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EWG's Tap Water Database — 2019 UPDATE

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Bromoform

City of Brighton

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.

 

60

Samples

0

Samples exceeding legal limit (MCL)

58

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20123.99 ppb76ND - 6.90 ppb
20134.58 ppb11111.000 ppb - 12.3 ppb
2014N/A00N/A
20157.82 ppb12123.80 ppb - 15.7 ppb
20165.49 ppb1413ND - 16.3 ppb
20177.39 ppb16160.600 ppb - 18.8 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
2012-02-272.00 ppb
2012-05-096.90 ppb
2012-06-294.60 ppb
2012-08-166.10 ppb
2012-09-17ND
2012-09-174.10 ppb
2012-10-164.20 ppb
2013-03-181.30 ppb
2013-03-181.30 ppb
2013-03-181.000 ppb
2013-04-123.40 ppb
2013-04-122.70 ppb
2013-05-133.00 ppb
2013-05-135.40 ppb
2013-06-126.90 ppb
2013-07-087.80 ppb
2013-07-085.30 ppb
2013-09-3012.3 ppb
2015-04-133.80 ppb
2015-04-134.40 ppb
2015-04-134.60 ppb
2015-04-136.60 ppb
2015-07-096.60 ppb
2015-07-0914.9 ppb
2015-07-096.80 ppb
2015-07-097.60 ppb
2015-10-0615.7 ppb
2015-10-065.00 ppb
2015-10-067.60 ppb
2015-10-0610.2 ppb
2016-01-110.600 ppb
2016-01-114.60 ppb
2016-01-11ND
2016-01-111.20 ppb
2016-04-133.40 ppb
2016-04-133.40 ppb
2016-07-183.90 ppb
2016-07-185.50 ppb
2016-07-186.10 ppb
2016-07-1816.3 ppb
2016-10-1212.6 ppb
2016-10-127.50 ppb
2016-10-126.20 ppb
2016-10-125.60 ppb
2017-01-1310.6 ppb
2017-01-130.600 ppb
2017-01-130.800 ppb
2017-01-130.700 ppb
2017-04-216.00 ppb
2017-04-215.20 ppb
2017-04-216.40 ppb
2017-04-2112.9 ppb
2017-07-1110.2 ppb
2017-07-117.10 ppb
2017-07-117.60 ppb
2017-07-1115.2 ppb
2017-10-043.70 ppb
2017-10-045.50 ppb
2017-10-047.00 ppb
2017-10-0418.8 ppb