Bromoform
Wellesley Water Division (MWRA)
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 | 1.14 ppb | 24 | 22 | ND - 2.01 ppb |
2015 | 1.47 ppb | 56 | 54 | ND - 4.11 ppb |
2016 | 1.68 ppb | 56 | 54 | ND - 4.35 ppb |
2017 | 1.61 ppb | 56 | 56 | 0.660 ppb - 4.35 ppb |
2018 | 1.77 ppb | 56 | 56 | 0.760 ppb - 6.02 ppb |
2019 | 1.79 ppb | 54 | 54 | 0.790 ppb - 7.09 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 |
---|---|
2014-02-06 | 0.920 ppb |
2014-02-06 | 0.920 ppb |
2014-02-06 | 1.80 ppb |
2014-02-06 | 1.80 ppb |
2014-02-06 | 0.740 ppb |
2014-02-06 | 0.740 ppb |
2014-05-05 | 1.16 ppb |
2014-05-05 | 1.16 ppb |
2014-05-05 | 1.09 ppb |
2014-05-05 | 1.09 ppb |
2014-05-05 | 1.15 ppb |
2014-05-05 | 1.15 ppb |
2014-08-04 | 1.37 ppb |
2014-08-04 | 1.37 ppb |
2014-08-04 | 2.01 ppb |
2014-08-04 | 2.01 ppb |
2014-08-04 | 0.580 ppb |
2014-08-04 | 0.580 ppb |
2014-11-06 | 1.32 ppb |
2014-11-06 | 1.32 ppb |
2014-11-06 | 1.57 ppb |
2014-11-06 | 1.57 ppb |
2014-11-06 | ND |
2014-11-06 | ND |
2015-02-04 | ND |
2015-02-04 | ND |
2015-02-04 | 0.950 ppb |
2015-02-04 | 0.950 ppb |
2015-02-04 | 0.600 ppb |
2015-02-04 | 0.600 ppb |
2015-02-04 | 1.30 ppb |
2015-02-04 | 1.30 ppb |
2015-03-11 | 1.03 ppb |
2015-03-11 | 1.03 ppb |
2015-03-11 | 1.43 ppb |
2015-03-11 | 1.43 ppb |
2015-03-11 | 0.760 ppb |
2015-03-11 | 0.760 ppb |
2015-05-06 | 1.37 ppb |
2015-05-06 | 1.37 ppb |
2015-05-06 | 1.49 ppb |
2015-05-06 | 1.49 ppb |
2015-05-06 | 1.48 ppb |
2015-05-06 | 1.48 ppb |
2015-05-06 | 1.30 ppb |
2015-05-06 | 1.30 ppb |
2015-05-06 | 1.50 ppb |
2015-05-06 | 1.50 ppb |
2015-05-06 | 0.980 ppb |
2015-05-06 | 0.980 ppb |
2015-05-06 | 3.73 ppb |
2015-05-06 | 3.73 ppb |
2015-08-06 | 1.58 ppb |
2015-08-06 | 1.58 ppb |
2015-08-06 | 1.59 ppb |
2015-08-06 | 1.59 ppb |
2015-08-06 | 1.70 ppb |
2015-08-06 | 1.70 ppb |
2015-08-06 | 1.12 ppb |
2015-08-06 | 1.12 ppb |
2015-08-06 | 1.10 ppb |
2015-08-06 | 1.10 ppb |
2015-08-06 | 0.910 ppb |
2015-08-06 | 0.910 ppb |
2015-08-06 | 2.55 ppb |
2015-08-06 | 2.55 ppb |
2015-11-05 | 1.62 ppb |
2015-11-05 | 1.62 ppb |
2015-11-05 | 1.51 ppb |
2015-11-05 | 1.51 ppb |
2015-11-05 | 1.61 ppb |
2015-11-05 | 1.61 ppb |
2015-11-05 | 1.52 ppb |
2015-11-05 | 1.52 ppb |
2015-11-05 | 1.29 ppb |
2015-11-05 | 1.29 ppb |
2015-11-05 | 1.05 ppb |
2015-11-05 | 1.05 ppb |
2015-11-05 | 4.11 ppb |
2015-11-05 | 4.11 ppb |
2016-02-03 | 0.890 ppb |
2016-02-03 | 0.890 ppb |
2016-02-03 | 1.49 ppb |
2016-02-03 | 1.49 ppb |
2016-02-03 | 0.910 ppb |
2016-02-03 | 0.910 ppb |
2016-02-03 | ND |
2016-02-03 | ND |
2016-02-03 | 2.14 ppb |
2016-02-03 | 2.14 ppb |
2016-02-03 | 3.29 ppb |
2016-02-03 | 3.29 ppb |
2016-03-08 | 0.910 ppb |
2016-03-08 | 0.910 ppb |
2016-05-04 | 1.25 ppb |
2016-05-04 | 1.25 ppb |
2016-05-04 | 1.12 ppb |
2016-05-04 | 1.12 ppb |
2016-05-04 | 1.92 ppb |
2016-05-04 | 1.92 ppb |
2016-05-04 | 1.12 ppb |
2016-05-04 | 1.12 ppb |
2016-05-04 | 1.39 ppb |
2016-05-04 | 1.39 ppb |
2016-05-04 | 0.770 ppb |
2016-05-04 | 0.770 ppb |
2016-05-04 | 2.84 ppb |
2016-05-04 | 2.84 ppb |
2016-08-03 | 1.40 ppb |
2016-08-03 | 1.40 ppb |
2016-08-03 | 1.90 ppb |
2016-08-03 | 1.90 ppb |
2016-08-03 | 1.34 ppb |
2016-08-03 | 1.34 ppb |
2016-08-03 | 1.19 ppb |
2016-08-03 | 1.19 ppb |
2016-08-03 | 2.21 ppb |
2016-08-03 | 2.21 ppb |
2016-08-03 | 1.26 ppb |
2016-08-03 | 1.26 ppb |
2016-08-03 | 4.16 ppb |
2016-08-03 | 4.16 ppb |
2016-11-03 | 1.70 ppb |
2016-11-03 | 1.70 ppb |
2016-11-03 | 0.930 ppb |
2016-11-03 | 0.930 ppb |
2016-11-03 | 1.94 ppb |
2016-11-03 | 1.94 ppb |
2016-11-03 | 1.60 ppb |
2016-11-03 | 1.60 ppb |
2016-11-03 | 1.98 ppb |
2016-11-03 | 1.98 ppb |
2016-11-03 | 1.07 ppb |
2016-11-03 | 1.07 ppb |
2016-11-03 | 4.35 ppb |
2016-11-03 | 4.35 ppb |
2017-02-01 | 1.33 ppb |
2017-02-01 | 1.33 ppb |
2017-02-01 | 0.980 ppb |
2017-02-01 | 0.980 ppb |
2017-02-01 | 1.92 ppb |
2017-02-01 | 1.92 ppb |
2017-02-01 | 1.37 ppb |
2017-02-01 | 1.37 ppb |
2017-02-01 | 1.54 ppb |
2017-02-01 | 1.54 ppb |
2017-02-01 | 0.940 ppb |
2017-02-01 | 0.940 ppb |
2017-02-01 | 3.28 ppb |
2017-02-01 | 3.28 ppb |
2017-05-03 | 1.38 ppb |
2017-05-03 | 1.38 ppb |
2017-05-03 | 1.20 ppb |
2017-05-03 | 1.20 ppb |
2017-05-03 | 1.68 ppb |
2017-05-03 | 1.68 ppb |
2017-05-03 | 1.20 ppb |
2017-05-03 | 1.20 ppb |
2017-05-03 | 2.21 ppb |
2017-05-03 | 2.21 ppb |
2017-05-03 | 1.15 ppb |
2017-05-03 | 1.15 ppb |
2017-05-03 | 3.89 ppb |
2017-05-03 | 3.89 ppb |
2017-08-03 | 1.15 ppb |
2017-08-03 | 1.15 ppb |
2017-08-03 | 1.65 ppb |
2017-08-03 | 1.65 ppb |
2017-08-03 | 0.930 ppb |
2017-08-03 | 0.930 ppb |
2017-08-03 | 4.35 ppb |
2017-08-03 | 4.35 ppb |
2017-08-29 | 1.44 ppb |
2017-08-29 | 1.44 ppb |
2017-08-29 | 2.88 ppb |
2017-08-29 | 2.88 ppb |
2017-08-29 | 0.930 ppb |
2017-08-29 | 0.930 ppb |
2017-11-06 | 1.05 ppb |
2017-11-06 | 1.05 ppb |
2017-11-06 | 0.960 ppb |
2017-11-06 | 0.960 ppb |
2017-11-06 | 0.660 ppb |
2017-11-06 | 0.660 ppb |
2017-11-06 | 1.000 ppb |
2017-11-06 | 1.000 ppb |
2017-11-06 | 2.49 ppb |
2017-11-06 | 2.49 ppb |
2017-11-06 | 0.700 ppb |
2017-11-06 | 0.700 ppb |
2017-11-06 | 0.900 ppb |
2017-11-06 | 0.900 ppb |
2018-02-08 | 1.09 ppb |
2018-02-08 | 1.09 ppb |
2018-02-08 | 1.03 ppb |
2018-02-08 | 1.03 ppb |
2018-02-08 | 1.21 ppb |
2018-02-08 | 1.21 ppb |
2018-02-08 | 0.980 ppb |
2018-02-08 | 0.980 ppb |
2018-02-08 | 1.79 ppb |
2018-02-08 | 1.79 ppb |
2018-02-08 | 0.780 ppb |
2018-02-08 | 0.780 ppb |
2018-02-08 | 3.19 ppb |
2018-02-08 | 3.19 ppb |
2018-05-03 | 1.78 ppb |
2018-05-03 | 1.78 ppb |
2018-05-03 | 1.36 ppb |
2018-05-03 | 1.36 ppb |
2018-05-03 | 2.13 ppb |
2018-05-03 | 2.13 ppb |
2018-05-03 | 1.30 ppb |
2018-05-03 | 1.30 ppb |
2018-05-03 | 1.88 ppb |
2018-05-03 | 1.88 ppb |
2018-05-03 | 0.980 ppb |
2018-05-03 | 0.980 ppb |
2018-05-03 | 6.02 ppb |
2018-05-03 | 6.02 ppb |
2018-08-01 | 1.000 ppb |
2018-08-01 | 1.000 ppb |
2018-08-01 | 1.46 ppb |
2018-08-01 | 1.46 ppb |
2018-08-01 | 1.80 ppb |
2018-08-01 | 1.80 ppb |
2018-08-01 | 1.000 ppb |
2018-08-01 | 1.000 ppb |
2018-08-01 | 1.71 ppb |
2018-08-01 | 1.71 ppb |
2018-08-01 | 0.760 ppb |
2018-08-01 | 0.760 ppb |
2018-08-01 | 4.40 ppb |
2018-08-01 | 4.40 ppb |
2018-11-01 | 1.05 ppb |
2018-11-01 | 1.05 ppb |
2018-11-01 | 1.34 ppb |
2018-11-01 | 1.34 ppb |
2018-11-01 | 1.51 ppb |
2018-11-01 | 1.51 ppb |
2018-11-01 | 1.06 ppb |
2018-11-01 | 1.06 ppb |
2018-11-01 | 1.27 ppb |
2018-11-01 | 1.27 ppb |
2018-11-01 | 0.860 ppb |
2018-11-01 | 0.860 ppb |
2018-11-01 | 4.85 ppb |
2018-11-01 | 4.85 ppb |
2019-02-04 | 1.02 ppb |
2019-02-04 | 1.02 ppb |
2019-02-04 | 0.880 ppb |
2019-02-04 | 0.880 ppb |
2019-02-04 | 1.28 ppb |
2019-02-04 | 1.28 ppb |
2019-02-04 | 1.02 ppb |
2019-02-04 | 1.02 ppb |
2019-02-04 | 1.86 ppb |
2019-02-04 | 1.86 ppb |
2019-02-04 | 1.12 ppb |
2019-02-04 | 1.12 ppb |
2019-02-04 | 3.90 ppb |
2019-02-04 | 3.90 ppb |
2019-05-01 | 1.08 ppb |
2019-05-01 | 1.08 ppb |
2019-05-01 | 1.52 ppb |
2019-05-01 | 1.52 ppb |
2019-05-01 | 1.22 ppb |
2019-05-01 | 1.22 ppb |
2019-05-01 | 2.14 ppb |
2019-05-01 | 2.14 ppb |
2019-05-01 | 0.860 ppb |
2019-05-01 | 0.860 ppb |
2019-05-01 | 4.20 ppb |
2019-05-01 | 4.20 ppb |
2019-08-02 | 0.920 ppb |
2019-08-02 | 0.920 ppb |
2019-08-02 | 0.910 ppb |
2019-08-02 | 0.910 ppb |
2019-08-02 | 1.49 ppb |
2019-08-02 | 1.49 ppb |
2019-08-02 | 0.920 ppb |
2019-08-02 | 0.920 ppb |
2019-08-02 | 2.19 ppb |
2019-08-02 | 2.19 ppb |
2019-08-02 | 0.810 ppb |
2019-08-02 | 0.810 ppb |
2019-08-02 | 7.09 ppb |
2019-08-02 | 7.09 ppb |
2019-11-07 | 0.980 ppb |
2019-11-07 | 0.980 ppb |
2019-11-07 | 0.790 ppb |
2019-11-07 | 0.790 ppb |
2019-11-07 | 1.44 ppb |
2019-11-07 | 1.44 ppb |
2019-11-07 | 0.980 ppb |
2019-11-07 | 0.980 ppb |
2019-11-07 | 2.79 ppb |
2019-11-07 | 2.79 ppb |
2019-11-07 | 0.970 ppb |
2019-11-07 | 0.970 ppb |
2019-11-07 | 3.96 ppb |
2019-11-07 | 3.96 ppb |