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EWG's Tap Water Database — 2021 UPDATE

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Bromodichloromethane

CTWC - Shoreline Region-Guilford 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

 

163

Samples

0

Samples exceeding legal limit (MCL)

128

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20144.53 ppb2920ND - 11.0 ppb
20154.67 ppb2821ND - 10.00 ppb
20164.57 ppb2721ND - 11.0 ppb
20175.54 ppb2623ND - 12.0 ppb
20185.39 ppb2722ND - 15.3 ppb
20195.18 ppb2621ND - 10.5 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
2014-01-29140130CWCBVOC1ND
2014-02-242223VOC1ND
2014-03-052672VOC10.800 ppb
2014-03-213482THM3.40 ppb
2014-03-213483THM4.00 ppb
2014-03-213484THM5.20 ppb
2014-03-213485THM6.50 ppb
2014-04-215353VOC1ND
2014-04-215354VOC1ND
2014-06-128366VOC1ND
2014-06-128367VOC1ND
2014-06-128370VOC15.50 ppb
2014-06-188760THM11.0 ppb
2014-06-188761THM9.70 ppb
2014-06-188764THM10.1 ppb
2014-06-188765THM11.0 ppb
2014-08-13140915-0128VOC14.40 ppb
2014-08-13140915-0129VOC1ND
2014-08-13BG93593VOC14.40 ppb
2014-08-13BG93595VOC1ND
2014-09-15BH14101TTHM7.20 ppb
2014-09-15BH14102TTHM8.80 ppb
2014-09-15BH14103TTHM9.30 ppb
2014-09-15BH14104TTHM9.20 ppb
2014-11-03BH35439VOC1ND
2014-12-17BH54708TTHM4.00 ppb
2014-12-17BH54709TTHM5.60 ppb
2014-12-17BH54710TTHM5.80 ppb
2014-12-17BH54711TTHM5.50 ppb
2015-01-21BH65787VOC14.10 ppb
2015-02-12BH73177VOC13.00 ppb
2015-03-09BH80664VOC1ND
2015-03-11BH82212TTHM4.50 ppb
2015-03-11BH82210TTHM4.10 ppb
2015-03-11BH82211TTHM4.80 ppb
2015-03-11BH82209TTHM3.60 ppb
2015-06-02BJ24597VOC14.20 ppb
2015-06-02BJ24602VOC1ND
2015-06-02BJ24619VOC1ND
2015-06-02BJ24617VOC1ND
2015-06-03BJ25404VOC1ND
2015-06-16BJ31715TTHM7.80 ppb
2015-06-16BJ31717TTHM9.50 ppb
2015-06-16BJ31718TTHM10.00 ppb
2015-06-16BJ31716TTHM10.00 ppb
2015-07-27BJ63977VOC12.80 ppb
2015-07-27BJ63961VOC1ND
2015-09-15BJ92121TTHM8.70 ppb
2015-09-15BJ92120TTHM8.40 ppb
2015-09-15BJ92119TTHM6.30 ppb
2015-09-15BJ92122TTHM9.30 ppb
2015-10-19BK10284VOC1ND
2015-11-03BK17717VOC14.10 ppb
2015-12-08BK34312TTHM6.80 ppb
2015-12-08BK34309TTHM5.30 ppb
2015-12-08BK34310TTHM7.00 ppb
2015-12-08BK34311TTHM6.40 ppb
2016-01-11BK50864VOC1ND
2016-01-19BK54776VOC11.30 ppb
2016-01-19BK54777VOC1ND
2016-02-11BK64351VOC12.60 ppb
2016-03-14BK78125VOC14.20 ppb
2016-03-15BK78696TTHM5.30 ppb
2016-03-15BK78697TTHM5.10 ppb
2016-03-15BK78692TTHM4.90 ppb
2016-03-15BK78693TTHM3.70 ppb
2016-04-11BN11374VOC14.70 ppb
2016-04-11BN11376VOC1ND
2016-06-01BN44892VOC1ND
2016-06-01BN44876VOC1ND
2016-06-14BN54616TTHM7.70 ppb
2016-06-14BN54617TTHM6.70 ppb
2016-06-14BN54618TTHM8.50 ppb
2016-06-14BN54619TTHM8.30 ppb
2016-07-12BN71476VOC1ND
2016-07-13BN72282VOC14.70 ppb
2016-09-14BV14928TTHM10.00 ppb
2016-09-14BV14929TTHM9.90 ppb
2016-09-14BV14930TTHM6.50 ppb
2016-09-14BV14931TTHM11.0 ppb
2016-12-15BX06134TTHM6.20 ppb
2016-12-15BX06135TTHM6.10 ppb
2016-12-15BX06136TTHM1.40 ppb
2016-12-15BX06137TTHM4.60 ppb
2017-01-17BX30298VOC14.00 ppb
2017-01-17BX30299VOC1ND
2017-01-18BX31348VOC12.90 ppb
2017-01-30BX40966VOC1ND
2017-03-08BX82062VOC10.530 ppb
2017-03-17BX89076TTHM3.70 ppb
2017-03-17BX89077TTHM3.50 ppb
2017-03-17BX89078TTHM3.10 ppb
2017-03-17BX89073TTHM2.60 ppb
2017-06-19BY42240TTHM8.60 ppb
2017-06-19BY42241TTHM12.0 ppb
2017-06-19BY42242TTHM11.0 ppb
2017-06-19BY42243TTHM9.90 ppb
2017-06-29BY50637VOC15.10 ppb
2017-09-14BZ02387TTHM7.80 ppb
2017-09-14BZ02388TTHM11.0 ppb
2017-09-14BZ02389TTHM11.0 ppb
2017-09-14BZ02390TTHM9.20 ppb
2017-09-25BZ09163VOC14.50 ppb
2017-10-24BZ27135VOC10.510 ppb
2017-10-25BZ27134VOC1ND
2017-11-09BZ38785VOC15.40 ppb
2017-12-14BZ60231TTHM8.10 ppb
2017-12-14BZ60232TTHM7.60 ppb
2017-12-14BZ60233TTHM5.20 ppb
2017-12-14BZ60234TTHM6.80 ppb
2018-01-16BZ73485VOC13.80 ppb
2018-03-15CA03073TTHM3.70 ppb
2018-03-15CA03074TTHM2.90 ppb
2018-03-15CA03075TTHM4.00 ppb
2018-03-15CA03076TTHM4.10 ppb
2018-03-30CA11464VOC13.40 ppb
2018-04-11CA18261VOC13.90 ppb
2018-06-26CA80045TTHM11.0 ppb
2018-06-26CA80046TTHM10.00 ppb
2018-06-26CA80047TTHM8.70 ppb
2018-06-26CA80048TTHM6.90 ppb
2018-07-09CA85598VOC1ND
2018-07-17CA919794.40 ppb
2018-09-12DBP 2005050429.50 ppb
2018-09-12DBP 20050504315.0 ppb
2018-09-12DBP 20050504413.5 ppb
2018-09-12DBP 20050504715.3 ppb
2018-09-13VOC1 200505275ND
2018-09-13VOC1 200505276ND
2018-09-13VOC1 200505266ND
2018-09-19VOC1 2005061161.60 ppb
2018-09-20VOC1 200506324ND
2018-10-25VOC1 2005105685.20 ppb
2018-12-17DBP 2005162354.30 ppb
2018-12-17DBP 2005162373.30 ppb
2018-12-17DBP 2005162385.20 ppb
2018-12-17DBP 2005162395.70 ppb
2019-01-30VOC1 2005200572.50 ppb
2019-03-11DBP 2005241503.20 ppb
2019-03-11DBP 2005241514.30 ppb
2019-03-11DBP 2005241525.20 ppb
2019-03-11DBP 2005241545.50 ppb
2019-06-14DBP 2005366726.00 ppb
2019-06-14DBP 2005366747.60 ppb
2019-06-14DBP 2005366808.50 ppb
2019-06-14DBP 2005366828.00 ppb
2019-06-24VOC1 2005380054.20 ppb
2019-07-08VOC1 2005411723.80 ppb
2019-07-08VOC1 200539194ND
2019-07-16VOC1 200541091ND
2019-07-16VOC1 2005406481.50 ppb
2019-07-16VOC1 200540644ND
2019-09-17DBP 2005494788.40 ppb
2019-09-17DBP 2005494799.90 ppb
2019-09-17DBP 20054948010.5 ppb
2019-09-17DBP 20054948110.3 ppb
2019-09-17VOC1 200549238ND
2019-09-18VOC1 200549465ND
2019-12-10DBP 2005596425.10 ppb
2019-12-10DBP 2005596437.00 ppb
2019-12-10DBP 2005596447.80 ppb
2019-12-10DBP 2005596459.10 ppb
2019-12-10VOC1 2005596636.30 ppb