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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Connecticut Water Company - Shoreline Region-chester System

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

 

60

Samples

0

Samples exceeding legal limit (MCL)

57

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20148.21 ppb109ND - 13.0 ppb
20157.71 ppb109ND - 11.0 ppb
20169.43 ppb10104.40 ppb - 16.0 ppb
20179.78 ppb10100.740 ppb - 15.0 ppb
20189.50 ppb10100.500 ppb - 14.4 ppb
20198.52 ppb109ND - 10.2 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.06 ppb

The EWG Health Guideline of 0.06 ppb for bromodichloromethane 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
2014-01-29140130CWCAVOC1ND
2014-03-213486THM6.60 ppb
2014-03-213487THM9.10 ppb
2014-05-146604VOC10.600 ppb
2014-06-188762THM9.60 ppb
2014-06-188763THM8.30 ppb
2014-09-15BH14105TTHM12.0 ppb
2014-09-15BH14106TTHM13.0 ppb
2014-12-17BH54712TTHM9.90 ppb
2014-12-17BH54713TTHM13.0 ppb
2015-02-12BH73176VOC14.50 ppb
2015-03-11BH82214TTHM6.60 ppb
2015-03-11BH82213TTHM6.10 ppb
2015-06-16BJ31720TTHM9.80 ppb
2015-06-16BJ31719TTHM8.90 ppb
2015-06-17BJ32481VOC1ND
2015-09-15BJ92118TTHM11.0 ppb
2015-09-15BJ92117TTHM11.0 ppb
2015-12-08BK34308TTHM10.00 ppb
2015-12-08BK34307TTHM9.20 ppb
2016-02-11BK64356VOC16.00 ppb
2016-03-15BK78694TTHM8.90 ppb
2016-03-15BK78695TTHM7.60 ppb
2016-05-25BN40398VOC14.40 ppb
2016-06-14BN54614TTHM8.60 ppb
2016-06-14BN54615TTHM8.20 ppb
2016-09-14BV14926TTHM14.0 ppb
2016-09-14BV14927TTHM16.0 ppb
2016-12-15BX06132TTHM11.0 ppb
2016-12-15BX06133TTHM9.60 ppb
2017-01-18BX33133VOC16.60 ppb
2017-03-17BX89075TTHM8.00 ppb
2017-03-17BX89074TTHM11.0 ppb
2017-06-19BY42244TTHM9.80 ppb
2017-06-19BY42245TTHM8.70 ppb
2017-09-14BZ02391TTHM14.0 ppb
2017-09-14BZ02392TTHM12.0 ppb
2017-11-15BZ42288VOC10.740 ppb
2017-12-14BZ60235TTHM15.0 ppb
2017-12-14BZ60236TTHM12.0 ppb
2018-03-15CA03070TTHM12.0 ppb
2018-03-15CA03071TTHM8.80 ppb
2018-03-30CA11467VOC17.50 ppb
2018-06-26CA80049TTHM9.90 ppb
2018-06-26CA80050TTHM8.10 ppb
2018-09-13VOC1 2005052770.500 ppb
2018-09-24DBP 20050669614.4 ppb
2018-09-24DBP 20050669812.1 ppb
2018-12-21DBP 2005167919.80 ppb
2018-12-21DBP 20051686211.9 ppb
2019-03-11VOC1 2005242956.80 ppb
2019-03-12DBP 2005243489.40 ppb
2019-03-12DBP 20052434910.2 ppb
2019-06-14DBP 2005366669.70 ppb
2019-06-14DBP 20053667110.2 ppb
2019-06-24VOC1 200538201ND
2019-09-17DBP 2005494829.60 ppb
2019-09-17DBP 2005494838.90 ppb
2019-12-10DBP 20055964010.2 ppb
2019-12-10DBP 20055964110.2 ppb