Bromoform
Harwich Water 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.
Testing results - average by year
Year | Average result | Samples taken | Detections | Range of results |
---|---|---|---|---|
2014 | 0.229 ppb | 28 | 2 | ND - 3.20 ppb |
2015 | 0.370 ppb | 36 | 8 | ND - 2.60 ppb |
2016 | 0.353 ppb | 36 | 6 | ND - 4.20 ppb |
2017 | 0.252 ppb | 52 | 8 | ND - 2.80 ppb |
2018 | 0.518 ppb | 50 | 12 | ND - 3.80 ppb |
2019 | 0.279 ppb | 38 | 6 | ND - 2.20 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 |
---|---|
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-02-27 | ND |
2014-03-05 | 3.20 ppb |
2014-03-05 | 3.20 ppb |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2014-03-06 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-25 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-02-26 | ND |
2015-03-13 | 2.00 ppb |
2015-03-13 | 2.00 ppb |
2015-08-12 | ND |
2015-08-12 | ND |
2015-08-12 | 2.60 ppb |
2015-08-12 | 2.60 ppb |
2015-08-12 | 0.560 ppb |
2015-08-12 | 0.560 ppb |
2015-08-12 | 1.50 ppb |
2015-08-12 | 1.50 ppb |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-02-29 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-02 | ND |
2016-03-23 | ND |
2016-03-23 | ND |
2016-03-23 | ND |
2016-03-23 | ND |
2016-08-24 | 0.850 ppb |
2016-08-24 | 0.850 ppb |
2016-08-24 | 4.20 ppb |
2016-08-24 | 4.20 ppb |
2016-08-24 | ND |
2016-08-24 | ND |
2016-08-24 | 1.30 ppb |
2016-08-24 | 1.30 ppb |
2017-02-28 | ND |
2017-02-28 | ND |
2017-02-28 | ND |
2017-02-28 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-03-09 | ND |
2017-05-17 | ND |
2017-05-17 | ND |
2017-05-17 | ND |
2017-05-17 | ND |
2017-06-07 | ND |
2017-06-07 | ND |
2017-08-09 | ND |
2017-08-09 | ND |
2017-08-09 | ND |
2017-08-09 | ND |
2017-08-10 | 0.810 ppb |
2017-08-10 | 0.810 ppb |
2017-08-10 | 2.80 ppb |
2017-08-10 | 2.80 ppb |
2017-08-10 | 0.530 ppb |
2017-08-10 | 0.530 ppb |
2017-08-10 | 2.40 ppb |
2017-08-10 | 2.40 ppb |
2017-12-20 | ND |
2017-12-20 | ND |
2017-12-21 | ND |
2017-12-21 | ND |
2017-12-21 | ND |
2017-12-21 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-03-08 | ND |
2018-05-16 | ND |
2018-05-16 | ND |
2018-05-16 | 2.00 ppb |
2018-05-16 | 2.00 ppb |
2018-05-16 | 3.60 ppb |
2018-05-16 | 3.60 ppb |
2018-08-14 | 0.670 ppb |
2018-08-14 | 0.670 ppb |
2018-08-14 | 0.690 ppb |
2018-08-14 | 0.690 ppb |
2018-08-15 | 3.80 ppb |
2018-08-15 | 3.80 ppb |
2018-08-15 | 2.20 ppb |
2018-08-15 | 2.20 ppb |
2018-08-15 | ND |
2018-08-15 | ND |
2018-08-15 | ND |
2018-08-15 | ND |
2018-08-22 | ND |
2018-08-22 | ND |
2018-12-10 | ND |
2018-12-10 | ND |
2018-12-10 | ND |
2018-12-10 | ND |
2018-12-10 | ND |
2018-12-10 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-06 | ND |
2019-03-07 | ND |
2019-03-07 | ND |
2019-03-07 | ND |
2019-03-07 | ND |
2019-06-19 | ND |
2019-06-19 | ND |
2019-06-19 | ND |
2019-06-19 | ND |
2019-06-19 | ND |
2019-06-19 | ND |
2019-08-15 | ND |
2019-08-15 | ND |
2019-08-15 | ND |
2019-08-15 | ND |
2019-08-15 | ND |
2019-08-15 | ND |
2019-08-19 | ND |
2019-08-19 | ND |
2019-08-19 | 1.60 ppb |
2019-08-19 | 1.60 ppb |
2019-08-26 | 2.20 ppb |
2019-08-26 | 2.20 ppb |
2019-08-26 | 1.50 ppb |
2019-08-26 | 1.50 ppb |
2019-12-04 | ND |
2019-12-04 | ND |
2019-12-04 | ND |
2019-12-04 | ND |
2019-12-04 | ND |
2019-12-04 | ND |