Bromoform
Crescent Water Supply
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 |
|---|---|---|---|---|
| 2014 | 0.443 ppb | 8 | 4 | ND - 1.07 ppb |
| 2015 | 0.223 ppb | 8 | 2 | ND - 0.930 ppb |
| 2016 | 0.225 ppb | 8 | 3 | ND - 0.730 ppb |
| 2017 | 0.509 ppb | 8 | 5 | ND - 0.970 ppb |
| 2018 | 0.504 ppb | 8 | 7 | ND - 1.01 ppb |
| 2019 | 0.376 ppb | 8 | 4 | ND - 1.07 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.5 ppb
The EWG Health Guideline of 0.5 ppb for bromoform was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-01-15 | 2029449 | 0.760 ppb |
| 2014-01-15 | 2029450 | 0.650 ppb |
| 2014-04-16 | 2047127 | ND |
| 2014-04-16 | 2047128 | ND |
| 2014-07-29 | 2068354 | 1.06 ppb |
| 2014-07-29 | 2068355 | 1.07 ppb |
| 2014-10-22 | 2088168 | ND |
| 2014-10-22 | 2088167 | ND |
| 2015-02-04 | 1B50271-01 | ND |
| 2015-02-04 | 1B50271-02 | ND |
| 2015-04-15 | 1D51157-01 | ND |
| 2015-04-15 | 1D51157-02 | ND |
| 2015-07-21 | 1G51663-01 | ND |
| 2015-07-21 | 1G51663-02 | ND |
| 2015-10-21 | 1J51655-02 | 0.930 ppb |
| 2015-10-21 | 1J51655-01 | 0.850 ppb |
| 2016-01-28 | 1A61840-01 | ND |
| 2016-01-28 | 1A61840-02 | ND |
| 2016-04-19 | 1D61454-01 | 0.730 ppb |
| 2016-04-19 | 1D61454-02 | 0.530 ppb |
| 2016-07-18 | 1G61327-01 | ND |
| 2016-07-18 | 1G61327-02 | 0.540 ppb |
| 2016-10-19 | 1J61511-01 | ND |
| 2016-10-19 | 1J61511-02 | ND |
| 2017-01-18 | 1A71156-01 | ND |
| 2017-01-18 | 1A71156-02 | 0.530 ppb |
| 2017-04-19 | 1D71499-01 | ND |
| 2017-04-19 | 1D71499-02 | ND |
| 2017-07-19 | 1G71485-01 | 0.910 ppb |
| 2017-07-19 | 1G71485-02 | 0.970 ppb |
| 2017-10-16 | 1J71518-01 | 0.920 ppb |
| 2017-10-16 | 1J71518-02 | 0.740 ppb |
| 2018-01-17 | 1A81192-02 | 0.650 ppb |
| 2018-01-17 | 1A81192-01 | 1.01 ppb |
| 2018-04-16 | 1D81273-01 | 0.390 ppb |
| 2018-04-16 | 1D81273-02 | 0.350 ppb |
| 2018-07-18 | 1G81587-01 | 0.640 ppb |
| 2018-07-18 | 1G81587-02 | 0.780 ppb |
| 2018-10-15 | 1J81373-01 | 0.210 ppb |
| 2018-10-15 | 1J81373-02 | ND |
| 2019-01-22 | 1A91645-01 | 0.360 ppb |
| 2019-01-22 | 1A91645-02 | 0.520 ppb |
| 2019-04-16 | 1D91548-01 | ND |
| 2019-04-16 | 1D91548-02 | ND |
| 2019-07-15 | 1G91376-01 | 1.07 ppb |
| 2019-07-15 | 1G91376-02 | 1.06 ppb |
| 2019-10-29 | 1J92521-02 | ND |
| 2019-10-29 | 1J92521-01 | ND |