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EWG's Tap Water Database — 2021 UPDATE

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Bromoform

Concord 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

 

226

Samples

0

Samples exceeding legal limit (MCL)

130

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.86 ppb228ND - 5.50 ppb
20151.51 ppb4628ND - 4.40 ppb
20161.56 ppb4628ND - 5.40 ppb
20170.807 ppb208ND - 3.80 ppb
20182.70 ppb4630ND - 8.50 ppb
20191.84 ppb4628ND - 7.06 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
2014-02-045.50 ppb
2014-02-045.50 ppb
2014-05-054.90 ppb
2014-05-054.90 ppb
2014-07-01ND
2014-07-01ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-15ND
2014-07-28ND
2014-07-28ND
2014-08-044.80 ppb
2014-08-044.80 ppb
2014-08-13ND
2014-08-13ND
2014-08-25ND
2014-08-25ND
2014-11-045.30 ppb
2014-11-045.30 ppb
2015-02-042.60 ppb
2015-02-042.60 ppb
2015-02-041.50 ppb
2015-02-041.50 ppb
2015-02-041.40 ppb
2015-02-041.40 ppb
2015-02-042.20 ppb
2015-02-042.20 ppb
2015-05-044.40 ppb
2015-05-044.40 ppb
2015-05-043.60 ppb
2015-05-043.60 ppb
2015-05-040.540 ppb
2015-05-040.540 ppb
2015-05-043.40 ppb
2015-05-043.40 ppb
2015-07-01ND
2015-07-01ND
2015-07-15ND
2015-07-15ND
2015-07-16ND
2015-07-16ND
2015-07-16ND
2015-07-16ND
2015-07-23ND
2015-07-23ND
2015-08-034.30 ppb
2015-08-034.30 ppb
2015-08-03ND
2015-08-03ND
2015-08-032.60 ppb
2015-08-032.60 ppb
2015-08-03ND
2015-08-03ND
2015-09-14ND
2015-09-14ND
2015-09-29ND
2015-09-29ND
2015-11-030.900 ppb
2015-11-030.900 ppb
2015-11-031.30 ppb
2015-11-031.30 ppb
2015-11-032.00 ppb
2015-11-032.00 ppb
2015-11-033.90 ppb
2015-11-033.90 ppb
2016-02-090.700 ppb
2016-02-090.700 ppb
2016-02-091.10 ppb
2016-02-091.10 ppb
2016-02-091.60 ppb
2016-02-091.60 ppb
2016-02-090.800 ppb
2016-02-090.800 ppb
2016-05-044.40 ppb
2016-05-044.40 ppb
2016-05-042.00 ppb
2016-05-042.00 ppb
2016-05-042.10 ppb
2016-05-042.10 ppb
2016-05-042.90 ppb
2016-05-042.90 ppb
2016-07-26ND
2016-07-26ND
2016-08-085.30 ppb
2016-08-085.30 ppb
2016-08-08ND
2016-08-08ND
2016-08-083.10 ppb
2016-08-083.10 ppb
2016-08-08ND
2016-08-08ND
2016-08-10ND
2016-08-10ND
2016-08-18ND
2016-08-18ND
2016-08-25ND
2016-08-25ND
2016-08-25ND
2016-08-25ND
2016-09-13ND
2016-09-13ND
2016-09-29ND
2016-09-29ND
2016-11-085.40 ppb
2016-11-085.40 ppb
2016-11-081.70 ppb
2016-11-081.70 ppb
2016-11-081.50 ppb
2016-11-081.50 ppb
2016-11-083.30 ppb
2016-11-083.30 ppb
2017-02-073.80 ppb
2017-02-073.80 ppb
2017-02-071.50 ppb
2017-02-071.50 ppb
2017-02-070.670 ppb
2017-02-070.670 ppb
2017-02-072.10 ppb
2017-02-072.10 ppb
2017-07-03ND
2017-07-03ND
2017-07-31ND
2017-07-31ND
2017-08-14ND
2017-08-14ND
2017-08-25ND
2017-08-25ND
2017-08-28ND
2017-08-28ND
2017-09-18ND
2017-09-18ND
2018-02-067.60 ppb
2018-02-067.60 ppb
2018-02-062.50 ppb
2018-02-062.50 ppb
2018-02-062.80 ppb
2018-02-062.80 ppb
2018-02-062.70 ppb
2018-02-062.70 ppb
2018-05-085.50 ppb
2018-05-085.50 ppb
2018-05-083.60 ppb
2018-05-083.60 ppb
2018-05-083.40 ppb
2018-05-083.40 ppb
2018-05-082.80 ppb
2018-05-082.80 ppb
2018-07-11ND
2018-07-11ND
2018-07-16ND
2018-07-16ND
2018-07-25ND
2018-07-25ND
2018-07-26ND
2018-07-26ND
2018-07-26ND
2018-07-26ND
2018-08-068.50 ppb
2018-08-068.50 ppb
2018-08-06ND
2018-08-06ND
2018-08-064.10 ppb
2018-08-064.10 ppb
2018-08-060.800 ppb
2018-08-060.800 ppb
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-11-067.90 ppb
2018-11-067.90 ppb
2018-11-062.20 ppb
2018-11-062.20 ppb
2018-11-064.50 ppb
2018-11-064.50 ppb
2018-11-063.20 ppb
2018-11-063.20 ppb
2019-02-055.50 ppb
2019-02-055.50 ppb
2019-02-051.50 ppb
2019-02-051.50 ppb
2019-02-050.950 ppb
2019-02-050.950 ppb
2019-02-051.80 ppb
2019-02-051.80 ppb
2019-05-074.76 ppb
2019-05-074.76 ppb
2019-05-071.69 ppb
2019-05-071.69 ppb
2019-05-07ND
2019-05-07ND
2019-05-072.27 ppb
2019-05-072.27 ppb
2019-07-01ND
2019-07-01ND
2019-07-01ND
2019-07-01ND
2019-07-03ND
2019-07-03ND
2019-07-11ND
2019-07-11ND
2019-07-26ND
2019-07-26ND
2019-07-31ND
2019-07-31ND
2019-09-047.06 ppb
2019-09-047.06 ppb
2019-09-04ND
2019-09-04ND
2019-09-045.38 ppb
2019-09-045.38 ppb
2019-09-041.20 ppb
2019-09-041.20 ppb
2019-09-18ND
2019-09-18ND
2019-11-055.32 ppb
2019-11-055.32 ppb
2019-11-051.42 ppb
2019-11-051.42 ppb
2019-11-050.810 ppb
2019-11-050.810 ppb
2019-11-052.60 ppb
2019-11-052.60 ppb