Bromoform
Metropolitan Utilities District
Bromoform, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Bromoform 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 | 0.253 ppb | 50 | 17 | ND - 1.17 ppb |
| 2019 | 0.219 ppb | 51 | 14 | ND - 1.51 ppb |
| 2020 | 0.436 ppb | 54 | 31 | ND - 1.12 ppb |
| 2021 | 0.280 ppb | 48 | 19 | ND - 1.02 ppb |
| 2022 | 0.269 ppb | 49 | 16 | ND - 1.37 ppb |
| 2023 | 0.345 ppb | 53 | 25 | ND - 1.29 ppb |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform is 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, harm to reproduction and child development, and change to fetal growth and development .
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2018-02-06 | 534097 | 0.700 ppb |
| 2018-02-06 | 534092 | ND |
| 2018-02-06 | 534095 | 1.17 ppb |
| 2018-02-06 | 534100 | ND |
| 2018-02-06 | 534094 | ND |
| 2018-02-06 | 534090 | ND |
| 2018-02-06 | 534099 | 0.890 ppb |
| 2018-02-06 | 534096 | 1.12 ppb |
| 2018-02-06 | 534089 | 0.940 ppb |
| 2018-02-06 | 534098 | 0.790 ppb |
| 2018-02-06 | 534091 | ND |
| 2018-02-06 | 534093 | 0.680 ppb |
| 2018-05-07 | 549815 | 0.530 ppb |
| 2018-05-07 | 549816 | ND |
| 2018-05-07 | 549817 | 0.770 ppb |
| 2018-05-07 | 549814 | ND |
| 2018-05-07 | 549819 | 0.710 ppb |
| 2018-05-07 | 549825 | ND |
| 2018-05-07 | 549823 | ND |
| 2018-05-07 | 549821 | ND |
| 2018-05-07 | 549820 | ND |
| 2018-05-07 | 549818 | ND |
| 2018-05-07 | 549824 | ND |
| 2018-05-07 | 549822 | 0.640 ppb |
| 2018-05-14 | 542540 | ND |
| 2018-05-14 | 542539 | ND |
| 2018-08-08 | 567027 | ND |
| 2018-08-08 | 567023 | ND |
| 2018-08-08 | 567022 | ND |
| 2018-08-08 | 567029 | ND |
| 2018-08-08 | 567030 | ND |
| 2018-08-08 | 567024 | ND |
| 2018-08-08 | 567021 | 0.540 ppb |
| 2018-08-08 | 567026 | 0.680 ppb |
| 2018-08-08 | 567020 | ND |
| 2018-08-08 | 567028 | ND |
| 2018-08-08 | 567019 | ND |
| 2018-08-08 | 567025 | ND |
| 2018-11-06 | 583375 | ND |
| 2018-11-06 | 583385 | ND |
| 2018-11-06 | 583379 | ND |
| 2018-11-06 | 583374 | 0.732 ppb |
| 2018-11-06 | 583383 | ND |
| 2018-11-06 | 583378 | 0.620 ppb |
| 2018-11-06 | 583376 | 0.580 ppb |
| 2018-11-06 | 583382 | ND |
| 2018-11-06 | 583380 | 0.550 ppb |
| 2018-11-06 | 583384 | ND |
| 2018-11-06 | 583381 | ND |
| 2018-11-06 | 583377 | ND |
| 2019-02-05 | 595239 | 0.880 ppb |
| 2019-02-05 | 595245 | 0.880 ppb |
| 2019-02-05 | 595238 | ND |
| 2019-02-05 | 595243 | 0.880 ppb |
| 2019-02-05 | 595240 | ND |
| 2019-02-05 | 595237 | 0.746 ppb |
| 2019-02-05 | 595236 | 0.693 ppb |
| 2019-02-05 | 595244 | 0.900 ppb |
| 2019-02-05 | 595241 | 0.900 ppb |
| 2019-02-05 | 595246 | ND |
| 2019-02-05 | 595242 | ND |
| 2019-02-05 | 595247 | ND |
| 2019-04-02 | 604245 | ND |
| 2019-04-22 | 604810 | 1.51 ppb |
| 2019-05-07 | 600564 | ND |
| 2019-05-07 | 600571 | 0.860 ppb |
| 2019-05-07 | 600574 | ND |
| 2019-05-07 | 600567 | 0.690 ppb |
| 2019-05-07 | 600570 | ND |
| 2019-05-07 | 600566 | ND |
| 2019-05-07 | 600573 | ND |
| 2019-05-07 | 600575 | ND |
| 2019-05-07 | 600565 | ND |
| 2019-05-07 | 600568 | ND |
| 2019-05-07 | 600572 | ND |
| 2019-05-07 | 600569 | ND |
| 2019-06-10 | 604811 | ND |
| 2019-08-06 | 622452 | ND |
| 2019-08-06 | 622449 | ND |
| 2019-08-06 | 622450 | ND |
| 2019-08-06 | 622455 | ND |
| 2019-08-06 | 622457 | ND |
| 2019-08-06 | 622459 | ND |
| 2019-08-06 | 622448 | ND |
| 2019-08-06 | 622458 | ND |
| 2019-08-06 | 622451 | ND |
| 2019-08-06 | 622454 | ND |
| 2019-08-06 | 622456 | 0.640 ppb |
| 2019-08-06 | 622453 | ND |
| 2019-11-05 | 644387 | 0.510 ppb |
| 2019-11-05 | 644379 | ND |
| 2019-11-05 | 644378 | ND |
| 2019-11-05 | 644385 | ND |
| 2019-11-05 | 644382 | ND |
| 2019-11-05 | 644381 | 0.590 ppb |
| 2019-11-05 | 644383 | ND |
| 2019-11-05 | 644386 | ND |
| 2019-11-05 | 644380 | 0.510 ppb |
| 2019-11-05 | 644388 | ND |
| 2019-11-05 | 644384 | ND |
| 2019-11-05 | 644389 | ND |
| 2020-02-04 | 656186 | ND |
| 2020-02-04 | 656189 | 0.700 ppb |
| 2020-02-04 | 656190 | ND |
| 2020-02-04 | 656184 | ND |
| 2020-02-04 | 656185 | ND |
| 2020-02-04 | 656187 | ND |
| 2020-02-04 | 656182 | ND |
| 2020-02-04 | 656183 | 1.12 ppb |
| 2020-02-04 | 656193 | ND |
| 2020-02-04 | 656188 | 0.770 ppb |
| 2020-02-04 | 656191 | 0.700 ppb |
| 2020-02-04 | 656192 | 0.750 ppb |
| 2020-04-20 | 667072 | ND |
| 2020-04-20 | 667071 | 0.540 ppb |
| 2020-05-05 | 672108 | 0.880 ppb |
| 2020-05-05 | 672109 | 0.710 ppb |
| 2020-05-05 | 672103 | 0.870 ppb |
| 2020-05-05 | 672106 | 0.560 ppb |
| 2020-05-05 | 672102 | 0.990 ppb |
| 2020-05-05 | 672098 | ND |
| 2020-05-05 | 672107 | ND |
| 2020-05-05 | 672101 | 0.800 ppb |
| 2020-05-05 | 672105 | 0.530 ppb |
| 2020-05-05 | 672099 | ND |
| 2020-05-05 | 672100 | ND |
| 2020-05-05 | 672104 | ND |
| 2020-06-01 | 667076 | ND |
| 2020-06-01 | 667075 | ND |
| 2020-06-01 | 667073 | ND |
| 2020-06-01 | 667074 | ND |
| 2020-08-04 | 681798 | ND |
| 2020-08-04 | 681805 | 0.670 ppb |
| 2020-08-04 | 681796 | 0.640 ppb |
| 2020-08-04 | 681804 | 0.620 ppb |
| 2020-08-04 | 681799 | 0.720 ppb |
| 2020-08-04 | 681795 | ND |
| 2020-08-04 | 681800 | 0.690 ppb |
| 2020-08-04 | 681802 | 0.700 ppb |
| 2020-08-04 | 681801 | 1.05 ppb |
| 2020-08-04 | 681803 | 0.590 ppb |
| 2020-08-04 | 681806 | 0.560 ppb |
| 2020-08-04 | 681797 | 0.560 ppb |
| 2020-11-10 | 706880 | ND |
| 2020-11-10 | 706882 | 0.690 ppb |
| 2020-11-10 | 706889 | 0.870 ppb |
| 2020-11-10 | 706879 | 0.830 ppb |
| 2020-11-10 | 706881 | ND |
| 2020-11-10 | 706883 | 0.660 ppb |
| 2020-11-10 | 706886 | 0.850 ppb |
| 2020-11-10 | 706888 | 0.980 ppb |
| 2020-11-10 | 706878 | 0.920 ppb |
| 2020-11-10 | 706885 | ND |
| 2020-11-10 | 706887 | ND |
| 2020-11-10 | 706884 | 1.03 ppb |
| 2021-02-02 | 719024 | 0.530 ppb |
| 2021-02-02 | 719020 | ND |
| 2021-02-02 | 719019 | ND |
| 2021-02-02 | 719023 | 0.560 ppb |
| 2021-02-02 | 719022 | 0.870 ppb |
| 2021-02-02 | 719025 | 0.620 ppb |
| 2021-02-02 | 719026 | ND |
| 2021-02-02 | 719018 | ND |
| 2021-02-02 | 719017 | 0.660 ppb |
| 2021-02-02 | 719016 | 0.740 ppb |
| 2021-02-02 | 719015 | ND |
| 2021-02-02 | 719021 | 0.800 ppb |
| 2021-05-04 | 733031 | 0.570 ppb |
| 2021-05-04 | 733032 | ND |
| 2021-05-04 | 733028 | ND |
| 2021-05-04 | 733034 | ND |
| 2021-05-04 | 733033 | ND |
| 2021-05-04 | 733026 | ND |
| 2021-05-04 | 733029 | ND |
| 2021-05-04 | 733030 | 0.530 ppb |
| 2021-05-04 | 733027 | ND |
| 2021-05-04 | 733035 | ND |
| 2021-05-04 | 733036 | ND |
| 2021-05-04 | 733037 | ND |
| 2021-08-04 | 753576 | ND |
| 2021-08-04 | 753575 | ND |
| 2021-08-04 | 753580 | ND |
| 2021-08-04 | 753577 | ND |
| 2021-08-04 | 753570 | ND |
| 2021-08-04 | 753571 | ND |
| 2021-08-04 | 753581 | ND |
| 2021-08-04 | 753572 | 1.02 ppb |
| 2021-08-04 | 753578 | 0.540 ppb |
| 2021-08-04 | 753579 | ND |
| 2021-08-04 | 753574 | ND |
| 2021-08-04 | 753573 | 0.950 ppb |
| 2021-11-03 | 770901 | 0.780 ppb |
| 2021-11-03 | 770897 | 0.770 ppb |
| 2021-11-03 | 770898 | 0.740 ppb |
| 2021-11-03 | 770900 | 0.790 ppb |
| 2021-11-03 | 770890 | ND |
| 2021-11-03 | 770892 | ND |
| 2021-11-03 | 770899 | 0.760 ppb |
| 2021-11-03 | 770891 | ND |
| 2021-11-03 | 770894 | ND |
| 2021-11-03 | 770896 | 0.680 ppb |
| 2021-11-03 | 770893 | 0.520 ppb |
| 2021-11-03 | 770895 | ND |
| 2022-02-23 | 782425 | ND |
| 2022-02-23 | 782422 | ND |
| 2022-02-23 | 782428 | 0.650 ppb |
| 2022-02-23 | 782429 | 0.690 ppb |
| 2022-02-23 | 782420 | ND |
| 2022-02-23 | 782427 | 0.750 ppb |
| 2022-02-23 | 782421 | ND |
| 2022-02-23 | 782419 | ND |
| 2022-02-23 | 782423 | ND |
| 2022-02-23 | 782426 | 0.720 ppb |
| 2022-02-23 | 782418 | ND |
| 2022-02-23 | 782424 | 0.680 ppb |
| 2022-04-26 | 793153 | 0.850 ppb |
| 2022-05-03 | 800306 | 0.730 ppb |
| 2022-05-03 | 800313 | 1.12 ppb |
| 2022-05-03 | 800314 | ND |
| 2022-05-03 | 800312 | 1.09 ppb |
| 2022-05-03 | 800305 | ND |
| 2022-05-03 | 800307 | 0.790 ppb |
| 2022-05-03 | 800308 | ND |
| 2022-05-03 | 800309 | 0.560 ppb |
| 2022-05-03 | 800303 | ND |
| 2022-05-03 | 800311 | ND |
| 2022-05-03 | 800304 | ND |
| 2022-05-03 | 800310 | 0.560 ppb |
| 2022-08-03 | 815800 | ND |
| 2022-08-03 | 815794 | ND |
| 2022-08-03 | 815795 | 0.780 ppb |
| 2022-08-03 | 815797 | ND |
| 2022-08-03 | 815803 | ND |
| 2022-08-03 | 815804 | ND |
| 2022-08-03 | 815802 | ND |
| 2022-08-03 | 815801 | ND |
| 2022-08-03 | 815799 | ND |
| 2022-08-03 | 815796 | 0.580 ppb |
| 2022-08-03 | 815793 | ND |
| 2022-08-03 | 815798 | ND |
| 2022-11-08 | 833764 | 1.37 ppb |
| 2022-11-08 | 833766 | ND |
| 2022-11-08 | 833762 | ND |
| 2022-11-08 | 833755 | ND |
| 2022-11-08 | 833757 | ND |
| 2022-11-08 | 833758 | ND |
| 2022-11-08 | 833759 | ND |
| 2022-11-08 | 833760 | ND |
| 2022-11-08 | 833763 | ND |
| 2022-11-08 | 833765 | 1.25 ppb |
| 2022-11-08 | 833761 | ND |
| 2022-11-08 | 833756 | ND |
| 2023-01-17 | 844825 | ND |
| 2023-02-07 | 847425 | ND |
| 2023-02-07 | 847423 | ND |
| 2023-02-07 | 847424 | 0.600 ppb |
| 2023-02-07 | 847415 | ND |
| 2023-02-07 | 847421 | ND |
| 2023-02-07 | 847420 | 0.580 ppb |
| 2023-02-07 | 847418 | ND |
| 2023-02-07 | 847422 | ND |
| 2023-02-07 | 847414 | ND |
| 2023-02-07 | 847419 | ND |
| 2023-02-07 | 847416 | ND |
| 2023-02-07 | 847417 | ND |
| 2023-05-02 | 858550 | 0.680 ppb |
| 2023-05-02 | 858543 | ND |
| 2023-05-02 | 858549 | 0.730 ppb |
| 2023-05-02 | 858548 | 0.710 ppb |
| 2023-05-02 | 858542 | 0.660 ppb |
| 2023-05-02 | 858540 | ND |
| 2023-05-02 | 858539 | 0.650 ppb |
| 2023-05-02 | 858547 | 0.700 ppb |
| 2023-05-02 | 858545 | ND |
| 2023-05-02 | 858541 | ND |
| 2023-05-02 | 858546 | 0.690 ppb |
| 2023-05-02 | 858544 | ND |
| 2023-06-08 | 855997 | ND |
| 2023-06-08 | 855996 | ND |
| 2023-06-12 | 856264 | ND |
| 2023-06-12 | 856263 | ND |
| 2023-08-08 | 879877 | 0.510 ppb |
| 2023-08-08 | 879874 | 0.580 ppb |
| 2023-08-08 | 879878 | 1.07 ppb |
| 2023-08-08 | 879879 | 1.06 ppb |
| 2023-08-08 | 879880 | 0.640 ppb |
| 2023-08-08 | 879885 | 0.540 ppb |
| 2023-08-08 | 879876 | ND |
| 2023-08-08 | 879882 | 0.620 ppb |
| 2023-08-08 | 879875 | 0.620 ppb |
| 2023-08-08 | 879884 | 0.570 ppb |
| 2023-08-08 | 879883 | 1.29 ppb |
| 2023-08-08 | 879881 | 1.03 ppb |
| 2023-11-07 | 891421 | 0.800 ppb |
| 2023-11-07 | 891419 | 0.870 ppb |
| 2023-11-07 | 891420 | 0.690 ppb |
| 2023-11-07 | 891417 | ND |
| 2023-11-07 | 891424 | ND |
| 2023-11-07 | 891425 | 0.540 ppb |
| 2023-11-07 | 891423 | ND |
| 2023-11-07 | 891418 | 0.870 ppb |
| 2023-11-07 | 891427 | ND |
| 2023-11-07 | 891422 | ND |
| 2023-11-07 | 891428 | ND |
| 2023-11-07 | 891426 | ND |