Dibromochloromethane
Rocky Mount, Town of
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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 | 0.691 ppb | 10 | 10 | 0.420 ppb - 0.980 ppb |
| 2019 | 0.686 ppb | 8 | 8 | 0.250 ppb - 1.03 ppb |
| 2020 | 0.414 ppb | 9 | 5 | ND - 1.000 ppb |
| 2021 | 0.190 ppb | 8 | 2 | ND - 1.000 ppb |
| 2022 | ND | 8 | 0 | ND |
| 2023 | ND | 8 | 0 | ND |
ppb = parts per billion
State, National, and Health Guidelines for Drinking Water
EWG Health Guideline: 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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 |
|---|---|---|
| 2018-02-13 | 18021754-06A | 0.450 ppb |
| 2018-02-13 | 18021754-04A | 0.540 ppb |
| 2018-05-09 | 18051655-03A | 0.980 ppb |
| 2018-05-09 | 18051655-05A | 0.960 ppb |
| 2018-08-07 | 18081653-04A | 0.720 ppb |
| 2018-08-07 | 18081653-06A | 0.760 ppb |
| 2018-08-29 | 18084316-01A | 0.790 ppb |
| 2018-08-29 | 18084316-03A | 0.840 ppb |
| 2018-11-07 | 18111281-01A | 0.420 ppb |
| 2018-11-07 | 18111281-03A | 0.450 ppb |
| 2019-02-11 | 19021456-04A | 0.250 ppb |
| 2019-02-11 | 19021456-06A | 0.420 ppb |
| 2019-05-07 | 19051103-03A | 0.750 ppb |
| 2019-05-07 | 19051103-04A | 0.940 ppb |
| 2019-08-05 | 19080727-04A | 0.781 ppb |
| 2019-08-05 | 19080727-06A | 1.03 ppb |
| 2019-11-18 | 738749004 | 0.720 ppb |
| 2019-11-18 | 738749006 | 0.600 ppb |
| 2020-02-10 | 7317523004-TTHM | 0.610 ppb |
| 2020-02-10 | 7317523003-TTHM | ND |
| 2020-02-24 | 7319002002 | ND |
| 2020-05-11 | 7327370004 | 0.570 ppb |
| 2020-05-11 | 732737003 | 0.770 ppb |
| 2020-08-10 | 7338274006 | 1.000 ppb |
| 2020-08-10 | 7338274004 | 0.780 ppb |
| 2020-11-09 | 7349740006_460165 | ND |
| 2020-11-09 | 7349740004_460165 | ND |
| 2021-02-08 | 7359716004_460165 | ND |
| 2021-02-08 | 7359716003_460165 | ND |
| 2021-05-10 | 7370870003_460165 | ND |
| 2021-05-10 | 7370870005_460165 | ND |
| 2021-08-11 | 7384218006_460165 | 1.000 ppb |
| 2021-08-11 | 7384218004_460165 | ND |
| 2021-11-10 | 810-8267-4 | ND |
| 2021-11-10 | 810-8267-2 | 0.520 ppb |
| 2022-02-21 | 2025210-04 | ND |
| 2022-02-21 | 2025210-02 | ND |
| 2022-05-11 | 2054055-01 | ND |
| 2022-05-11 | 2054055-03 | ND |
| 2022-08-10 | 2084897-02 | ND |
| 2022-08-10 | 2084897-04 | ND |
| 2022-11-09 | 2113916-01 | ND |
| 2022-11-09 | 2113916-03 | ND |
| 2023-02-08 | 3023686-01 | ND |
| 2023-02-08 | 3023686-03 | ND |
| 2023-05-10 | 3053983-0B | ND |
| 2023-05-10 | 3053983-0D | ND |
| 2023-08-09 | 3084072-01 | ND |
| 2023-08-09 | 3084072-03 | ND |
| 2023-11-08 | 3113719-01 | ND |
| 2023-11-08 | 3113719-04 | ND |