Bromoform
North Wales Water Authority
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 | 0.177 ppb | 35 | 7 | ND - 1.86 ppb |
| 2019 | 0.178 ppb | 36 | 9 | ND - 1.70 ppb |
| 2020 | 0.0637 ppb | 38 | 2 | ND - 1.80 ppb |
| 2021 | ND | 36 | 0 | ND |
| 2022 | 0.0718 ppb | 40 | 4 | ND - 0.989 ppb |
| 2023 | 0.0608 ppb | 40 | 2 | ND - 1.33 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 |
|---|---|---|
| 2018-02-12 | 20180597 | ND |
| 2018-02-12 | 20180598 | ND |
| 2018-02-12 | 20180599 | ND |
| 2018-02-12 | 20180600 | ND |
| 2018-02-12 | 20180601 | ND |
| 2018-02-12 | 20180602 | ND |
| 2018-02-12 | 20180603 | ND |
| 2018-02-12 | 20180604 | ND |
| 2018-03-13 | 20180956 | ND |
| 2018-05-14 | 20181890 | ND |
| 2018-05-14 | 20181891 | 0.537 ppb |
| 2018-05-14 | 20181892 | ND |
| 2018-05-14 | 20181893 | ND |
| 2018-05-14 | 20181894 | ND |
| 2018-05-14 | 20181895 | 0.506 ppb |
| 2018-05-14 | 20181896 | ND |
| 2018-05-14 | 20181897 | ND |
| 2018-06-05 | 20182148 | ND |
| 2018-08-13 | 20183097 | 0.726 ppb |
| 2018-08-13 | 20183098 | 0.770 ppb |
| 2018-08-13 | 20183099 | ND |
| 2018-08-13 | 20183100 | ND |
| 2018-08-13 | 20183101 | 0.710 ppb |
| 2018-08-13 | 20183102 | 1.86 ppb |
| 2018-08-13 | 20183103 | 1.08 ppb |
| 2018-08-13 | 20183104 | ND |
| 2018-09-04 | 20183373 | ND |
| 2018-11-12 | 8113026-01 | ND |
| 2018-11-12 | 8113026-02 | ND |
| 2018-11-12 | 8113026-03 | ND |
| 2018-11-12 | 8113026-04 | ND |
| 2018-11-12 | 8113026-05 | ND |
| 2018-11-12 | 8113026-06 | ND |
| 2018-11-12 | 8113026-07 | ND |
| 2018-11-12 | 8113026-08 | ND |
| 2019-02-11 | 20190552 | ND |
| 2019-02-11 | 20190553 | ND |
| 2019-02-11 | 20190554 | ND |
| 2019-02-11 | 20190555 | ND |
| 2019-02-11 | 20190556 | ND |
| 2019-02-11 | 20190557 | ND |
| 2019-02-11 | 20190558 | ND |
| 2019-02-11 | 20190559 | ND |
| 2019-03-05 | 20190857 | ND |
| 2019-05-13 | 20191796 | ND |
| 2019-05-13 | 20191797 | 0.507 ppb |
| 2019-05-13 | 20191798 | ND |
| 2019-05-13 | 20191799 | ND |
| 2019-05-13 | 20191800 | ND |
| 2019-05-13 | 20191801 | 0.529 ppb |
| 2019-05-13 | 20191802 | 0.522 ppb |
| 2019-05-13 | 20191803 | ND |
| 2019-08-13 | 9083732-01 | ND |
| 2019-08-13 | 9083732-02 | ND |
| 2019-08-13 | 9083732-03 | ND |
| 2019-08-13 | 9083732-04 | ND |
| 2019-08-13 | 9083732-05 | ND |
| 2019-08-13 | 9083732-06 | 1.70 ppb |
| 2019-08-13 | 9083732-07RE | ND |
| 2019-08-13 | 9083732-08 | ND |
| 2019-09-03 | 20193443 | ND |
| 2019-11-11 | 9113440-01 | ND |
| 2019-11-11 | 20194418 | 0.537 ppb |
| 2019-11-11 | 20194419 | 0.540 ppb |
| 2019-11-11 | 20194420 | ND |
| 2019-11-11 | 20194422 | 0.513 ppb |
| 2019-11-11 | 20194423 | 0.866 ppb |
| 2019-11-11 | 20194424 | 0.680 ppb |
| 2019-11-11 | 20194425 | ND |
| 2019-12-03 | 9121679-01 | ND |
| 2019-12-03 | 20194748 | ND |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-02-10 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-05-11 | ND | |
| 2020-06-02 | 22418615.00 | ND |
| 2020-06-02 | ND | |
| 2020-08-10 | ND | |
| 2020-08-10 | ND | |
| 2020-08-10 | ND | |
| 2020-08-10 | ND | |
| 2020-08-10 | ND | |
| 2020-08-10 | 1.80 ppb | |
| 2020-08-10 | ND | |
| 2020-08-10 | ND | |
| 2020-09-01 | 23001549.00 | ND |
| 2020-09-01 | ND | |
| 2020-11-11 | ND | |
| 2020-11-11 | ND | |
| 2020-11-11 | ND | |
| 2020-11-11 | ND | |
| 2020-11-11 | ND | |
| 2020-11-11 | 0.622 ppb | |
| 2020-11-11 | ND | |
| 2020-11-11 | ND | |
| 2020-12-01 | 23539423.00 | ND |
| 2020-12-01 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-02-10 | ND | |
| 2021-03-02 | 24062429.00 | ND |
| 2021-03-02 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-05-12 | ND | |
| 2021-06-01 | 24640242.00 | ND |
| 2021-06-01 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-08-11 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2021-11-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-02-10 | ND | |
| 2022-03-01 | 26289345.00 | ND |
| 2022-03-01 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-05-11 | ND | |
| 2022-06-07 | 26844674.00 | ND |
| 2022-06-07 | ND | |
| 2022-08-10 | 0.526 ppb | |
| 2022-08-10 | 0.543 ppb | |
| 2022-08-10 | ND | |
| 2022-08-10 | ND | |
| 2022-08-10 | ND | |
| 2022-08-10 | 0.989 ppb | |
| 2022-08-10 | 0.815 ppb | |
| 2022-08-10 | ND | |
| 2022-09-20 | 27443466.00 | ND |
| 2022-09-20 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-11-09 | ND | |
| 2022-12-06 | 28000372.00 | ND |
| 2022-12-06 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-02-08 | ND | |
| 2023-03-07 | 28523024.00 | ND |
| 2023-03-07 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-05-10 | ND | |
| 2023-06-19 | 29110369.00 | ND |
| 2023-06-19 | ND | |
| 2023-08-09 | ND | |
| 2023-08-09 | ND | |
| 2023-08-09 | ND | |
| 2023-08-09 | ND | |
| 2023-08-09 | ND | |
| 2023-08-09 | 1.33 ppb | |
| 2023-08-09 | ND | |
| 2023-08-09 | ND | |
| 2023-09-12 | 29701920.00 | ND |
| 2023-09-12 | ND | |
| 2023-11-09 | ND | |
| 2023-11-09 | ND | |
| 2023-11-09 | ND | |
| 2023-11-09 | ND | |
| 2023-11-09 | ND | |
| 2023-11-09 | 1.10 ppb | |
| 2023-11-09 | ND | |
| 2023-11-09 | ND | |
| 2023-11-17 | 30073322.00 | ND |
| 2023-11-17 | ND |