Bromoform
Braintree Water and Sewer 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.
Samples
Samples exceeding legal limit (MCL)
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2013 | N/A | 0 | 0 | N/A |
| 2014 | 1.36 ppb | 2 | 2 | 1.36 ppb |
| 2015 | 0.670 ppb | 2 | 2 | 0.670 ppb |
| 2016 | 0.640 ppb | 2 | 2 | 0.640 ppb |
| 2017 | 0.864 ppb | 26 | 24 | ND - 1.50 ppb |
| 2018 | 0.386 ppb | 18 | 10 | ND - 0.770 ppb |
| 2019 | 0.438 ppb | 34 | 18 | ND - 1.60 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 | Result |
|---|---|
| 2014-06-26 | 1.36 ppb |
| 2014-06-26 | 1.36 ppb |
| 2015-07-31 | 0.670 ppb |
| 2015-07-31 | 0.670 ppb |
| 2016-06-14 | 0.640 ppb |
| 2016-06-14 | 0.640 ppb |
| 2017-03-09 | 0.690 ppb |
| 2017-03-09 | 0.690 ppb |
| 2017-03-09 | 0.670 ppb |
| 2017-03-09 | 0.670 ppb |
| 2017-03-09 | 1.10 ppb |
| 2017-03-09 | 1.10 ppb |
| 2017-03-09 | 0.770 ppb |
| 2017-03-09 | 0.770 ppb |
| 2017-06-16 | ND |
| 2017-06-16 | 0.760 ppb |
| 2017-06-16 | 0.760 ppb |
| 2017-06-16 | 0.680 ppb |
| 2017-06-16 | 0.710 ppb |
| 2017-06-16 | 0.710 ppb |
| 2017-06-16 | 0.550 ppb |
| 2017-06-16 | 0.550 ppb |
| 2017-06-16 | 0.680 ppb |
| 2017-06-16 | ND |
| 2017-09-15 | 1.000 ppb |
| 2017-09-15 | 1.50 ppb |
| 2017-09-15 | 1.50 ppb |
| 2017-09-15 | 1.000 ppb |
| 2017-09-15 | 1.40 ppb |
| 2017-09-15 | 1.40 ppb |
| 2017-09-15 | 1.40 ppb |
| 2017-09-15 | 1.40 ppb |
| 2018-06-07 | 0.530 ppb |
| 2018-06-07 | 0.530 ppb |
| 2018-06-07 | 0.720 ppb |
| 2018-06-07 | 0.720 ppb |
| 2018-06-07 | ND |
| 2018-06-07 | ND |
| 2018-06-07 | 0.740 ppb |
| 2018-06-07 | 0.740 ppb |
| 2018-06-07 | 0.710 ppb |
| 2018-06-07 | 0.710 ppb |
| 2018-12-14 | ND |
| 2018-12-14 | ND |
| 2018-12-14 | ND |
| 2018-12-14 | ND |
| 2018-12-14 | ND |
| 2018-12-14 | ND |
| 2018-12-14 | 0.770 ppb |
| 2018-12-14 | 0.770 ppb |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-03-11 | ND |
| 2019-06-19 | 0.670 ppb |
| 2019-06-19 | 0.680 ppb |
| 2019-06-19 | 0.680 ppb |
| 2019-06-19 | 0.910 ppb |
| 2019-06-19 | 0.910 ppb |
| 2019-06-19 | 0.570 ppb |
| 2019-06-19 | 0.570 ppb |
| 2019-06-19 | ND |
| 2019-06-19 | ND |
| 2019-06-19 | 0.670 ppb |
| 2019-09-17 | 0.750 ppb |
| 2019-09-17 | 0.590 ppb |
| 2019-09-17 | 0.590 ppb |
| 2019-09-17 | 0.980 ppb |
| 2019-09-17 | 0.750 ppb |
| 2019-09-17 | 0.980 ppb |
| 2019-09-17 | 0.690 ppb |
| 2019-09-17 | 0.690 ppb |
| 2019-12-16 | ND |
| 2019-12-16 | ND |
| 2019-12-16 | ND |
| 2019-12-16 | ND |
| 2019-12-16 | 1.60 ppb |
| 2019-12-16 | 1.60 ppb |
| 2019-12-16 | ND |
| 2019-12-16 | ND |