Bromoform
El Monte Water Department
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.
128
Samples
0
Samples exceeding legal limit (MCL)
12
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2018 | 0.894 ppb | 16 | 4 | ND - 5.10 ppb |
| 2019 | ND | 16 | 0 | ND |
| 2020 | ND | 16 | 0 | ND |
| 2021 | 0.0650 ppb | 20 | 1 | ND - 1.30 ppb |
| 2022 | 0.0213 ppb | 32 | 1 | ND - 0.680 ppb |
| 2023 | 0.223 ppb | 28 | 6 | ND - 1.20 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 |
|---|---|---|
| 2018-01-25 | CA1910038_DST_800-201801251145 | ND |
| 2018-01-25 | CA1910038_DST_801-201801250950 | ND |
| 2018-01-25 | CA1910038_DST_802-201801251115 | ND |
| 2018-01-25 | CA1910038_DST_803-201801251000 | ND |
| 2018-04-30 | CA1910038_DST_802-201804301335 | 4.40 ppb |
| 2018-04-30 | CA1910038_DST_800-201804301345 | ND |
| 2018-04-30 | CA1910038_DST_801-201804301310 | 1.30 ppb |
| 2018-04-30 | CA1910038_DST_803-201804301320 | 5.10 ppb |
| 2018-07-25 | CA1910038_DST_802-201807251350 | ND |
| 2018-07-25 | CA1910038_DST_800-201807251435 | ND |
| 2018-07-25 | CA1910038_DST_801-201807251235 | ND |
| 2018-07-25 | CA1910038_DST_803-201807251240 | ND |
| 2018-10-31 | CA1910038_DST_800-201810311125 | ND |
| 2018-10-31 | CA1910038_DST_802-201810311100 | ND |
| 2018-10-31 | CA1910038_DST_803-201810310955 | 3.50 ppb |
| 2018-10-31 | CA1910038_DST_801-201810310945 | ND |
| 2019-01-31 | CA1910038_DST_800-201901311100 | ND |
| 2019-01-31 | CA1910038_DST_801-201901310915 | ND |
| 2019-01-31 | CA1910038_DST_803-201901310925 | ND |
| 2019-01-31 | CA1910038_DST_802-201901311040 | ND |
| 2019-04-25 | CA1910038_DST_801-201904251240 | ND |
| 2019-04-25 | CA1910038_DST_800-201904251335 | ND |
| 2019-04-25 | CA1910038_DST_802-201904251315 | ND |
| 2019-04-25 | CA1910038_DST_803-201904251230 | ND |
| 2019-07-25 | CA1910038_DST_800-201907251550 | ND |
| 2019-07-25 | CA1910038_DST_802-201907251520 | ND |
| 2019-07-25 | CA1910038_DST_801-201907251335 | ND |
| 2019-07-25 | CA1910038_DST_803-201907251330 | ND |
| 2019-10-30 | CA1910038_DST_802-201910301415 | ND |
| 2019-10-30 | CA1910038_DST_803-201910301310 | ND |
| 2019-10-30 | CA1910038_DST_800-201910301435 | ND |
| 2019-10-30 | CA1910038_DST_801-201910301320 | ND |
| 2020-01-30 | CA1910038_DST_800-202001301310 | ND |
| 2020-01-30 | CA1910038_DST_802-202001301300 | ND |
| 2020-01-30 | CA1910038_DST_803-202001301250 | ND |
| 2020-01-30 | CA1910038_DST_801-202001301240 | ND |
| 2020-04-29 | CA1910038_DST_802-202004291200 | ND |
| 2020-04-29 | CA1910038_DST_800-202004291230 | ND |
| 2020-04-29 | CA1910038_DST_803-202004291210 | ND |
| 2020-04-29 | CA1910038_DST_801-202004291215 | ND |
| 2020-07-29 | CA1910038_DST_800-202007291430 | ND |
| 2020-07-29 | CA1910038_DST_801-202007291400 | ND |
| 2020-07-29 | CA1910038_DST_803-202007291350 | ND |
| 2020-07-29 | CA1910038_DST_802-202007291415 | ND |
| 2020-10-30 | CA1910038_DST_800-202010301410 | ND |
| 2020-10-30 | CA1910038_DST_803-202010301340 | ND |
| 2020-10-30 | CA1910038_DST_801-202010301350 | ND |
| 2020-10-30 | CA1910038_DST_802-202010301400 | ND |
| 2021-01-26 | CA1910038_DST_800-202101261415 | ND |
| 2021-01-26 | CA1910038_DST_802-202101261405 | ND |
| 2021-01-26 | CA1910038_DST_801-202101261340 | ND |
| 2021-01-26 | CA1910038_DST_803-202101261350 | ND |
| 2021-04-28 | CA1910038_DST_800-202104281200 | ND |
| 2021-04-28 | CA1910038_DST_802-202104281135 | ND |
| 2021-04-28 | CA1910038_DST_803-202104281020 | ND |
| 2021-04-28 | CA1910038_DST_801-202104281030 | ND |
| 2021-07-28 | CA1910038_DST_800-202107281320 | ND |
| 2021-07-28 | CA1910038_DST_801-202107281255 | ND |
| 2021-07-28 | CA1910038_DST_803-202107281240 | ND |
| 2021-07-28 | CA1910038_DST_802-202107281310 | 1.30 ppb |
| 2021-10-28 | CA1910038_DST_802-202110281350 | ND |
| 2021-10-28 | CA1910038_DST_803-202110281325 | ND |
| 2021-10-28 | CA1910038_DST_800-202110281405 | ND |
| 2021-10-28 | CA1910038_DST_801-202110281335 | ND |
| 2021-12-06 | CA1910038_DST_803-202112061135 | ND |
| 2021-12-06 | CA1910038_DST_800-202112061035 | ND |
| 2021-12-06 | CA1910038_DST_801-202112061205 | ND |
| 2021-12-06 | CA1910038_DST_802-202112061325 | ND |
| 2022-01-27 | CA1910038_DST_800-202201270800 | ND |
| 2022-01-27 | CA1910038_DST_801-202201270810 | ND |
| 2022-01-27 | CA1910038_DST_802-202201270745 | ND |
| 2022-01-27 | CA1910038_DST_803-202201270820 | ND |
| 2022-03-01 | CA1910038_DST_803-202203011015 | ND |
| 2022-03-01 | CA1910038_DST_801-202203011005 | ND |
| 2022-03-01 | CA1910038_DST_802-202203010905 | ND |
| 2022-03-01 | CA1910038_DST_800-202203010925 | ND |
| 2022-04-27 | CA1910038_DST_801-202204270900 | ND |
| 2022-04-27 | CA1910038_DST_802-202204270830 | ND |
| 2022-04-27 | CA1910038_DST_803-202204270845 | ND |
| 2022-04-27 | CA1910038_DST_800-202204270820 | ND |
| 2022-06-07 | CA1910038_DST_800-202206071230 | ND |
| 2022-06-07 | CA1910038_DST_801-202206070820 | ND |
| 2022-06-07 | CA1910038_DST_803-202206070915 | ND |
| 2022-06-07 | CA1910038_DST_802-202206071120 | ND |
| 2022-07-26 | CA1910038_DST_800-202207261340 | ND |
| 2022-07-26 | CA1910038_DST_801-202207261320 | ND |
| 2022-07-26 | CA1910038_DST_803-202207261310 | ND |
| 2022-07-26 | CA1910038_DST_802-202207261355 | ND |
| 2022-09-06 | CA1910038_DST_801-202209061125 | ND |
| 2022-09-06 | CA1910038_DST_803-202209061105 | ND |
| 2022-09-06 | CA1910038_DST_800-202209061045 | ND |
| 2022-09-06 | CA1910038_DST_802-202209061025 | ND |
| 2022-10-31 | CA1910038_DST_800-202210311330 | ND |
| 2022-10-31 | CA1910038_DST_801-202210311305 | ND |
| 2022-10-31 | CA1910038_DST_802-202210311320 | ND |
| 2022-10-31 | CA1910038_DST_803-202210311255 | ND |
| 2022-12-05 | CA1910038_DST_803-202212051245 | ND |
| 2022-12-05 | CA1910038_DST_800-202212051145 | 0.680 ppb |
| 2022-12-05 | CA1910038_DST_801-202212050900 | ND |
| 2022-12-05 | CA1910038_DST_802-202212051110 | ND |
| 2023-01-31 | CA1910038_DST_802-202301311050 | ND |
| 2023-01-31 | CA1910038_DST_801-202301311040 | ND |
| 2023-01-31 | CA1910038_DST_800-202301311100 | ND |
| 2023-01-31 | CA1910038_DST_803-202301311030 | ND |
| 2023-03-06 | CA1910038_DST_802-202303060955 | ND |
| 2023-03-06 | CA1910038_DST_800-202303061008 | ND |
| 2023-03-06 | CA1910038_DST_801-202303060846 | ND |
| 2023-03-06 | CA1910038_DST_803-202303060902 | ND |
| 2023-04-24 | CA1910038_DST_801-202304241310 | 1.20 ppb |
| 2023-04-24 | CA1910038_DST_803-202304241255 | ND |
| 2023-04-24 | CA1910038_DST_800-202304241355 | 1.10 ppb |
| 2023-04-24 | CA1910038_DST_802-202304241335 | 1.20 ppb |
| 2023-06-06 | CA1910038_DST_801-202306061020 | ND |
| 2023-06-06 | CA1910038_DST_800-202306060955 | ND |
| 2023-06-06 | CA1910038_DST_802-202306060825 | ND |
| 2023-06-06 | CA1910038_DST_803-202306061050 | ND |
| 2023-07-31 | CA1910038_DST_800-202307311400 | 1.10 ppb |
| 2023-07-31 | CA1910038_DST_801-202307311320 | ND |
| 2023-07-31 | CA1910038_DST_802-202307311345 | 1.10 ppb |
| 2023-07-31 | CA1910038_DST_803-202307311330 | ND |
| 2023-09-05 | CA1910038_DST_803-202309050905 | 0.540 ppb |
| 2023-09-05 | CA1910038_DST_802-202309050929 | ND |
| 2023-09-05 | CA1910038_DST_801-202309050815 | ND |
| 2023-09-05 | CA1910038_DST_800-202309050753 | ND |
| 2023-10-31 | CA1910038_DST_801-202310311325 | ND |
| 2023-10-31 | CA1910038_DST_803-202310311315 | ND |
| 2023-10-31 | CA1910038_DST_800-202310311350 | ND |
| 2023-10-31 | CA1910038_DST_802-202310311335 | ND |