Bromoform
Darboy Sanitary District 1
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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.254 ppb | 5 | 3 | ND - 0.590 ppb |
2015 | 0.287 ppb | 3 | 2 | ND - 0.510 ppb |
2016 | 0.213 ppb | 4 | 3 | ND - 0.420 ppb |
2017 | 0.365 ppb | 4 | 3 | ND - 0.560 ppb |
2018 | ND | 3 | 0 | ND |
2019 | 0.327 ppb | 3 | 3 | 0.260 ppb - 0.370 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 |
---|---|---|
2014-05-29 | 5027069A | ND |
2014-08-21 | 812173 | ND |
2014-08-21 | 812171 | 0.200 ppb |
2014-08-21 | 812175 | 0.480 ppb |
2014-08-21 | 812176 | 0.590 ppb |
2015-05-13 | 5028921X | ND |
2015-07-29 | 873912 | 0.350 ppb |
2015-07-29 | 873911 | 0.510 ppb |
2016-05-13 | 5031080A | ND |
2016-08-12 | 938806 | 0.420 ppb |
2016-08-12 | 938805 | 0.240 ppb |
2016-08-12 | 938807 | 0.190 ppb |
2017-08-24 | 1013489 | ND |
2017-08-24 | 1013493 | 0.350 ppb |
2017-08-24 | 1013598 | 0.550 ppb |
2017-08-24 | 1013599 | 0.560 ppb |
2018-05-25 | 5034705B | ND |
2018-08-23 | 1075743 | ND |
2018-08-23 | 1075744 | ND |
2019-07-18 | 1135409 | 0.260 ppb |
2019-07-18 | 1135410 | 0.370 ppb |
2019-08-14 | 1140949 | 0.350 ppb |