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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

CTWC - Unionville System

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

 

165

Samples

0

Samples exceeding legal limit (MCL)

52

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.318 ppb4311ND - 1.90 ppb
20150.233 ppb315ND - 3.50 ppb
20160.526 ppb309ND - 4.70 ppb
20170.894 ppb2411ND - 4.20 ppb
20180.447 ppb196ND - 3.20 ppb
20191.04 ppb1810ND - 4.70 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
2014-01-21BG01724VOC1ND
2014-01-22BG01725VOC1ND
2014-01-22BG01726VOC1ND
2014-01-22BG017276VOC1ND
2014-01-22BG01727VOC1ND
2014-01-22BG01728VOC1ND
2014-01-22BG02299TTHM1.90 ppb
2014-01-23BG02294TTHM1.40 ppb
2014-01-23BG02295TTHMND
2014-01-23BG02296TTHM1.20 ppb
2014-01-23BG02297TTHM1.20 ppb
2014-01-23BG02298TTHM1.60 ppb
2014-01-23BG02300TTHM1.50 ppb
2014-01-31BG02295THMND
2014-01-31BG06715TTHMND
2014-01-31BG06716TTHMND
2014-01-31BG06717TTHM1.40 ppb
2014-01-31BG06718THMND
2014-01-31BG06718TTHMND
2014-02-12BG09383VOC11.30 ppb
2014-04-02BG26931VOC10.940 ppb
2014-04-03BG26932VOC1ND
2014-04-03BG26933VOC1ND
2014-04-22BG36625THMND
2014-04-22BG36625TTHMND
2014-04-22BG36626TTHMND
2014-04-22BG36627TTHMND
2014-04-22BG36628THMND
2014-04-22BG36628TTHMND
2014-07-09BG72399VOC10.550 ppb
2014-07-09BG72400VOC1ND
2014-07-09BG72401VOC1ND
2014-07-22BG81008TTHMND
2014-07-22BG81009TTHMND
2014-07-22BG81010TTHMND
2014-07-22BG81011TTHMND
2014-10-01BH22261VOC10.670 ppb
2014-10-16BH28261VOC1ND
2014-10-16BH28262VOC1ND
2014-10-22BH31458TTHMND
2014-10-22BH31459TTHMND
2014-10-22BH31460TTHMND
2014-10-22BH31461TTHMND
2015-01-07BH61112VOC1ND
2015-01-07BH61113VOC1ND
2015-01-07BH61114VOC1ND
2015-01-07BH61115VOC1ND
2015-01-07BH61116VOC1ND
2015-01-21BH66106TTHMND
2015-01-21BH66103TTHMND
2015-01-21BH66105TTHMND
2015-01-21BH66104TTHMND
2015-01-22BH66100VOC1ND
2015-04-27BJ08473TTHMND
2015-04-27BJ08472TTHMND
2015-04-28BJ08474TTHMND
2015-04-28BJ08471TTHMND
2015-04-28BJ08475VOC1ND
2015-04-28BJ08476VOC1ND
2015-05-05BJ12368VOC1ND
2015-07-15BJ47000VOC1ND
2015-07-15BJ47001VOC1ND
2015-07-20BJ60684TTHMND
2015-07-20BJ60682TTHMND
2015-07-20BJ60685TTHMND
2015-07-21BJ60686TTHM3.50 ppb
2015-08-05BJ69611VOC10.520 ppb
2015-10-05BK02871TTHMND
2015-10-05BK02873TTHM0.610 ppb
2015-10-06BK02872TTHMND
2015-10-06BK02876VOC11.30 ppb
2015-10-06BK02877VOC1ND
2015-10-06BK02878VOC1ND
2015-10-20BK11417TTHM1.30 ppb
2016-01-11BK51263TTHMND
2016-01-11BK51264TTHMND
2016-01-11BK51265TTHMND
2016-01-11BK51257VOC1ND
2016-01-11BK51258VOC1ND
2016-01-11BK51260VOC1ND
2016-01-11BK51261VOC1ND
2016-01-11BK51259VOC1ND
2016-01-18BK54312TTHM2.20 ppb
2016-04-11BN12525VOC1ND
2016-04-11BN12526VOC1ND
2016-04-11BN12527VOC1ND
2016-04-18BN15772TTHMND
2016-04-18BN15773TTHMND
2016-04-18BN15774TTHMND
2016-04-18BN15775TTHM1.50 ppb
2016-07-12BN71240TTHMND
2016-07-12BN71241TTHM1.10 ppb
2016-07-13BN72150TTHMND
2016-07-13BN72151TTHM1.90 ppb
2016-08-16BN92944VOC11.20 ppb
2016-08-16BN92945VOC1ND
2016-08-16BN92946VOC1ND
2016-10-04BV35900TTHM4.70 ppb
2016-10-04BV35901TTHM1.70 ppb
2016-10-04BV35905TTHM0.650 ppb
2016-10-11BV44240TTHM0.840 ppb
2016-10-24BV62669VOC1ND
2016-10-24BV62670VOC1ND
2016-11-01BV72457VOC1ND
2017-01-17BX30317TTHM0.800 ppb
2017-01-17BX30318TTHMND
2017-01-17BX30319TTHMND
2017-01-17BX30320TTHMND
2017-04-11BY02319TTHMND
2017-04-11BY02320TTHM1.50 ppb
2017-04-11BY02321TTHMND
2017-04-11BY02322TTHMND
2017-05-23BY28459VOC11.60 ppb
2017-07-18BY63323TTHMND
2017-07-18BY63324TTHM0.930 ppb
2017-07-18BY63325TTHMND
2017-07-18BY63326TTHMND
2017-07-25BY71391VOC11.50 ppb
2017-07-25BY71392VOC1ND
2017-07-25BY71394VOC1ND
2017-07-25BY71393VOC1ND
2017-08-15BY84216VOC1ND
2017-10-24BZ26033TTHM3.40 ppb
2017-10-24BZ26034TTHM3.60 ppb
2017-10-24BZ26035TTHM1.50 ppb
2017-10-24BZ26036TTHM4.20 ppb
2017-10-27BZ28354VOC11.90 ppb
2017-11-28BZ47211VOC10.530 ppb
2018-01-16BZ73286TTHMND
2018-01-16BZ73287TTHM0.670 ppb
2018-01-16BZ73288TTHMND
2018-01-16BZ73289TTHMND
2018-04-27CA37381TTHMND
2018-04-27CA37382TTHMND
2018-04-27CA37383TTHMND
2018-04-27CA37384TTHMND
2018-07-23CA967421.50 ppb
2018-07-23CA96743ND
2018-07-24CA967340.520 ppb
2018-07-24CA967351.50 ppb
2018-07-24CA96736ND
2018-07-24CA967373.20 ppb
2018-07-31CB01360ND
2018-10-02DBP 200507665ND
2018-10-02DBP 2005076661.10 ppb
2018-10-02DBP 200507667ND
2018-10-02DBP 200508020ND
2019-01-08DBP 200518130ND
2019-01-08DBP 2005181361.40 ppb
2019-01-08DBP 200518139ND
2019-01-08DBP 200518143ND
2019-01-29VOC1 200520002ND
2019-01-29VOC1 2005199970.900 ppb
2019-04-09DBP 2005278464.70 ppb
2019-04-09DBP 2005278473.90 ppb
2019-04-09DBP 2005278480.600 ppb
2019-04-09DBP 2005278494.60 ppb
2019-07-02DBP 200538986ND
2019-07-02DBP 200538987ND
2019-07-02DBP 200538988ND
2019-07-02DBP 200538989ND
2019-10-08DBP 2005520120.600 ppb
2019-10-08DBP 2005520130.700 ppb
2019-10-08DBP 2005520140.600 ppb
2019-10-08DBP 2005520150.700 ppb