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EWG's Tap Water Database — 2019 UPDATE

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Dibromochloromethane

San Antonio Water System Northeast

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.

 

107

Samples

0

Samples exceeding legal limit (MCL)

99

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20124.03 ppb1916ND - 24.4 ppb
20133.36 ppb17172.50 ppb - 5.30 ppb
20143.11 ppb17171.10 ppb - 4.90 ppb
20154.13 ppb20201.60 ppb - 9.10 ppb
20161.56 ppb1613ND - 3.60 ppb
20172.31 ppb1816ND - 7.10 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
2012-01-0412010700013.20 ppb
2012-01-0412010700023.10 ppb
2012-01-0412010700033.20 ppb
2012-01-0412010700043.20 ppb
2012-05-2112056650083.84 ppb
2012-05-211205665010ND
2012-05-21120566501210.2 ppb
2012-05-2112056650141.90 ppb
2012-05-2112056650155.40 ppb
2012-05-2112056650161.20 ppb
2012-05-2112056650172.10 ppb
2012-07-0612072170011.20 ppb
2012-07-0612072170023.90 ppb
2012-07-061207217003ND
2012-07-061207217004ND
2012-10-0212101000014.00 ppb
2012-10-0212101000024.30 ppb
2012-10-0212101000031.50 ppb
2012-10-02121010000424.4 ppb
2013-02-05AC098063.00 ppb
2013-02-05AC098103.60 ppb
2013-02-05AC098142.80 ppb
2013-02-05AC098023.70 ppb
2013-04-09AC160883.40 ppb
2013-04-09AC160893.10 ppb
2013-04-09AC160933.30 ppb
2013-04-09AC160903.50 ppb
2013-07-02AC237572.80 ppb
2013-07-02AC237533.50 ppb
2013-07-02AC237612.50 ppb
2013-07-02AC237543.30 ppb
2013-11-21AC358485.30 ppb
2013-12-26AC382203.10 ppb
2013-12-26AC382213.50 ppb
2013-12-26AC382183.50 ppb
2013-12-26AC382193.30 ppb
2014-02-14AC431002.90 ppb
2014-02-14AC431063.30 ppb
2014-02-14AC430443.00 ppb
2014-02-14AC430482.80 ppb
2014-04-02AC491243.30 ppb
2014-04-02AC490954.20 ppb
2014-04-02AC490854.40 ppb
2014-04-02AC491063.40 ppb
2014-07-02AC587672.80 ppb
2014-07-02AC587643.50 ppb
2014-07-02AC587742.80 ppb
2014-07-02AC587754.90 ppb
2014-09-02AC654513.70 ppb
2014-10-02AC687931.40 ppb
2014-10-02AC687944.00 ppb
2014-10-02AC687901.30 ppb
2014-10-02AC687671.10 ppb
2015-01-15AC764201.90 ppb
2015-01-15AC764442.40 ppb
2015-01-15AC764432.50 ppb
2015-01-15AC764292.20 ppb
2015-05-01AC902342.40 ppb
2015-05-01AC902543.10 ppb
2015-05-01AC902483.00 ppb
2015-05-01AC902493.10 ppb
2015-07-08AC987492.40 ppb
2015-07-08AC987537.20 ppb
2015-07-08AC987472.60 ppb
2015-07-08AC987061.60 ppb
2015-07-08AC987103.90 ppb
2015-07-08AC987095.80 ppb
2015-07-08AC987084.20 ppb
2015-07-09AC989962.80 ppb
2015-10-14AD105985.00 ppb
2015-10-14AD105919.10 ppb
2015-10-14AD105868.60 ppb
2015-10-14AD105998.80 ppb
2016-01-12AD175591.20 ppb
2016-01-12AD175632.10 ppb
2016-01-12AD175331.30 ppb
2016-01-12AD17532ND
2016-04-04AD316351.20 ppb
2016-04-04AD316392.40 ppb
2016-04-04AD316342.00 ppb
2016-04-04AD31636ND
2016-07-20AD448801.90 ppb
2016-07-20AD448751.20 ppb
2016-07-20AD448702.60 ppb
2016-07-20AD448782.00 ppb
2016-10-12AD531182.30 ppb
2016-10-12AD53120ND
2016-10-12AD531193.60 ppb
2016-10-12AD531351.20 ppb
2017-01-05AD631921.60 ppb
2017-01-05AD631961.10 ppb
2017-01-05AD631903.30 ppb
2017-01-05AD631931.20 ppb
2017-04-03AD780361.50 ppb
2017-04-03AD78034ND
2017-04-03AD780372.90 ppb
2017-04-03AD780392.10 ppb
2017-07-07AD886531.20 ppb
2017-07-07AD88636ND
2017-07-07AD886373.40 ppb
2017-07-07AD886303.00 ppb
2017-12-04AE065456.20 ppb
2017-12-04AE065371.20 ppb
2017-12-04AE065427.10 ppb
2017-12-04AE065432.60 ppb
2017-12-04AE065782.20 ppb
2017-12-13AE076741.000 ppb