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EWG's Tap Water Database — 2021 UPDATE

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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.

MORE ABOUT THIS CONTAMINANT

 

446

Samples

0

Samples exceeding legal limit (MCL)

336

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.52 ppb5234ND - 3.80 ppb
20152.32 ppb7658ND - 5.40 ppb
20162.07 ppb7658ND - 4.60 ppb
20172.23 ppb8060ND - 5.30 ppb
20181.89 ppb8670ND - 4.30 ppb
20191.70 ppb7658ND - 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
2014-01-14ND
2014-01-14ND
2014-01-14ND
2014-01-14ND
2014-01-143.50 ppb
2014-01-143.50 ppb
2014-02-041.50 ppb
2014-02-041.50 ppb
2014-02-042.70 ppb
2014-02-042.70 ppb
2014-03-042.00 ppb
2014-03-042.00 ppb
2014-04-013.30 ppb
2014-04-013.30 ppb
2014-05-061.70 ppb
2014-05-061.70 ppb
2014-05-06ND
2014-05-06ND
2014-05-062.20 ppb
2014-05-062.20 ppb
2014-05-131.90 ppb
2014-05-131.90 ppb
2014-06-031.90 ppb
2014-06-031.90 ppb
2014-07-011.70 ppb
2014-07-011.70 ppb
2014-08-052.70 ppb
2014-08-052.70 ppb
2014-08-062.00 ppb
2014-08-062.00 ppb
2014-08-06ND
2014-08-06ND
2014-08-062.20 ppb
2014-08-062.20 ppb
2014-09-022.20 ppb
2014-09-022.20 ppb
2014-09-03ND
2014-09-03ND
2014-10-14ND
2014-10-14ND
2014-10-14ND
2014-10-14ND
2014-10-14ND
2014-10-14ND
2014-10-14ND
2014-10-14ND
2014-11-043.80 ppb
2014-11-043.80 ppb
2014-11-042.50 ppb
2014-11-042.50 ppb
2014-12-021.60 ppb
2014-12-021.60 ppb
2015-01-13ND
2015-01-13ND
2015-01-13ND
2015-01-13ND
2015-01-133.70 ppb
2015-01-133.70 ppb
2015-02-033.00 ppb
2015-02-033.00 ppb
2015-02-032.90 ppb
2015-02-032.90 ppb
2015-02-032.30 ppb
2015-02-032.30 ppb
2015-02-032.30 ppb
2015-02-032.30 ppb
2015-02-033.70 ppb
2015-02-033.70 ppb
2015-03-032.60 ppb
2015-03-032.60 ppb
2015-04-072.70 ppb
2015-04-072.70 ppb
2015-04-22ND
2015-04-22ND
2015-04-22ND
2015-04-22ND
2015-04-222.10 ppb
2015-04-222.10 ppb
2015-05-053.90 ppb
2015-05-053.90 ppb
2015-05-053.70 ppb
2015-05-053.70 ppb
2015-05-052.80 ppb
2015-05-052.80 ppb
2015-05-054.60 ppb
2015-05-054.60 ppb
2015-05-053.60 ppb
2015-05-053.60 ppb
2015-06-032.50 ppb
2015-06-032.50 ppb
2015-07-071.90 ppb
2015-07-071.90 ppb
2015-08-043.30 ppb
2015-08-043.30 ppb
2015-08-043.50 ppb
2015-08-043.50 ppb
2015-08-042.60 ppb
2015-08-042.60 ppb
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-04ND
2015-08-042.00 ppb
2015-08-042.00 ppb
2015-08-04ND
2015-08-04ND
2015-09-012.00 ppb
2015-09-012.00 ppb
2015-10-071.60 ppb
2015-10-071.60 ppb
2015-11-033.90 ppb
2015-11-033.90 ppb
2015-11-034.00 ppb
2015-11-034.00 ppb
2015-11-034.00 ppb
2015-11-034.00 ppb
2015-11-03ND
2015-11-03ND
2015-11-03ND
2015-11-03ND
2015-11-035.40 ppb
2015-11-035.40 ppb
2015-11-032.50 ppb
2015-11-032.50 ppb
2015-11-033.60 ppb
2015-11-033.60 ppb
2015-12-091.60 ppb
2015-12-091.60 ppb
2016-01-064.40 ppb
2016-01-064.40 ppb
2016-02-022.70 ppb
2016-02-022.70 ppb
2016-02-022.30 ppb
2016-02-022.30 ppb
2016-02-022.20 ppb
2016-02-022.20 ppb
2016-02-02ND
2016-02-02ND
2016-02-02ND
2016-02-02ND
2016-02-021.000 ppb
2016-02-021.000 ppb
2016-02-023.80 ppb
2016-02-023.80 ppb
2016-02-024.10 ppb
2016-02-024.10 ppb
2016-03-012.40 ppb
2016-03-012.40 ppb
2016-04-133.00 ppb
2016-04-133.00 ppb
2016-05-032.90 ppb
2016-05-032.90 ppb
2016-05-032.50 ppb
2016-05-032.50 ppb
2016-05-031.70 ppb
2016-05-031.70 ppb
2016-05-03ND
2016-05-03ND
2016-05-03ND
2016-05-03ND
2016-05-033.20 ppb
2016-05-033.20 ppb
2016-05-034.30 ppb
2016-05-034.30 ppb
2016-06-082.60 ppb
2016-06-082.60 ppb
2016-07-062.20 ppb
2016-07-062.20 ppb
2016-08-022.80 ppb
2016-08-022.80 ppb
2016-08-024.60 ppb
2016-08-024.60 ppb
2016-08-021.60 ppb
2016-08-021.60 ppb
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-08-02ND
2016-08-021.90 ppb
2016-08-021.90 ppb
2016-08-02ND
2016-08-02ND
2016-09-071.90 ppb
2016-09-071.90 ppb
2016-10-042.10 ppb
2016-10-042.10 ppb
2016-11-012.90 ppb
2016-11-012.90 ppb
2016-11-013.20 ppb
2016-11-013.20 ppb
2016-11-013.00 ppb
2016-11-013.00 ppb
2016-11-01ND
2016-11-01ND
2016-11-01ND
2016-11-01ND
2016-11-012.30 ppb
2016-11-012.30 ppb
2016-11-011.60 ppb
2016-11-011.60 ppb
2016-11-013.30 ppb
2016-11-013.30 ppb
2016-12-062.30 ppb
2016-12-062.30 ppb
2017-01-102.90 ppb
2017-01-102.90 ppb
2017-02-082.70 ppb
2017-02-082.70 ppb
2017-02-082.00 ppb
2017-02-082.00 ppb
2017-02-082.10 ppb
2017-02-082.10 ppb
2017-02-08ND
2017-02-08ND
2017-02-08ND
2017-02-08ND
2017-02-083.00 ppb
2017-02-083.00 ppb
2017-02-082.40 ppb
2017-02-082.40 ppb
2017-03-072.50 ppb
2017-03-072.50 ppb
2017-04-054.30 ppb
2017-04-054.30 ppb
2017-05-033.60 ppb
2017-05-033.60 ppb
2017-05-032.50 ppb
2017-05-032.50 ppb
2017-05-031.80 ppb
2017-05-031.80 ppb
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-03ND
2017-05-032.30 ppb
2017-05-032.30 ppb
2017-05-032.50 ppb
2017-05-032.50 ppb
2017-05-034.90 ppb
2017-05-034.90 ppb
2017-06-075.30 ppb
2017-06-075.30 ppb
2017-07-053.00 ppb
2017-07-053.00 ppb
2017-08-012.20 ppb
2017-08-012.20 ppb
2017-08-093.30 ppb
2017-08-093.30 ppb
2017-08-092.30 ppb
2017-08-092.30 ppb
2017-08-091.70 ppb
2017-08-091.70 ppb
2017-08-09ND
2017-08-09ND
2017-08-09ND
2017-08-09ND
2017-08-092.00 ppb
2017-08-092.00 ppb
2017-08-093.00 ppb
2017-08-093.00 ppb
2017-09-051.90 ppb
2017-09-051.90 ppb
2017-10-03ND
2017-10-03ND
2017-11-083.70 ppb
2017-11-083.70 ppb
2017-11-083.60 ppb
2017-11-083.60 ppb
2017-11-083.40 ppb
2017-11-083.40 ppb
2017-11-08ND
2017-11-08ND
2017-11-084.20 ppb
2017-11-084.20 ppb
2017-11-08ND
2017-11-08ND
2017-11-083.10 ppb
2017-11-083.10 ppb
2017-11-083.20 ppb
2017-11-083.20 ppb
2017-11-08ND
2017-11-08ND
2017-12-053.70 ppb
2017-12-053.70 ppb
2018-01-033.20 ppb
2018-01-033.20 ppb
2018-02-062.30 ppb
2018-02-062.30 ppb
2018-02-061.80 ppb
2018-02-061.80 ppb
2018-02-061.70 ppb
2018-02-061.70 ppb
2018-02-061.70 ppb
2018-02-061.70 ppb
2018-02-08ND
2018-02-08ND
2018-02-08ND
2018-02-08ND
2018-02-082.90 ppb
2018-02-082.90 ppb
2018-03-122.50 ppb
2018-03-122.50 ppb
2018-04-033.80 ppb
2018-04-033.80 ppb
2018-05-013.70 ppb
2018-05-013.70 ppb
2018-05-013.70 ppb
2018-05-013.70 ppb
2018-05-014.10 ppb
2018-05-014.10 ppb
2018-05-011.70 ppb
2018-05-011.70 ppb
2018-05-014.30 ppb
2018-05-014.30 ppb
2018-05-08ND
2018-05-08ND
2018-05-08ND
2018-05-08ND
2018-05-082.10 ppb
2018-05-082.10 ppb
2018-06-051.70 ppb
2018-06-051.70 ppb
2018-07-10ND
2018-07-10ND
2018-07-10ND
2018-07-10ND
2018-07-100.780 ppb
2018-07-100.780 ppb
2018-07-102.00 ppb
2018-07-102.00 ppb
2018-07-172.70 ppb
2018-07-172.70 ppb
2018-07-172.40 ppb
2018-07-172.40 ppb
2018-07-171.50 ppb
2018-07-171.50 ppb
2018-07-171.50 ppb
2018-07-171.50 ppb
2018-08-071.50 ppb
2018-08-071.50 ppb
2018-09-042.10 ppb
2018-09-042.10 ppb
2018-09-243.10 ppb
2018-09-243.10 ppb
2018-09-242.40 ppb
2018-09-242.40 ppb
2018-09-241.10 ppb
2018-09-241.10 ppb
2018-09-243.20 ppb
2018-09-243.20 ppb
2018-10-022.90 ppb
2018-10-022.90 ppb
2018-11-063.30 ppb
2018-11-063.30 ppb
2018-11-061.20 ppb
2018-11-061.20 ppb
2018-11-061.10 ppb
2018-11-061.10 ppb
2018-11-06ND
2018-11-06ND
2018-11-06ND
2018-11-06ND
2018-11-060.500 ppb
2018-11-060.500 ppb
2018-11-061.60 ppb
2018-11-061.60 ppb
2018-11-063.80 ppb
2018-11-063.80 ppb
2018-12-041.50 ppb
2018-12-041.50 ppb
2019-01-021.20 ppb
2019-01-021.20 ppb
2019-02-052.30 ppb
2019-02-052.30 ppb
2019-02-051.80 ppb
2019-02-051.80 ppb
2019-02-051.80 ppb
2019-02-051.80 ppb
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-02-05ND
2019-02-051.30 ppb
2019-02-051.30 ppb
2019-02-052.20 ppb
2019-02-052.20 ppb
2019-02-191.90 ppb
2019-02-191.90 ppb
2019-03-122.10 ppb
2019-03-122.10 ppb
2019-04-021.70 ppb
2019-04-021.70 ppb
2019-05-073.50 ppb
2019-05-073.50 ppb
2019-05-071.60 ppb
2019-05-071.60 ppb
2019-05-071.40 ppb
2019-05-071.40 ppb
2019-05-07ND
2019-05-07ND
2019-05-07ND
2019-05-07ND
2019-05-073.10 ppb
2019-05-073.10 ppb
2019-05-151.80 ppb
2019-05-151.80 ppb
2019-06-042.91 ppb
2019-06-042.91 ppb
2019-07-022.23 ppb
2019-07-022.23 ppb
2019-08-064.00 ppb
2019-08-064.00 ppb
2019-08-062.10 ppb
2019-08-062.10 ppb
2019-08-061.50 ppb
2019-08-061.50 ppb
2019-08-06ND
2019-08-06ND
2019-08-06ND
2019-08-06ND
2019-08-063.30 ppb
2019-08-063.30 ppb
2019-08-066.00 ppb
2019-08-066.00 ppb
2019-09-032.00 ppb
2019-09-032.00 ppb
2019-11-052.50 ppb
2019-11-052.50 ppb
2019-11-052.10 ppb
2019-11-052.10 ppb
2019-11-051.50 ppb
2019-11-051.50 ppb
2019-11-05ND
2019-11-05ND
2019-11-05ND
2019-11-05ND
2019-11-050.800 ppb
2019-11-050.800 ppb
2019-11-051.80 ppb
2019-11-051.80 ppb
2019-11-052.30 ppb
2019-11-052.30 ppb
2019-11-121.73 ppb
2019-11-121.73 ppb
2019-12-10ND
2019-12-10ND