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EWG's Tap Water Database — 2021 UPDATE

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Dibromochloromethane

CTWC - Shoreline Region-Guilford 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

 

163

Samples

0

Samples exceeding legal limit (MCL)

123

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.808 ppb2919ND - 2.30 ppb
20150.954 ppb2821ND - 2.00 ppb
20161.22 ppb2720ND - 2.90 ppb
20171.16 ppb2621ND - 2.50 ppb
20181.36 ppb2721ND - 3.20 ppb
20191.54 ppb2621ND - 3.60 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
2014-01-29140130CWCBVOC1ND
2014-02-242223VOC1ND
2014-03-052672VOC10.800 ppb
2014-03-213482THM0.500 ppb
2014-03-213483THM0.800 ppb
2014-03-213484THM0.900 ppb
2014-03-213485THM1.10 ppb
2014-04-215353VOC1ND
2014-04-215354VOC1ND
2014-06-128366VOC1ND
2014-06-128367VOC1ND
2014-06-128370VOC11.10 ppb
2014-06-188760THM1.90 ppb
2014-06-188761THM1.30 ppb
2014-06-188764THM1.60 ppb
2014-06-188765THM1.90 ppb
2014-08-13140915-0128VOC1ND
2014-08-13140915-0129VOC1ND
2014-08-13BG93593VOC11.10 ppb
2014-08-13BG93595VOC1ND
2014-09-15BH14101TTHM1.50 ppb
2014-09-15BH14102TTHM1.90 ppb
2014-09-15BH14103TTHM2.20 ppb
2014-09-15BH14104TTHM2.30 ppb
2014-11-03BH35439VOC1ND
2014-12-17BH54708TTHM0.500 ppb
2014-12-17BH54709TTHM0.660 ppb
2014-12-17BH54710TTHM0.720 ppb
2014-12-17BH54711TTHM0.640 ppb
2015-01-21BH65787VOC12.00 ppb
2015-02-12BH73177VOC10.880 ppb
2015-03-09BH80664VOC1ND
2015-03-11BH82211TTHM0.990 ppb
2015-03-11BH82209TTHM0.770 ppb
2015-03-11BH82210TTHM0.870 ppb
2015-03-11BH82212TTHM0.940 ppb
2015-06-02BJ24597VOC11.10 ppb
2015-06-02BJ24602VOC1ND
2015-06-02BJ24619VOC1ND
2015-06-02BJ24617VOC1ND
2015-06-03BJ25404VOC1ND
2015-06-16BJ31718TTHM1.70 ppb
2015-06-16BJ31715TTHM1.40 ppb
2015-06-16BJ31716TTHM1.80 ppb
2015-06-16BJ31717TTHM1.70 ppb
2015-07-27BJ63977VOC10.680 ppb
2015-07-27BJ63961VOC1ND
2015-09-15BJ92122TTHM1.80 ppb
2015-09-15BJ92119TTHM1.20 ppb
2015-09-15BJ92120TTHM1.50 ppb
2015-09-15BJ92121TTHM1.50 ppb
2015-10-19BK10284VOC1ND
2015-11-03BK17717VOC10.970 ppb
2015-12-08BK34312TTHM1.40 ppb
2015-12-08BK34309TTHM1.000 ppb
2015-12-08BK34311TTHM1.20 ppb
2015-12-08BK34310TTHM1.30 ppb
2016-01-11BK50864VOC1ND
2016-01-19BK54776VOC11.000 ppb
2016-01-19BK54777VOC1ND
2016-02-11BK64351VOC10.530 ppb
2016-03-14BK78125VOC10.910 ppb
2016-03-15BK78696TTHM0.930 ppb
2016-03-15BK78697TTHM1.000 ppb
2016-03-15BK78692TTHM0.990 ppb
2016-03-15BK78693TTHM0.680 ppb
2016-04-11BN11374VOC11.10 ppb
2016-04-11BN11376VOC1ND
2016-06-01BN44892VOC1ND
2016-06-01BN44876VOC1ND
2016-06-14BN54616TTHM2.60 ppb
2016-06-14BN54617TTHM2.30 ppb
2016-06-14BN54618TTHM2.80 ppb
2016-06-14BN54619TTHM2.80 ppb
2016-07-12BN71476VOC1ND
2016-07-13BN72282VOC11.20 ppb
2016-09-14BV14928TTHM2.80 ppb
2016-09-14BV14929TTHM2.80 ppb
2016-09-14BV14930TTHM1.80 ppb
2016-09-14BV14931TTHM2.90 ppb
2016-12-15BX06134TTHM1.40 ppb
2016-12-15BX06135TTHM1.40 ppb
2016-12-15BX06136TTHMND
2016-12-15BX06137TTHM0.890 ppb
2017-01-17BX30298VOC11.10 ppb
2017-01-17BX30299VOC1ND
2017-01-18BX31348VOC1ND
2017-01-30BX40966VOC1ND
2017-03-08BX82062VOC10.610 ppb
2017-03-17BX89076TTHM0.650 ppb
2017-03-17BX89077TTHM0.580 ppb
2017-03-17BX89078TTHM0.550 ppb
2017-03-17BX89073TTHMND
2017-06-19BY42240TTHM1.90 ppb
2017-06-19BY42241TTHM2.30 ppb
2017-06-19BY42242TTHM2.30 ppb
2017-06-19BY42243TTHM2.00 ppb
2017-06-29BY50637VOC11.20 ppb
2017-09-14BZ02387TTHM1.60 ppb
2017-09-14BZ02388TTHM2.50 ppb
2017-09-14BZ02389TTHM2.30 ppb
2017-09-14BZ02390TTHM1.90 ppb
2017-09-25BZ09163VOC11.30 ppb
2017-10-24BZ27135VOC11.000 ppb
2017-10-25BZ27134VOC1ND
2017-11-09BZ38785VOC11.50 ppb
2017-12-14BZ60231TTHM1.30 ppb
2017-12-14BZ60232TTHM1.40 ppb
2017-12-14BZ60233TTHM1.000 ppb
2017-12-14BZ60234TTHM1.20 ppb
2018-01-16BZ73485VOC10.990 ppb
2018-03-15CA03073TTHM0.560 ppb
2018-03-15CA03074TTHMND
2018-03-15CA03075TTHM0.610 ppb
2018-03-15CA03076TTHM0.620 ppb
2018-03-30CA11464VOC10.740 ppb
2018-04-11CA18261VOC11.000 ppb
2018-06-26CA80045TTHM2.60 ppb
2018-06-26CA80046TTHM2.50 ppb
2018-06-26CA80047TTHM2.00 ppb
2018-06-26CA80048TTHM1.60 ppb
2018-07-09CA85598VOC1ND
2018-07-17CA919791.10 ppb
2018-09-12DBP 2005050422.40 ppb
2018-09-12DBP 2005050433.20 ppb
2018-09-12DBP 2005050442.80 ppb
2018-09-12DBP 2005050473.20 ppb
2018-09-13VOC1 200505275ND
2018-09-13VOC1 200505276ND
2018-09-13VOC1 200505266ND
2018-09-19VOC1 2005061161.30 ppb
2018-09-20VOC1 200506324ND
2018-10-25VOC1 2005105681.000 ppb
2018-12-17DBP 2005162352.00 ppb
2018-12-17DBP 2005162371.90 ppb
2018-12-17DBP 2005162382.20 ppb
2018-12-17DBP 2005162392.50 ppb
2019-01-30VOC1 2005200570.900 ppb
2019-03-11DBP 2005241501.000 ppb
2019-03-11DBP 2005241511.20 ppb
2019-03-11DBP 2005241521.40 ppb
2019-03-11DBP 2005241541.50 ppb
2019-06-14DBP 2005366722.20 ppb
2019-06-14DBP 2005366742.50 ppb
2019-06-14DBP 2005366802.60 ppb
2019-06-14DBP 2005366823.00 ppb
2019-06-24VOC1 2005380051.10 ppb
2019-07-08VOC1 2005411720.900 ppb
2019-07-08VOC1 200539194ND
2019-07-16VOC1 200541091ND
2019-07-16VOC1 2005406481.000 ppb
2019-07-16VOC1 200540644ND
2019-09-17DBP 2005494782.90 ppb
2019-09-17DBP 2005494793.20 ppb
2019-09-17DBP 2005494803.40 ppb
2019-09-17DBP 2005494813.60 ppb
2019-09-17VOC1 200549238ND
2019-09-18VOC1 200549465ND
2019-12-10DBP 2005596421.30 ppb
2019-12-10DBP 2005596431.50 ppb
2019-12-10DBP 2005596441.70 ppb
2019-12-10DBP 2005596451.80 ppb
2019-12-10VOC1 2005596631.30 ppb