Bromoform
Natick 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 |
---|---|---|---|---|
2013 | N/A | 0 | 0 | N/A |
2014 | 1.52 ppb | 52 | 34 | ND - 3.80 ppb |
2015 | 2.32 ppb | 76 | 58 | ND - 5.40 ppb |
2016 | 2.07 ppb | 76 | 58 | ND - 4.60 ppb |
2017 | 2.23 ppb | 80 | 60 | ND - 5.30 ppb |
2018 | 1.89 ppb | 86 | 70 | ND - 4.30 ppb |
2019 | 1.70 ppb | 76 | 58 | ND - 6.00 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 |
---|---|
2014-01-14 | ND |
2014-01-14 | ND |
2014-01-14 | ND |
2014-01-14 | ND |
2014-01-14 | 3.50 ppb |
2014-01-14 | 3.50 ppb |
2014-02-04 | 1.50 ppb |
2014-02-04 | 1.50 ppb |
2014-02-04 | 2.70 ppb |
2014-02-04 | 2.70 ppb |
2014-03-04 | 2.00 ppb |
2014-03-04 | 2.00 ppb |
2014-04-01 | 3.30 ppb |
2014-04-01 | 3.30 ppb |
2014-05-06 | 1.70 ppb |
2014-05-06 | 1.70 ppb |
2014-05-06 | ND |
2014-05-06 | ND |
2014-05-06 | 2.20 ppb |
2014-05-06 | 2.20 ppb |
2014-05-13 | 1.90 ppb |
2014-05-13 | 1.90 ppb |
2014-06-03 | 1.90 ppb |
2014-06-03 | 1.90 ppb |
2014-07-01 | 1.70 ppb |
2014-07-01 | 1.70 ppb |
2014-08-05 | 2.70 ppb |
2014-08-05 | 2.70 ppb |
2014-08-06 | 2.00 ppb |
2014-08-06 | 2.00 ppb |
2014-08-06 | ND |
2014-08-06 | ND |
2014-08-06 | 2.20 ppb |
2014-08-06 | 2.20 ppb |
2014-09-02 | 2.20 ppb |
2014-09-02 | 2.20 ppb |
2014-09-03 | ND |
2014-09-03 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-10-14 | ND |
2014-11-04 | 3.80 ppb |
2014-11-04 | 3.80 ppb |
2014-11-04 | 2.50 ppb |
2014-11-04 | 2.50 ppb |
2014-12-02 | 1.60 ppb |
2014-12-02 | 1.60 ppb |
2015-01-13 | ND |
2015-01-13 | ND |
2015-01-13 | ND |
2015-01-13 | ND |
2015-01-13 | 3.70 ppb |
2015-01-13 | 3.70 ppb |
2015-02-03 | 3.00 ppb |
2015-02-03 | 3.00 ppb |
2015-02-03 | 2.90 ppb |
2015-02-03 | 2.90 ppb |
2015-02-03 | 2.30 ppb |
2015-02-03 | 2.30 ppb |
2015-02-03 | 2.30 ppb |
2015-02-03 | 2.30 ppb |
2015-02-03 | 3.70 ppb |
2015-02-03 | 3.70 ppb |
2015-03-03 | 2.60 ppb |
2015-03-03 | 2.60 ppb |
2015-04-07 | 2.70 ppb |
2015-04-07 | 2.70 ppb |
2015-04-22 | ND |
2015-04-22 | ND |
2015-04-22 | ND |
2015-04-22 | ND |
2015-04-22 | 2.10 ppb |
2015-04-22 | 2.10 ppb |
2015-05-05 | 3.90 ppb |
2015-05-05 | 3.90 ppb |
2015-05-05 | 3.70 ppb |
2015-05-05 | 3.70 ppb |
2015-05-05 | 2.80 ppb |
2015-05-05 | 2.80 ppb |
2015-05-05 | 4.60 ppb |
2015-05-05 | 4.60 ppb |
2015-05-05 | 3.60 ppb |
2015-05-05 | 3.60 ppb |
2015-06-03 | 2.50 ppb |
2015-06-03 | 2.50 ppb |
2015-07-07 | 1.90 ppb |
2015-07-07 | 1.90 ppb |
2015-08-04 | 3.30 ppb |
2015-08-04 | 3.30 ppb |
2015-08-04 | 3.50 ppb |
2015-08-04 | 3.50 ppb |
2015-08-04 | 2.60 ppb |
2015-08-04 | 2.60 ppb |
2015-08-04 | ND |
2015-08-04 | ND |
2015-08-04 | ND |
2015-08-04 | ND |
2015-08-04 | 2.00 ppb |
2015-08-04 | 2.00 ppb |
2015-08-04 | ND |
2015-08-04 | ND |
2015-09-01 | 2.00 ppb |
2015-09-01 | 2.00 ppb |
2015-10-07 | 1.60 ppb |
2015-10-07 | 1.60 ppb |
2015-11-03 | 3.90 ppb |
2015-11-03 | 3.90 ppb |
2015-11-03 | 4.00 ppb |
2015-11-03 | 4.00 ppb |
2015-11-03 | 4.00 ppb |
2015-11-03 | 4.00 ppb |
2015-11-03 | ND |
2015-11-03 | ND |
2015-11-03 | ND |
2015-11-03 | ND |
2015-11-03 | 5.40 ppb |
2015-11-03 | 5.40 ppb |
2015-11-03 | 2.50 ppb |
2015-11-03 | 2.50 ppb |
2015-11-03 | 3.60 ppb |
2015-11-03 | 3.60 ppb |
2015-12-09 | 1.60 ppb |
2015-12-09 | 1.60 ppb |
2016-01-06 | 4.40 ppb |
2016-01-06 | 4.40 ppb |
2016-02-02 | 2.70 ppb |
2016-02-02 | 2.70 ppb |
2016-02-02 | 2.30 ppb |
2016-02-02 | 2.30 ppb |
2016-02-02 | 2.20 ppb |
2016-02-02 | 2.20 ppb |
2016-02-02 | ND |
2016-02-02 | ND |
2016-02-02 | ND |
2016-02-02 | ND |
2016-02-02 | 1.000 ppb |
2016-02-02 | 1.000 ppb |
2016-02-02 | 3.80 ppb |
2016-02-02 | 3.80 ppb |
2016-02-02 | 4.10 ppb |
2016-02-02 | 4.10 ppb |
2016-03-01 | 2.40 ppb |
2016-03-01 | 2.40 ppb |
2016-04-13 | 3.00 ppb |
2016-04-13 | 3.00 ppb |
2016-05-03 | 2.90 ppb |
2016-05-03 | 2.90 ppb |
2016-05-03 | 2.50 ppb |
2016-05-03 | 2.50 ppb |
2016-05-03 | 1.70 ppb |
2016-05-03 | 1.70 ppb |
2016-05-03 | ND |
2016-05-03 | ND |
2016-05-03 | ND |
2016-05-03 | ND |
2016-05-03 | 3.20 ppb |
2016-05-03 | 3.20 ppb |
2016-05-03 | 4.30 ppb |
2016-05-03 | 4.30 ppb |
2016-06-08 | 2.60 ppb |
2016-06-08 | 2.60 ppb |
2016-07-06 | 2.20 ppb |
2016-07-06 | 2.20 ppb |
2016-08-02 | 2.80 ppb |
2016-08-02 | 2.80 ppb |
2016-08-02 | 4.60 ppb |
2016-08-02 | 4.60 ppb |
2016-08-02 | 1.60 ppb |
2016-08-02 | 1.60 ppb |
2016-08-02 | ND |
2016-08-02 | ND |
2016-08-02 | ND |
2016-08-02 | ND |
2016-08-02 | 1.90 ppb |
2016-08-02 | 1.90 ppb |
2016-08-02 | ND |
2016-08-02 | ND |
2016-09-07 | 1.90 ppb |
2016-09-07 | 1.90 ppb |
2016-10-04 | 2.10 ppb |
2016-10-04 | 2.10 ppb |
2016-11-01 | 2.90 ppb |
2016-11-01 | 2.90 ppb |
2016-11-01 | 3.20 ppb |
2016-11-01 | 3.20 ppb |
2016-11-01 | 3.00 ppb |
2016-11-01 | 3.00 ppb |
2016-11-01 | ND |
2016-11-01 | ND |
2016-11-01 | ND |
2016-11-01 | ND |
2016-11-01 | 2.30 ppb |
2016-11-01 | 2.30 ppb |
2016-11-01 | 1.60 ppb |
2016-11-01 | 1.60 ppb |
2016-11-01 | 3.30 ppb |
2016-11-01 | 3.30 ppb |
2016-12-06 | 2.30 ppb |
2016-12-06 | 2.30 ppb |
2017-01-10 | 2.90 ppb |
2017-01-10 | 2.90 ppb |
2017-02-08 | 2.70 ppb |
2017-02-08 | 2.70 ppb |
2017-02-08 | 2.00 ppb |
2017-02-08 | 2.00 ppb |
2017-02-08 | 2.10 ppb |
2017-02-08 | 2.10 ppb |
2017-02-08 | ND |
2017-02-08 | ND |
2017-02-08 | ND |
2017-02-08 | ND |
2017-02-08 | 3.00 ppb |
2017-02-08 | 3.00 ppb |
2017-02-08 | 2.40 ppb |
2017-02-08 | 2.40 ppb |
2017-03-07 | 2.50 ppb |
2017-03-07 | 2.50 ppb |
2017-04-05 | 4.30 ppb |
2017-04-05 | 4.30 ppb |
2017-05-03 | 3.60 ppb |
2017-05-03 | 3.60 ppb |
2017-05-03 | 2.50 ppb |
2017-05-03 | 2.50 ppb |
2017-05-03 | 1.80 ppb |
2017-05-03 | 1.80 ppb |
2017-05-03 | ND |
2017-05-03 | ND |
2017-05-03 | ND |
2017-05-03 | ND |
2017-05-03 | 2.30 ppb |
2017-05-03 | 2.30 ppb |
2017-05-03 | 2.50 ppb |
2017-05-03 | 2.50 ppb |
2017-05-03 | 4.90 ppb |
2017-05-03 | 4.90 ppb |
2017-06-07 | 5.30 ppb |
2017-06-07 | 5.30 ppb |
2017-07-05 | 3.00 ppb |
2017-07-05 | 3.00 ppb |
2017-08-01 | 2.20 ppb |
2017-08-01 | 2.20 ppb |
2017-08-09 | 3.30 ppb |
2017-08-09 | 3.30 ppb |
2017-08-09 | 2.30 ppb |
2017-08-09 | 2.30 ppb |
2017-08-09 | 1.70 ppb |
2017-08-09 | 1.70 ppb |
2017-08-09 | ND |
2017-08-09 | ND |
2017-08-09 | ND |
2017-08-09 | ND |
2017-08-09 | 2.00 ppb |
2017-08-09 | 2.00 ppb |
2017-08-09 | 3.00 ppb |
2017-08-09 | 3.00 ppb |
2017-09-05 | 1.90 ppb |
2017-09-05 | 1.90 ppb |
2017-10-03 | ND |
2017-10-03 | ND |
2017-11-08 | 3.70 ppb |
2017-11-08 | 3.70 ppb |
2017-11-08 | 3.60 ppb |
2017-11-08 | 3.60 ppb |
2017-11-08 | 3.40 ppb |
2017-11-08 | 3.40 ppb |
2017-11-08 | ND |
2017-11-08 | ND |
2017-11-08 | 4.20 ppb |
2017-11-08 | 4.20 ppb |
2017-11-08 | ND |
2017-11-08 | ND |
2017-11-08 | 3.10 ppb |
2017-11-08 | 3.10 ppb |
2017-11-08 | 3.20 ppb |
2017-11-08 | 3.20 ppb |
2017-11-08 | ND |
2017-11-08 | ND |
2017-12-05 | 3.70 ppb |
2017-12-05 | 3.70 ppb |
2018-01-03 | 3.20 ppb |
2018-01-03 | 3.20 ppb |
2018-02-06 | 2.30 ppb |
2018-02-06 | 2.30 ppb |
2018-02-06 | 1.80 ppb |
2018-02-06 | 1.80 ppb |
2018-02-06 | 1.70 ppb |
2018-02-06 | 1.70 ppb |
2018-02-06 | 1.70 ppb |
2018-02-06 | 1.70 ppb |
2018-02-08 | ND |
2018-02-08 | ND |
2018-02-08 | ND |
2018-02-08 | ND |
2018-02-08 | 2.90 ppb |
2018-02-08 | 2.90 ppb |
2018-03-12 | 2.50 ppb |
2018-03-12 | 2.50 ppb |
2018-04-03 | 3.80 ppb |
2018-04-03 | 3.80 ppb |
2018-05-01 | 3.70 ppb |
2018-05-01 | 3.70 ppb |
2018-05-01 | 3.70 ppb |
2018-05-01 | 3.70 ppb |
2018-05-01 | 4.10 ppb |
2018-05-01 | 4.10 ppb |
2018-05-01 | 1.70 ppb |
2018-05-01 | 1.70 ppb |
2018-05-01 | 4.30 ppb |
2018-05-01 | 4.30 ppb |
2018-05-08 | ND |
2018-05-08 | ND |
2018-05-08 | ND |
2018-05-08 | ND |
2018-05-08 | 2.10 ppb |
2018-05-08 | 2.10 ppb |
2018-06-05 | 1.70 ppb |
2018-06-05 | 1.70 ppb |
2018-07-10 | ND |
2018-07-10 | ND |
2018-07-10 | ND |
2018-07-10 | ND |
2018-07-10 | 0.780 ppb |
2018-07-10 | 0.780 ppb |
2018-07-10 | 2.00 ppb |
2018-07-10 | 2.00 ppb |
2018-07-17 | 2.70 ppb |
2018-07-17 | 2.70 ppb |
2018-07-17 | 2.40 ppb |
2018-07-17 | 2.40 ppb |
2018-07-17 | 1.50 ppb |
2018-07-17 | 1.50 ppb |
2018-07-17 | 1.50 ppb |
2018-07-17 | 1.50 ppb |
2018-08-07 | 1.50 ppb |
2018-08-07 | 1.50 ppb |
2018-09-04 | 2.10 ppb |
2018-09-04 | 2.10 ppb |
2018-09-24 | 3.10 ppb |
2018-09-24 | 3.10 ppb |
2018-09-24 | 2.40 ppb |
2018-09-24 | 2.40 ppb |
2018-09-24 | 1.10 ppb |
2018-09-24 | 1.10 ppb |
2018-09-24 | 3.20 ppb |
2018-09-24 | 3.20 ppb |
2018-10-02 | 2.90 ppb |
2018-10-02 | 2.90 ppb |
2018-11-06 | 3.30 ppb |
2018-11-06 | 3.30 ppb |
2018-11-06 | 1.20 ppb |
2018-11-06 | 1.20 ppb |
2018-11-06 | 1.10 ppb |
2018-11-06 | 1.10 ppb |
2018-11-06 | ND |
2018-11-06 | ND |
2018-11-06 | ND |
2018-11-06 | ND |
2018-11-06 | 0.500 ppb |
2018-11-06 | 0.500 ppb |
2018-11-06 | 1.60 ppb |
2018-11-06 | 1.60 ppb |
2018-11-06 | 3.80 ppb |
2018-11-06 | 3.80 ppb |
2018-12-04 | 1.50 ppb |
2018-12-04 | 1.50 ppb |
2019-01-02 | 1.20 ppb |
2019-01-02 | 1.20 ppb |
2019-02-05 | 2.30 ppb |
2019-02-05 | 2.30 ppb |
2019-02-05 | 1.80 ppb |
2019-02-05 | 1.80 ppb |
2019-02-05 | 1.80 ppb |
2019-02-05 | 1.80 ppb |
2019-02-05 | ND |
2019-02-05 | ND |
2019-02-05 | ND |
2019-02-05 | ND |
2019-02-05 | 1.30 ppb |
2019-02-05 | 1.30 ppb |
2019-02-05 | 2.20 ppb |
2019-02-05 | 2.20 ppb |
2019-02-19 | 1.90 ppb |
2019-02-19 | 1.90 ppb |
2019-03-12 | 2.10 ppb |
2019-03-12 | 2.10 ppb |
2019-04-02 | 1.70 ppb |
2019-04-02 | 1.70 ppb |
2019-05-07 | 3.50 ppb |
2019-05-07 | 3.50 ppb |
2019-05-07 | 1.60 ppb |
2019-05-07 | 1.60 ppb |
2019-05-07 | 1.40 ppb |
2019-05-07 | 1.40 ppb |
2019-05-07 | ND |
2019-05-07 | ND |
2019-05-07 | ND |
2019-05-07 | ND |
2019-05-07 | 3.10 ppb |
2019-05-07 | 3.10 ppb |
2019-05-15 | 1.80 ppb |
2019-05-15 | 1.80 ppb |
2019-06-04 | 2.91 ppb |
2019-06-04 | 2.91 ppb |
2019-07-02 | 2.23 ppb |
2019-07-02 | 2.23 ppb |
2019-08-06 | 4.00 ppb |
2019-08-06 | 4.00 ppb |
2019-08-06 | 2.10 ppb |
2019-08-06 | 2.10 ppb |
2019-08-06 | 1.50 ppb |
2019-08-06 | 1.50 ppb |
2019-08-06 | ND |
2019-08-06 | ND |
2019-08-06 | ND |
2019-08-06 | ND |
2019-08-06 | 3.30 ppb |
2019-08-06 | 3.30 ppb |
2019-08-06 | 6.00 ppb |
2019-08-06 | 6.00 ppb |
2019-09-03 | 2.00 ppb |
2019-09-03 | 2.00 ppb |
2019-11-05 | 2.50 ppb |
2019-11-05 | 2.50 ppb |
2019-11-05 | 2.10 ppb |
2019-11-05 | 2.10 ppb |
2019-11-05 | 1.50 ppb |
2019-11-05 | 1.50 ppb |
2019-11-05 | ND |
2019-11-05 | ND |
2019-11-05 | ND |
2019-11-05 | ND |
2019-11-05 | 0.800 ppb |
2019-11-05 | 0.800 ppb |
2019-11-05 | 1.80 ppb |
2019-11-05 | 1.80 ppb |
2019-11-05 | 2.30 ppb |
2019-11-05 | 2.30 ppb |
2019-11-12 | 1.73 ppb |
2019-11-12 | 1.73 ppb |
2019-12-10 | ND |
2019-12-10 | ND |