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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Amherst, Town of

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

 

52

Samples

0

Samples exceeding legal limit (MCL)

18

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.113 ppb62ND - 0.420 ppb
20150.270 ppb85ND - 0.610 ppb
20160.323 ppb86ND - 0.760 ppb
20170.0524 ppb212ND - 0.600 ppb
20180.866 ppb53ND - 2.49 ppb
2019ND40ND

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
2014-01-061401431-08AND
2014-04-071404984-10AND
2014-07-301407W83-01A0.260 ppb
2014-10-071410861-04A0.420 ppb
2014-10-071410861-02AND
2014-10-281410V60-02AND
2015-01-0800281-REI CONSUL0.610 ppb
2015-01-0800281-REI CONSUL0.450 ppb
2015-04-0700281-REI CONSULND
2015-04-0700281-REI CONSULND
2015-07-0700281-REI CONSUL0.370 ppb
2015-07-0700281-REI CONSULND
2015-10-1300281-REI CONSUL0.370 ppb
2015-10-1300281-REI CONSUL0.360 ppb
2016-01-151601I18-02AND
2016-01-151601I18-04A0.290 ppb
2016-04-1316041678-02AND
2016-04-1316041678-04A0.290 ppb
2016-07-1216071179-04A0.760 ppb
2016-07-1216071179-02A0.360 ppb
2016-10-1116101249-02A0.360 ppb
2016-10-1116101249-04A0.520 ppb
2017-01-1217011338-04AND
2017-01-1217011338-02AND
2017-04-1417042026-04AND
2017-04-1417042026-02AND
2017-06-21E170503768ND
2017-06-21E170503765ND
2017-06-21E170503767ND
2017-06-21E170503766ND
2017-06-21E170503764ND
2017-06-21E170503763ND
2017-07-1317071661-04AND
2017-07-1317071661-02AND
2017-07-21E170700444ND
2017-07-21E1707004410.600 ppb
2017-07-21E1707004460.500 ppb
2017-07-21E170700445ND
2017-07-21E170700443ND
2017-07-21E170700442ND
2017-10-2617103369-04AND
2017-10-2617103369-06AND
2017-12-1417122174-01AND
2018-01-1118011331-07A2.49 ppb
2018-01-1118011331-09AND
2018-04-1218041605-01AND
2018-07-1218071678-02A1.10 ppb
2018-10-1618102215-04A0.740 ppb
2019-01-1719012027-06AND
2019-04-1819042376-06AND
2019-07-1819072548-14AND
2019-10-17734935008ND