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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

CTWC - Unionville 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

 

165

Samples

0

Samples exceeding legal limit (MCL)

118

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.58 ppb4329ND - 5.70 ppb
20152.33 ppb3117ND - 5.50 ppb
20162.43 ppb3017ND - 7.60 ppb
20172.74 ppb2420ND - 5.60 ppb
20184.11 ppb1918ND - 8.00 ppb
20195.57 ppb1817ND - 11.1 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
2014-01-21BG01724VOC1ND
2014-01-22BG01725VOC1ND
2014-01-22BG01726VOC1ND
2014-01-22BG017276VOC1ND
2014-01-22BG01727VOC1ND
2014-01-22BG01728VOC1ND
2014-01-22BG02299TTHM3.70 ppb
2014-01-23BG02294TTHM1.60 ppb
2014-01-23BG02295TTHM3.60 ppb
2014-01-23BG02296TTHM1.80 ppb
2014-01-23BG02297TTHM5.70 ppb
2014-01-23BG02298TTHM2.00 ppb
2014-01-23BG02300TTHM2.90 ppb
2014-01-31BG02295THM3.60 ppb
2014-01-31BG06715TTHM4.30 ppb
2014-01-31BG06716TTHM4.60 ppb
2014-01-31BG06717TTHM4.70 ppb
2014-01-31BG06718THM4.30 ppb
2014-01-31BG06718TTHM4.30 ppb
2014-02-12BG09383VOC12.00 ppb
2014-04-02BG26931VOC10.880 ppb
2014-04-03BG26932VOC1ND
2014-04-03BG26933VOC1ND
2014-04-22BG36625THM3.60 ppb
2014-04-22BG36625TTHM3.60 ppb
2014-04-22BG36626TTHM3.50 ppb
2014-04-22BG36627TTHM3.70 ppb
2014-04-22BG36628THM4.80 ppb
2014-04-22BG36628TTHM4.80 ppb
2014-07-09BG72399VOC1ND
2014-07-09BG72400VOC1ND
2014-07-09BG72401VOC1ND
2014-07-22BG81008TTHM4.50 ppb
2014-07-22BG81009TTHM4.00 ppb
2014-07-22BG81010TTHM4.90 ppb
2014-07-22BG81011TTHM5.40 ppb
2014-10-01BH22261VOC1ND
2014-10-16BH28261VOC1ND
2014-10-16BH28262VOC1ND
2014-10-22BH31458TTHM4.10 ppb
2014-10-22BH31459TTHM4.50 ppb
2014-10-22BH31460TTHM4.30 ppb
2014-10-22BH31461TTHM5.20 ppb
2015-01-07BH61112VOC1ND
2015-01-07BH61113VOC1ND
2015-01-07BH61114VOC1ND
2015-01-07BH61115VOC1ND
2015-01-07BH61116VOC1ND
2015-01-21BH66105TTHM3.60 ppb
2015-01-21BH66106TTHM4.60 ppb
2015-01-21BH66103TTHM3.30 ppb
2015-01-21BH66104TTHM4.20 ppb
2015-01-22BH66100VOC1ND
2015-04-27BJ08473TTHM3.90 ppb
2015-04-27BJ08472TTHM4.10 ppb
2015-04-28BJ08471TTHM3.80 ppb
2015-04-28BJ08474TTHM4.70 ppb
2015-04-28BJ08475VOC1ND
2015-04-28BJ08476VOC1ND
2015-05-05BJ12368VOC1ND
2015-07-15BJ47000VOC1ND
2015-07-15BJ47001VOC1ND
2015-07-20BJ60684TTHM5.40 ppb
2015-07-20BJ60682TTHM4.00 ppb
2015-07-20BJ60685TTHM4.20 ppb
2015-07-21BJ60686TTHM4.70 ppb
2015-08-05BJ69611VOC1ND
2015-10-05BK02871TTHM5.10 ppb
2015-10-05BK02873TTHM5.50 ppb
2015-10-06BK02872TTHM4.50 ppb
2015-10-06BK02876VOC11.80 ppb
2015-10-06BK02877VOC1ND
2015-10-06BK02878VOC1ND
2015-10-20BK11417TTHM4.90 ppb
2016-01-11BK51263TTHM3.20 ppb
2016-01-11BK51264TTHM3.40 ppb
2016-01-11BK51265TTHM4.40 ppb
2016-01-11BK51257VOC1ND
2016-01-11BK51258VOC1ND
2016-01-11BK51260VOC1ND
2016-01-11BK51261VOC1ND
2016-01-11BK51259VOC1ND
2016-01-18BK54312TTHM4.00 ppb
2016-04-11BN12525VOC1ND
2016-04-11BN12526VOC1ND
2016-04-11BN12527VOC1ND
2016-04-18BN15772TTHM4.20 ppb
2016-04-18BN15773TTHM4.50 ppb
2016-04-18BN15774TTHM3.00 ppb
2016-04-18BN15775TTHM4.40 ppb
2016-07-12BN71240TTHM3.70 ppb
2016-07-12BN71241TTHM1.20 ppb
2016-07-13BN72150TTHM5.00 ppb
2016-07-13BN72151TTHM5.80 ppb
2016-08-16BN92944VOC11.40 ppb
2016-08-16BN92945VOC1ND
2016-08-16BN92946VOC1ND
2016-10-04BV35900TTHM7.60 ppb
2016-10-04BV35901TTHM5.50 ppb
2016-10-04BV35905TTHM5.50 ppb
2016-10-11BV44240TTHM6.10 ppb
2016-10-24BV62669VOC1ND
2016-10-24BV62670VOC1ND
2016-11-01BV72457VOC1ND
2017-01-17BX30317TTHM4.00 ppb
2017-01-17BX30318TTHM2.50 ppb
2017-01-17BX30319TTHM2.70 ppb
2017-01-17BX30320TTHM3.40 ppb
2017-04-11BY02319TTHM3.50 ppb
2017-04-11BY02320TTHM5.60 ppb
2017-04-11BY02321TTHM3.40 ppb
2017-04-11BY02322TTHM4.10 ppb
2017-05-23BY28459VOC12.20 ppb
2017-07-18BY63323TTHM3.20 ppb
2017-07-18BY63324TTHM0.560 ppb
2017-07-18BY63325TTHM4.00 ppb
2017-07-18BY63326TTHM4.10 ppb
2017-07-25BY71391VOC11.60 ppb
2017-07-25BY71392VOC1ND
2017-07-25BY71394VOC1ND
2017-07-25BY71393VOC10.810 ppb
2017-08-15BY84216VOC1ND
2017-10-24BZ26033TTHM3.40 ppb
2017-10-24BZ26034TTHM4.80 ppb
2017-10-24BZ26035TTHM4.80 ppb
2017-10-24BZ26036TTHM4.60 ppb
2017-10-27BZ28354VOC12.40 ppb
2017-11-28BZ47211VOC1ND
2018-01-16BZ73286TTHM3.60 ppb
2018-01-16BZ73287TTHM4.00 ppb
2018-01-16BZ73288TTHM3.50 ppb
2018-01-16BZ73289TTHM3.90 ppb
2018-04-27CA37381TTHM3.30 ppb
2018-04-27CA37382TTHM3.90 ppb
2018-04-27CA37383TTHM3.60 ppb
2018-04-27CA37384TTHM4.00 ppb
2018-07-23CA967421.50 ppb
2018-07-23CA96743ND
2018-07-24CA967344.30 ppb
2018-07-24CA967355.40 ppb
2018-07-24CA967364.40 ppb
2018-07-24CA967378.00 ppb
2018-07-31CB013601.50 ppb
2018-10-02DBP 2005076654.90 ppb
2018-10-02DBP 2005076667.00 ppb
2018-10-02DBP 2005076676.00 ppb
2018-10-02DBP 2005080205.30 ppb
2019-01-08DBP 2005181305.20 ppb
2019-01-08DBP 2005181364.50 ppb
2019-01-08DBP 2005181394.40 ppb
2019-01-08DBP 2005181435.00 ppb
2019-01-29VOC1 200520002ND
2019-01-29VOC1 2005199971.10 ppb
2019-04-09DBP 20052784611.1 ppb
2019-04-09DBP 2005278477.60 ppb
2019-04-09DBP 2005278485.50 ppb
2019-04-09DBP 2005278499.70 ppb
2019-07-02DBP 2005389864.50 ppb
2019-07-02DBP 2005389875.10 ppb
2019-07-02DBP 2005389884.50 ppb
2019-07-02DBP 2005389894.80 ppb
2019-10-08DBP 2005520126.40 ppb
2019-10-08DBP 2005520137.50 ppb
2019-10-08DBP 2005520146.50 ppb
2019-10-08DBP 2005520156.80 ppb