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EWG's Tap Water Database — 2021 UPDATE

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Chloromethane

CTWC - Shoreline Region-Guilford System

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

MORE ABOUT THIS CONTAMINANT

 

87

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.245 ppb333ND - 7.00 ppb
20150.138 ppb123ND - 0.600 ppb
20160.113 ppb112ND - 0.700 ppb
2017ND100ND
2018ND110ND
2019ND100ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-29140130CWCBVOC1ND
2014-02-10201402110107AMND
2014-02-10201402110109AMND
2014-02-10201402110093AMND
2014-02-11201402120674AMND
2014-02-11201402120438AMND
2014-02-11201402120405AMND
2014-02-11201402120403AMND
2014-02-11201402120573AMND
2014-02-242223VOC1ND
2014-03-052672VOC1ND
2014-04-08201404090427AMND
2014-04-08201404090510AMND
2014-04-215354VOC1ND
2014-04-215353VOC1ND
2014-05-21201405220417AMND
2014-06-128370VOC1ND
2014-06-128367VOC1ND
2014-06-128366VOC1ND
2014-08-04201408050418AMND
2014-08-04201408050337AMND
2014-08-04201408050384AMND
2014-08-04201408050412AM0.380 ppb
2014-08-13140915-0128VOC17.00 ppb
2014-08-13140915-0129VOC1ND
2014-08-13BG93593VOC10.700 ppb
2014-08-13BG93595VOC1ND
2014-08-25201408260368AMND
2014-08-26201408270820AMND
2014-08-26201408270840AMND
2014-08-26201408270836AMND
2014-11-03BH35439VOC1ND
2014-11-18201411190581AMND
2015-01-21BH65787VOC1ND
2015-02-12BH73177VOC1ND
2015-03-09BH80664VOC1ND
2015-06-02BJ24602VOC1ND
2015-06-02BJ24619VOC1ND
2015-06-02BJ24597VOC10.550 ppb
2015-06-02BJ24617VOC1ND
2015-06-03BJ25404VOC1ND
2015-07-27BJ63977VOC10.500 ppb
2015-07-27BJ63961VOC1ND
2015-10-19BK10284VOC1ND
2015-11-03BK17717VOC10.600 ppb
2016-01-11BK50864VOC1ND
2016-01-19BK54776VOC1ND
2016-01-19BK54777VOC1ND
2016-02-11BK64351VOC1ND
2016-03-14BK78125VOC1ND
2016-04-11BN11374VOC10.700 ppb
2016-04-11BN11376VOC10.540 ppb
2016-06-01BN44892VOC1ND
2016-06-01BN44876VOC1ND
2016-07-12BN71476VOC1ND
2016-07-13BN72282VOC1ND
2017-01-17BX30298VOC1ND
2017-01-17BX30299VOC1ND
2017-01-18BX31348VOC1ND
2017-01-30BX40966VOC1ND
2017-03-08BX82062VOC1ND
2017-06-29BY50637VOC1ND
2017-09-25BZ09163VOC1ND
2017-10-24BZ27135VOC1ND
2017-10-25BZ27134VOC1ND
2017-11-09BZ38785VOC1ND
2018-01-16BZ73485VOC1ND
2018-03-30CA11464VOC1ND
2018-04-11CA18261VOC1ND
2018-07-09CA85598VOC1ND
2018-07-17CA91979ND
2018-09-13VOC1 200505275ND
2018-09-13VOC1 200505276ND
2018-09-13VOC1 200505266ND
2018-09-19VOC1 200506116ND
2018-09-20VOC1 200506324ND
2018-10-25VOC1 200510568ND
2019-01-30VOC1 200520057ND
2019-06-24VOC1 200538005ND
2019-07-08VOC1 200541172ND
2019-07-08VOC1 200539194ND
2019-07-16VOC1 200541091ND
2019-07-16VOC1 200540648ND
2019-07-16VOC1 200540644ND
2019-09-17VOC1 200549238ND
2019-09-18VOC1 200549465ND
2019-12-10VOC1 200559663ND