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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

Connecticut Water Company - Northern Region-Western 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

 

230

Samples

0

Samples exceeding legal limit (MCL)

205

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20146.64 ppb4434ND - 14.0 ppb
20157.37 ppb3934ND - 14.0 ppb
20167.16 ppb3733ND - 13.0 ppb
20178.70 ppb3834ND - 16.0 ppb
201811.0 ppb3836ND - 17.4 ppb
20199.94 ppb34340.600 ppb - 15.6 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
2014-01-24BG03077VOC1ND
2014-01-29BG04659VOC10.570 ppb
2014-02-041747THM10.00 ppb
2014-02-041748THM5.30 ppb
2014-02-041749THM9.90 ppb
2014-02-041750THM6.00 ppb
2014-02-041751THM6.20 ppb
2014-02-041752THM5.00 ppb
2014-02-041753THM9.30 ppb
2014-02-041754THM11.9 ppb
2014-02-07BG08003VOC1ND
2014-04-03BG27981VOC1ND
2014-04-094561VOC15.70 ppb
2014-05-066108THM10.1 ppb
2014-05-066109THM13.6 ppb
2014-05-066110THM7.40 ppb
2014-05-066111THM13.5 ppb
2014-05-066112THM5.40 ppb
2014-05-066113THM11.7 ppb
2014-05-066114THM7.00 ppb
2014-05-096107THM8.50 ppb
2014-05-21BG47680VOC1ND
2014-06-04BG53346VOC1ND
2014-06-06BG54002VOC1ND
2014-06-17BG60666VOC1ND
2014-06-19BG62968VOC1ND
2014-07-11BG73249VOC1ND
2014-08-05BG88648TTHM8.30 ppb
2014-08-05BG88649TTHM13.0 ppb
2014-08-05BG88650TTHM12.0 ppb
2014-08-05BG88651TTHM8.80 ppb
2014-08-05BG88652TTHM14.0 ppb
2014-08-05BG88653TTHM4.60 ppb
2014-08-05BG88654TTHM11.0 ppb
2014-08-05BG88655TTHM8.80 ppb
2014-11-21BH44966VOC1ND
2014-11-25BH46470TTHM6.80 ppb
2014-11-25BH46471TTHM11.0 ppb
2014-11-25BH46472TTHM10.00 ppb
2014-11-25BH46473TTHM9.60 ppb
2014-11-25BH46474TTHM11.0 ppb
2014-11-25BH46475TTHM5.00 ppb
2014-11-25BH46476TTHM5.60 ppb
2014-11-25BH46477TTHM5.80 ppb
2015-01-20BH64902VOC14.70 ppb
2015-02-25BH77220TTHM12.0 ppb
2015-02-25BH77225TTHM7.80 ppb
2015-02-25BH77222TTHM7.90 ppb
2015-02-25BH77226TTHM6.30 ppb
2015-02-25BH77221TTHM11.0 ppb
2015-02-25BH77223TTHM13.0 ppb
2015-02-25BH77224TTHM4.90 ppb
2015-02-25BH77219TTHM6.70 ppb
2015-03-06BH80296VOC1ND
2015-04-29BJ09906VOC1ND
2015-04-30BJ10443VOC1ND
2015-05-21BJ20488TTHM5.30 ppb
2015-05-21BJ20482TTHM6.20 ppb
2015-05-21BJ20485TTHM9.10 ppb
2015-05-21BJ20483TTHM6.20 ppb
2015-05-21BJ20487TTHM4.70 ppb
2015-05-21BJ20484TTHM8.50 ppb
2015-05-21BJ20486TTHM4.80 ppb
2015-05-21BJ20481TTHM6.40 ppb
2015-07-01BJ40227VOC1ND
2015-07-02BJ41078VOC1ND
2015-07-30BJ65812VOC10.760 ppb
2015-08-20BJ78788TTHM8.70 ppb
2015-08-20BJ78784TTHM14.0 ppb
2015-08-20BJ78787TTHM8.80 ppb
2015-08-20BJ78782TTHM14.0 ppb
2015-08-20BJ78785TTHM14.0 ppb
2015-08-20BJ78783TTHM14.0 ppb
2015-08-20BJ78781TTHM8.40 ppb
2015-08-20BJ78786TTHM5.10 ppb
2015-11-24BK27973TTHM6.20 ppb
2015-11-24BK27969TTHM9.80 ppb
2015-11-24BK27972TTHM5.20 ppb
2015-11-24BK27968TTHM14.0 ppb
2015-11-24BK27970TTHM13.0 ppb
2015-11-24BK27967TTHM13.0 ppb
2015-11-24BK27971TTHM5.00 ppb
2015-11-24BK27966TTHM8.00 ppb
2016-01-12BK51386VOC13.50 ppb
2016-01-15BK53768VOC1ND
2016-02-04BK61857TTHM6.50 ppb
2016-02-04BK61858TTHM11.0 ppb
2016-02-04BK61859TTHM10.00 ppb
2016-02-04BK61860TTHM9.40 ppb
2016-02-04BK61861TTHM11.0 ppb
2016-02-04BK61862TTHM4.60 ppb
2016-02-04BK61863TTHM5.30 ppb
2016-02-04BK61864TTHM5.70 ppb
2016-05-05BN26300TTHM6.40 ppb
2016-05-05BN26301TTHM12.0 ppb
2016-05-05BN26302TTHM9.90 ppb
2016-05-05BN26303TTHM9.20 ppb
2016-05-05BN26304TTHM12.0 ppb
2016-05-05BN26305TTHM3.80 ppb
2016-05-05BN26306TTHM5.00 ppb
2016-05-05BN26307TTHM5.80 ppb
2016-05-25BN40000VOC1ND
2016-06-09BN51878VOC1ND
2016-07-15BN73865VOC1ND
2016-08-18BN94948TTHM8.20 ppb
2016-08-18BN94949TTHM13.0 ppb
2016-08-18BN94950TTHM5.10 ppb
2016-08-18BN94951TTHM9.30 ppb
2016-08-18BN94952TTHM13.0 ppb
2016-08-18BN94953TTHM3.80 ppb
2016-08-18BN94954TTHM10.00 ppb
2016-08-18BN94955TTHM8.30 ppb
2016-11-03BV75338TTHM6.70 ppb
2016-11-03BV75339TTHM13.0 ppb
2016-11-03BV75340TTHM8.20 ppb
2016-11-03BV75341TTHM6.50 ppb
2016-11-03BV75342TTHM13.0 ppb
2016-11-03BV75343TTHM5.10 ppb
2016-11-03BV75344TTHM5.10 ppb
2016-11-03BV75345TTHM5.40 ppb
2017-02-02BX44867TTHM5.50 ppb
2017-02-02BX44868TTHM12.0 ppb
2017-02-02BX44869TTHM9.20 ppb
2017-02-02BX44870TTHM7.30 ppb
2017-02-02BX44871TTHM12.0 ppb
2017-02-02BX44872TTHM3.80 ppb
2017-02-02BX44873TTHM5.00 ppb
2017-02-02BX44874TTHM5.50 ppb
2017-02-08BX57435VOC13.90 ppb
2017-03-03BX79851VOC10.550 ppb
2017-03-03BX79849VOC1ND
2017-04-21BY07962VOC1ND
2017-05-04BY15439TTHM5.50 ppb
2017-05-04BY15440TTHM12.0 ppb
2017-05-04BY15441TTHM5.70 ppb
2017-05-04BY15442TTHM7.40 ppb
2017-05-04BY15443TTHM12.0 ppb
2017-05-04BY15444TTHM4.10 ppb
2017-05-04BY15445TTHM7.00 ppb
2017-05-04BY15446TTHM7.10 ppb
2017-06-01BY32099VOC1ND
2017-07-07BY54441VOC1ND
2017-08-07BY79801TTHM14.0 ppb
2017-08-07BY79802TTHM15.0 ppb
2017-08-07BY79803TTHM13.0 ppb
2017-08-07BY79804TTHM12.0 ppb
2017-08-07BY79805TTHM14.0 ppb
2017-08-07BY79806TTHM12.0 ppb
2017-08-07BY79807TTHM12.0 ppb
2017-08-07BY79808TTHM11.0 ppb
2017-11-06BZ33918TTHM13.0 ppb
2017-11-16BZ43465TTHM13.0 ppb
2017-11-16BZ43466TTHM15.0 ppb
2017-11-16BZ43467TTHM16.0 ppb
2017-11-16BZ43468TTHM15.0 ppb
2017-11-16BZ43469TTHM10.00 ppb
2017-11-16BZ43470TTHM11.0 ppb
2017-11-16BZ43471TTHM9.10 ppb
2018-01-23BZ78888VOC15.70 ppb
2018-01-31BZ82950VOC1ND
2018-02-01BZ83504TTHM9.80 ppb
2018-02-01BZ83505TTHM12.0 ppb
2018-02-01BZ83506TTHM12.0 ppb
2018-02-01BZ83507TTHM13.0 ppb
2018-02-01BZ83508TTHM6.70 ppb
2018-02-01BZ83509TTHM7.10 ppb
2018-02-01BZ83510TTHM6.50 ppb
2018-02-21BZ93283TTHM8.70 ppb
2018-05-03CA41161TTHM10.00 ppb
2018-05-03CA41162TTHM13.0 ppb
2018-05-03CA41163TTHM13.0 ppb
2018-05-03CA41164TTHM14.0 ppb
2018-05-03CA41165TTHM6.10 ppb
2018-05-03CA41166TTHM7.40 ppb
2018-05-03CA41167TTHM7.70 ppb
2018-05-03D8E0468-01VOC14.1 ppb
2018-05-15CA48118TTHM10.00 ppb
2018-07-13CA89901ND
2018-08-02CB0402011.0 ppb
2018-08-02CB0402117.0 ppb
2018-08-02CB0402215.0 ppb
2018-08-02CB0402315.0 ppb
2018-08-02CB040248.90 ppb
2018-08-02CB0402513.0 ppb
2018-08-02CB0402613.0 ppb
2018-08-06CB0584015.0 ppb
2018-08-10DBP 20050203115.0 ppb
2018-08-10CB0915417.0 ppb
2018-11-01DBP 20051113314.3 ppb
2018-11-01DBP 20051113416.1 ppb
2018-11-01DBP 20051113516.8 ppb
2018-11-01DBP 20051113617.4 ppb
2018-11-01DBP 20051113710.4 ppb
2018-11-01DBP 2005111387.40 ppb
2018-11-01DBP 2005111399.00 ppb
2018-11-05DBP 20051138910.2 ppb
2019-01-02VOC1 2005173095.40 ppb
2019-02-07DBP 2005210835.80 ppb
2019-02-07DBP 20052108411.5 ppb
2019-02-07DBP 2005210856.20 ppb
2019-02-07DBP 20052108611.4 ppb
2019-02-07DBP 2005210876.10 ppb
2019-02-07DBP 20052108812.5 ppb
2019-02-07DBP 20052108910.3 ppb
2019-02-11DBP 2005212567.60 ppb
2019-03-15VOC1 2005248830.600 ppb
2019-05-09DBP 2005315758.50 ppb
2019-05-09DBP 20053157611.0 ppb
2019-05-09DBP 20053157710.8 ppb
2019-05-09DBP 20053158211.3 ppb
2019-05-09DBP 2005315845.60 ppb
2019-05-09DBP 2005315865.20 ppb
2019-05-09DBP 2005315875.10 ppb
2019-05-13DBP 2005318377.90 ppb
2019-08-01DBP 20054272210.4 ppb
2019-08-01DBP 20054272313.1 ppb
2019-08-01DBP 20054272411.0 ppb
2019-08-01DBP 20054272514.8 ppb
2019-08-01DBP 20054272611.5 ppb
2019-08-01DBP 2005427279.10 ppb
2019-08-01DBP 2005427288.60 ppb
2019-08-13DBP 20054475811.8 ppb
2019-11-07DBP 20055582815.4 ppb
2019-11-07DBP 20055583015.4 ppb
2019-11-07DBP 20055583115.6 ppb
2019-11-07DBP 20055583215.5 ppb
2019-11-07DBP 20055583312.3 ppb
2019-11-07DBP 20055583410.5 ppb
2019-11-07DBP 2005558358.90 ppb
2019-11-18DBP 20055700411.3 ppb