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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Zone 7 Water Agency

Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane 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

 

88

Samples

0

Samples exceeding legal limit (MCL)

28

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20146.72 ppb197ND - 25.1 ppb
20158.10 ppb104ND - 32.9 ppb
20167.58 ppb84ND - 18.7 ppb
20170.589 ppb93ND - 2.10 ppb
20182.15 ppb154ND - 9.10 ppb
20191.00 ppb276ND - 14.6 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.1 ppb

The EWG Health Guideline of 0.1 ppb for dibromochloromethane 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 Lab ID Result
2014-03-245100-001-100023.9 ppb
2014-03-245100-008-104525.1 ppb
2014-06-095100-001-100021.5 ppb
2014-06-105100-005-1000ND
2014-06-105100-011-1040ND
2014-06-115100-013-0930ND
2014-06-115100-006-0825ND
2014-06-165100-007-0910ND
2014-06-175100-012-1125ND
2014-06-195100-019-0935ND
2014-09-085100-008-104311.8 ppb
2014-09-085100-006-1150ND
2014-09-085100-001-084018.0 ppb
2014-09-095100-007-0930ND
2014-09-105100-005-0830ND
2014-09-105100-011-0800ND
2014-11-139590-017-0905ND
2014-12-085100-008-104512.6 ppb
2014-12-085100-001-090514.8 ppb
2015-03-039590-017-0825ND
2015-06-225100-001-110016.4 ppb
2015-06-225100-008-084532.9 ppb
2015-06-245100-019-0845ND
2015-06-255100-017-0955ND
2015-06-265100-007-0930ND
2015-06-265100-005-0905ND
2015-09-085100-001-093013.0 ppb
2015-09-085100-008-103018.7 ppb
2015-09-105100-017-0910ND
2016-07-115100-008-101018.7 ppb
2016-07-115100-001-092013.0 ppb
2016-07-115100-007-1220ND
2016-07-135100-017-1035ND
2016-07-135100-019-0920ND
2016-10-105100-008-093016.0 ppb
2016-10-105100-001-091512.9 ppb
2016-10-135100-012-1400ND
2017-04-105100-001-09101.20 ppb
2017-04-125100-017-1110ND
2017-07-105100-019-1135ND
2017-07-105100-007-1010ND
2017-07-115100-017-1210ND
2017-07-115100-001-09352.10 ppb
2017-07-115100-008-09552.00 ppb
2017-07-125100-012-0900ND
2017-07-135100-013-0915ND
2018-04-095100-008-10208.60 ppb
2018-04-095100-001-11377.70 ppb
2018-04-095100-017-1035ND
2018-04-105100-005-1240ND
2018-04-105100-019-0925ND
2018-04-105100-011-1215ND
2018-04-115100-013-0940ND
2018-04-115100-006-1110ND
2018-04-115100-012-1040ND
2018-10-085100-008-09559.10 ppb
2018-10-085100-001-08256.80 ppb
2018-10-085100-019-1140ND
2018-10-085100-012-1200ND
2018-10-095100-017-0900ND
2018-10-105100-007-1435ND
2019-01-075100-005-1215ND
2019-01-075100-012-1100ND
2019-01-075100-008-101714.6 ppb
2019-01-075100-017-1025ND
2019-01-075100-020-1150ND
2019-01-085100-011-1015ND
2019-01-085100-007-0910ND
2019-01-085100-019-0940ND
2019-04-085100-007-1130ND
2019-04-085100-008-09251.80 ppb
2019-04-085100-017-0916ND
2019-04-095100-019-1040ND
2019-04-095100-012-0935ND
2019-04-095100-006-0920ND
2019-04-095100-013-0955ND
2019-07-085100-013-1015ND
2019-07-085100-007-0950ND
2019-07-085100-005-1015ND
2019-07-085100-011-0945ND
2019-07-085100-020-1130ND
2019-07-095100-006-1145ND
2019-07-095100-019-1045ND
2019-07-095100-017-0925ND
2019-07-105100-001-10102.20 ppb
2019-07-105100-008-11152.60 ppb
2019-10-075100-001-13252.80 ppb
2019-10-075100-008-12103.10 ppb