ppb |
| 2019-11-05 | 644385 | 10.1 ppb |
| 2019-11-05 | 644382 | 11.7 ppb |
| 2019-11-05 | 644381 | 15.2 ppb |
| 2019-11-05 | 644383 | 13.7 ppb |
| 2019-11-05 | 644386 | 15.5 ppb |
| 2019-11-05 | 644380 | 14.0 ppb |
| 2019-11-05 | 644388 | 11.7 ppb |
| 2019-11-05 | 644384 | 10.2 ppb |
| 2019-11-05 | 644389 | 14.3 ppb |
| 2020-02-04 | 656186 | 9.96 ppb |
| 2020-02-04 | 656189 | 11.9 ppb |
| 2020-02-04 | 656190 | 10.6 ppb |
| 2020-02-04 | 656184 | 12.4 ppb |
| 2020-02-04 | 656185 | 10.8 ppb |
| 2020-02-04 | 656187 | 10.8 ppb |
| 2020-02-04 | 656182 | 11.5 ppb |
| 2020-02-04 | 656183 | 14.9 ppb |
| 2020-02-04 | 656193 | 9.94 ppb |
| 2020-02-04 | 656188 | 12.5 ppb |
| 2020-02-04 | 656191 | 13.1 ppb |
| 2020-02-04 | 656192 | 14.2 ppb |
| 2020-04-20 | 667072 | 13.2 ppb |
| 2020-04-20 | 667071 | 10.8 ppb |
| 2020-05-05 | 672108 | 13.9 ppb |
| 2020-05-05 | 672109 | 13.0 ppb |
| 2020-05-05 | 672103 | 13.3 ppb |
| 2020-05-05 | 672106 | 10.8 ppb |
| 2020-05-05 | 672102 | 13.3 ppb |
| 2020-05-05 | 672098 | 13.2 ppb |
| 2020-05-05 | 672107 | 13.8 ppb |
| 2020-05-05 | 672101 | 13.3 ppb |
| 2020-05-05 | 672105 | 10.2 ppb |
| 2020-05-05 | 672099 | 12.4 ppb |
| 2020-05-05 | 672100 | 13.5 ppb |
| 2020-05-05 | 672104 | 13.2 ppb |
| 2020-06-01 | 667076 | ND |
| 2020-06-01 | 667075 | ND |
| 2020-06-01 | 667073 | 1.66 ppb |
| 2020-06-01 | 667074 | ND |
| 2020-08-04 | 681798 | 16.2 ppb |
| 2020-08-04 | 681805 | 17.2 ppb |
| 2020-08-04 | 681796 | 16.4 ppb |
| 2020-08-04 | 681804 | 16.7 ppb |
| 2020-08-04 | 681799 | 16.9 ppb |
| 2020-08-04 | 681795 | 17.0 ppb |
| 2020-08-04 | 681800 | 16.7 ppb |
| 2020-08-04 | 681802 | 15.9 ppb |
| 2020-08-04 | 681801 | 15.7 ppb |
| 2020-08-04 | 681803 | 13.8 ppb |
| 2020-08-04 | 681806 | 16.1 ppb |
| 2020-08-04 | 681797 | 15.6 ppb |
| 2020-11-10 | 706880 | 18.1 ppb |
| 2020-11-10 | 706882 | 12.8 ppb |
| 2020-11-10 | 706889 | 16.2 ppb |
| 2020-11-10 | 706879 | 15.6 ppb |
| 2020-11-10 | 706881 | 12.7 ppb |
| 2020-11-10 | 706883 | 12.6 ppb |
| 2020-11-10 | 706886 | 19.2 ppb |
| 2020-11-10 | 706888 | 15.8 ppb |
| 2020-11-10 | 706878 | 16.3 ppb |
| 2020-11-10 | 706885 | 12.5 ppb |
| 2020-11-10 | 706887 | 13.9 ppb |
| 2020-11-10 | 706884 | 16.8 ppb |
| 2021-02-02 | 719024 | 10.2 ppb |
| 2021-02-02 | 719020 | 6.67 ppb |
| 2021-02-02 | 719019 | 6.22 ppb |
| 2021-02-02 | 719023 | 10.3 ppb |
| 2021-02-02 | 719022 | 9.15 ppb |
| 2021-02-02 | 719025 | 10.9 ppb |
| 2021-02-02 | 719026 | 6.78 ppb |
| 2021-02-02 | 719018 | 6.23 ppb |
| 2021-02-02 | 719017 | 10.6 ppb |
| 2021-02-02 | 719016 | 11.7 ppb |
| 2021-02-02 | 719015 | 6.28 ppb |
| 2021-02-02 | 719021 | 9.07 ppb |
| 2021-05-04 | 733031 | 10.7 ppb |
| 2021-05-04 | 733032 | 6.51 ppb |
| 2021-05-04 | 733028 | 6.88 ppb |
| 2021-05-04 | 733034 | 5.80 ppb |
| 2021-05-04 | 733033 | 6.79 ppb |
| 2021-05-04 | 733026 | 6.21 ppb |
| 2021-05-04 | 733029 | 10.1 ppb |
| 2021-05-04 | 733030 | 9.46 ppb |
| 2021-05-04 | 733027 | 10.5 ppb |
| 2021-05-04 | 733035 | 5.46 ppb |
| 2021-05-04 | 733036 | 4.96 ppb |
| 2021-05-04 | 733037 | 4.35 ppb |
| 2021-08-04 | 753576 | 11.2 ppb |
| 2021-08-04 | 753575 | 11.0 ppb |
| 2021-08-04 | 753580 | 10.5 ppb |
| 2021-08-04 | 753577 | 10.7 ppb |
| 2021-08-04 | 753570 | 10.4 ppb |
| 2021-08-04 | 753571 | 11.5 ppb |
| 2021-08-04 | 753581 | 10.3 ppb |
| 2021-08-04 | 753572 | 14.9 ppb |
| 2021-08-04 | 753578 | 11.7 ppb |
| 2021-08-04 | 753579 | 9.82 ppb |
| 2021-08-04 | 753574 | 10.6 ppb |
| 2021-08-04 | 753573 | 15.6 ppb |
| 2021-11-03 | 770901 | 13.0 ppb |
| 2021-11-03 | 770897 | 12.6 ppb |
| 2021-11-03 | 770898 | 12.7 ppb |
| 2021-11-03 | 770900 | 11.9 ppb |
| 2021-11-03 | 770890 | 10.7 ppb |
| 2021-11-03 | 770892 | 12.2 ppb |
| 2021-11-03 | 770899 | 12.6 ppb |
| 2021-11-03 | 770891 | 11.5 ppb |
| 2021-11-03 | 770894 | 11.4 ppb |
| 2021-11-03 | 770896 | 12.8 ppb |
| 2021-11-03 | 770893 | 11.9 ppb |
| 2021-11-03 | 770895 | 11.2 ppb |
| 2022-02-23 | 782425 | 9.53 ppb |
| 2022-02-23 | 782422 | 9.18 ppb |
| 2022-02-23 | 782428 | 10.7 ppb |
| 2022-02-23 | 782429 | 11.0 ppb |
| 2022-02-23 | 782420 | 8.99 ppb |
| 2022-02-23 | 782427 | 11.0 ppb |
| 2022-02-23 | 782421 | 7.76 ppb |
| 2022-02-23 | 782419 | 7.32 ppb |
| 2022-02-23 | 782423 | 9.21 ppb |
| 2022-02-23 | 782426 | 11.3 ppb |
| 2022-02-23 | 782418 | 8.79 ppb |
| 2022-02-23 | 782424 | 10.3 ppb |
| 2022-04-26 | 793153 | 9.49 ppb |
| 2022-05-03 | 800306 | 10.8 ppb |
| 2022-05-03 | 800313 | 8.59 ppb |
| 2022-05-03 | 800314 | 9.57 ppb |
| 2022-05-03 | 800312 | 8.66 ppb |
| 2022-05-03 | 800305 | 9.17 ppb |
| 2022-05-03 | 800307 | 11.0 ppb |
| 2022-05-03 | 800308 | 9.49 ppb |
| 2022-05-03 | 800309 | 10.1 ppb |
| 2022-05-03 | 800303 | 9.51 ppb |
| 2022-05-03 | 800311 | 9.47 ppb |
| 2022-05-03 | 800304 | 10.00 ppb |
| 2022-05-03 | 800310 | 10.4 ppb |
| 2022-08-03 | 815800 | 11.9 ppb |
| 2022-08-03 | 815794 | 13.9 ppb |
| 2022-08-03 | 815795 | 17.9 ppb |
| 2022-08-03 | 815797 | 13.2 ppb |
| 2022-08-03 | 815803 | 11.1 ppb |
| 2022-08-03 | 815804 | 12.9 ppb |
| 2022-08-03 | 815802 | 12.5 ppb |
| 2022-08-03 | 815801 | 12.1 ppb |
| 2022-08-03 | 815799 | 12.4 ppb |
| 2022-08-03 | 815796 | 16.0 ppb |
| 2022-08-03 | 815793 | 14.0 ppb |
| 2022-08-03 | 815798 | 12.4 ppb |
| 2022-11-08 | 833764 | 11.3 ppb |
| 2022-11-08 | 833766 | 8.74 ppb |
| 2022-11-08 | 833762 | 8.80 ppb |
| 2022-11-08 | 833755 | 10.8 ppb |
| 2022-11-08 | 833757 | 11.1 ppb |
| 2022-11-08 | 833758 | 11.2 ppb |
| 2022-11-08 | 833759 | 11.8 ppb |
| 2022-11-08 | 833760 | 9.09 ppb |
| 2022-11-08 | 833763 | 11.4 ppb |
| 2022-11-08 | 833765 | 12.1 ppb |
| 2022-11-08 | 833761 | 9.08 ppb |
| 2022-11-08 | 833756 | 11.6 ppb |
| 2023-01-17 | 844825 | ND |
| 2023-02-07 | 847425 | 10.4 ppb |
| 2023-02-07 | 847423 | 9.70 ppb |
| 2023-02-07 | 847424 | 9.08 ppb |
| 2023-02-07 | 847415 | 10.00 ppb |
| 2023-02-07 | 847421 | 10.2 ppb |
| 2023-02-07 | 847420 | 8.89 ppb |
| 2023-02-07 | 847418 | 9.99 ppb |
| 2023-02-07 | 847422 | 9.96 ppb |
| 2023-02-07 | 847414 | 11.4 ppb |
| 2023-02-07 | 847419 | 10.6 ppb |
| 2023-02-07 | 847416 | 10.5 ppb |
| 2023-02-07 | 847417 | 11.0 ppb |
| 2023-05-02 | 858550 | 8.66 ppb |
| 2023-05-02 | 858543 | 11.2 ppb |
| 2023-05-02 | 858549 | 9.08 ppb |
| 2023-05-02 | 858548 | 8.96 ppb |
| 2023-05-02 | 858542 | 9.56 ppb |
| 2023-05-02 | 858540 | 10.8 ppb |
| 2023-05-02 | 858539 | 8.52 ppb |
| 2023-05-02 | 858547 | 9.06 ppb |
| 2023-05-02 | 858545 | 11.5 ppb |
| 2023-05-02 | 858541 | 11.4 ppb |
| 2023-05-02 | 858546 | 8.92 ppb |
| 2023-05-02 | 858544 | 10.4 ppb |
| 2023-06-08 | 855997 | 3.90 ppb |
| 2023-06-08 | 855996 | 6.92 ppb |
| 2023-06-12 | 856264 | 17.3 ppb |
| 2023-06-12 | 856263 | 16.4 ppb |
| 2023-08-08 | 879877 | 15.0 ppb |
| 2023-08-08 | 879874 | 13.3 ppb |
| 2023-08-08 | 879878 | 25.7 ppb |
| 2023-08-08 | 879879 | 26.0 ppb |
| 2023-08-08 | 879880 | 15.6 ppb |
| 2023-08-08 | 879885 | 13.4 ppb |
| 2023-08-08 | 879876 | 14.7 ppb |
| 2023-08-08 | 879882 | 15.3 ppb |
| 2023-08-08 | 879875 | 15.6 ppb |
| 2023-08-08 | 879884 | 14.1 ppb |
| 2023-08-08 | 879883 | 26.5 ppb |
| 2023-08-08 | 879881 | 25.8 ppb |
| 2023-11-07 | 891421 | 13.4 ppb |
| 2023-11-07 | 891419 | 13.5 ppb |
| 2023-11-07 | 891420 | 12.4 ppb |
| 2023-11-07 | 891417 | 11.3 ppb |
| 2023-11-07 | 891424 | 13.6 ppb |
| 2023-11-07 | 891425 | 12.1 ppb |
| 2023-11-07 | 891423 | 10.9 ppb |
| 2023-11-07 | 891418 | 13.4 ppb |
| 2023-11-07 | 891427 | 13.4 ppb |
| 2023-11-07 | 891422 | 11.9 ppb |
| 2023-11-07 | 891428 | 11.0 ppb |
| 2023-11-07 | 891426 | 11.4 ppb |