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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

Chester Water Authority

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

 

192

Samples

0

Samples exceeding legal limit (MCL)

73

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20141.10 ppb3231ND - 2.50 ppb
20150.610 ppb3216ND - 1.90 ppb
20160.929 ppb3218ND - 3.10 ppb
2017ND320ND
2018ND320ND
20190.291 ppb328ND - 1.60 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
2014-02-0714021709-0020.900 ppb
2014-02-0714021709-0010.800 ppb
2014-02-0714021709-0050.800 ppb
2014-02-0714021709-0060.800 ppb
2014-02-0714021709-0080.900 ppb
2014-02-0714021709-0070.800 ppb
2014-02-0714021709-0040.800 ppb
2014-02-1114021709-0030.700 ppb
2014-05-1214052890-0020.800 ppb
2014-05-1214052890-0010.600 ppb
2014-05-1214052890-0050.600 ppb
2014-05-1214052890-0060.800 ppb
2014-05-1214052890-0080.800 ppb
2014-05-1214052890-0070.700 ppb
2014-05-1214052890-0040.600 ppb
2014-05-1314052890-003ND
2014-08-1114081686-0022.50 ppb
2014-08-1114081686-0012.30 ppb
2014-08-1114081686-0052.10 ppb
2014-08-1114081686-0062.40 ppb
2014-08-1114081686-0082.50 ppb
2014-08-1114081686-0072.40 ppb
2014-08-1114081686-0042.00 ppb
2014-08-1214081686-0032.50 ppb
2014-11-0714110723-0030.700 ppb
2014-11-0714110723-0020.700 ppb
2014-11-0714110723-0010.500 ppb
2014-11-0714110723-0050.600 ppb
2014-11-0714110723-0060.600 ppb
2014-11-0714110723-0080.600 ppb
2014-11-0714110723-0070.700 ppb
2014-11-0714110723-0040.700 ppb
2015-02-1112399425ND
2015-02-1112399419ND
2015-02-1112399413ND
2015-02-1112399437ND
2015-02-1112399443ND
2015-02-1112399455ND
2015-02-1112399449ND
2015-02-1112399431ND
2015-05-0712747579ND
2015-05-0712747573ND
2015-05-0712747567ND
2015-05-0712747591ND
2015-05-0712747597ND
2015-05-0712747609ND
2015-05-0712747603ND
2015-05-0712747585ND
2015-08-12131335791.50 ppb
2015-08-12131335731.60 ppb
2015-08-12131335671.80 ppb
2015-08-12131335911.60 ppb
2015-08-12131335971.90 ppb
2015-08-12131336091.90 ppb
2015-08-12131336031.70 ppb
2015-08-12131335851.50 ppb
2015-11-09135121630.680 ppb
2015-11-09135121570.850 ppb
2015-11-09135121750.780 ppb
2015-11-09135121810.630 ppb
2015-11-09135121930.800 ppb
2015-11-09135121870.680 ppb
2015-11-09135121690.910 ppb
2015-11-12135121990.680 ppb
2016-02-0813868224ND
2016-02-0813868218ND
2016-02-0813868242ND
2016-02-0813868248ND
2016-02-0813868260ND
2016-02-0813868254ND
2016-02-0813868236ND
2016-02-0913868230ND
2016-05-10142482260.740 ppb
2016-05-10142482680.540 ppb
2016-05-10142482500.690 ppb
2016-05-10142482620.530 ppb
2016-05-1014248244ND
2016-05-10142482310.710 ppb
2016-05-10142482380.500 ppb
2016-05-10142482540.530 ppb
2016-08-09147327312.90 ppb
2016-08-09147327733.00 ppb
2016-08-09147327612.80 ppb
2016-08-09147327372.90 ppb
2016-08-09147327492.90 ppb
2016-08-09147327433.10 ppb
2016-08-09147327552.90 ppb
2016-08-09147327673.00 ppb
2016-11-0915223841ND
2016-11-09152238170.680 ppb
2016-11-09152238350.670 ppb
2016-11-0915223805ND
2016-11-0915223823ND
2016-11-0915223811ND
2016-11-0915223799ND
2016-11-09152238290.650 ppb
2017-02-0715652746ND
2017-02-0715652764ND
2017-02-0715652770ND
2017-02-0715652776ND
2017-02-0715652752ND
2017-02-0715652758ND
2017-02-0715652782ND
2017-02-2715652789ND
2017-05-0916091664ND
2017-05-0916091669ND
2017-05-0916091639ND
2017-05-0916091649ND
2017-05-0916091644ND
2017-05-0916091654ND
2017-05-0916091659ND
2017-05-1016091674ND
2017-08-0916562821ND
2017-08-0916562839ND
2017-08-0916562857ND
2017-08-0916562833ND
2017-08-0916562851ND
2017-08-0916562864ND
2017-08-0916562846ND
2017-08-0916562828ND
2017-11-0817020816ND
2017-11-0817020792ND
2017-11-0817020810ND
2017-11-0817020822ND
2017-11-0817020786ND
2017-11-0817020828ND
2017-11-0817020804ND
2017-11-0817020798ND
2018-02-082294360003ND
2018-02-082294360002ND
2018-02-082294360001ND
2018-02-082294360005ND
2018-02-082294360006ND
2018-02-082294360008ND
2018-02-082294360007ND
2018-02-082294360004ND
2018-05-082314159003ND
2018-05-082314159002ND
2018-05-082314159001ND
2018-05-082314159005ND
2018-05-082314159006ND
2018-05-082314159008ND
2018-05-082314159007ND
2018-05-082314159004ND
2018-08-102331907003ND
2018-08-102331907002ND
2018-08-102331907001ND
2018-08-102331907005ND
2018-08-102331907006ND
2018-08-102331907008ND
2018-08-102331907007ND
2018-08-102331907004ND
2018-11-072349357003ND
2018-11-072349357002ND
2018-11-072349357001ND
2018-11-072349357006ND
2018-11-072349357008ND
2018-11-072349357007ND
2018-11-072349357004ND
2018-11-082349357005ND
2019-02-123016801003ND
2019-02-123016801002ND
2019-02-123016801001ND
2019-02-123016801005ND
2019-02-123016801006ND
2019-02-123016801008ND
2019-02-123016801007ND
2019-02-123016801004ND
2019-05-163034622003ND
2019-05-163034622002ND
2019-05-163034622001ND
2019-05-163034622005ND
2019-05-163034622006ND
2019-05-163034622008ND
2019-05-163034622007ND
2019-05-163034622004ND
2019-08-0730509260031.000 ppb
2019-08-0730509260021.20 ppb
2019-08-0730509260011.10 ppb
2019-08-0730509260051.10 ppb
2019-08-0730509260071.20 ppb
2019-08-0730509260061.000 ppb
2019-08-0730509260041.10 ppb
2019-08-1230515280011.60 ppb
2019-11-073068994003ND
2019-11-073068994002ND
2019-11-073068994001ND
2019-11-073068994005ND
2019-11-073068994006ND
2019-11-073068994008ND
2019-11-073068994007ND
2019-11-073068994004ND