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EWG's Tap Water Database — 2019 UPDATE

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Chloromethane

Signal Hill - City, Water Department

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.

 

44

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012N/A00N/A
2013N/A00N/A
2014ND60ND
2015ND30ND
2016ND20ND
2017ND330ND

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
2014-04-219588-006-1035ND
2014-05-154E15062-01AND
2014-05-154E15062-05AND
2014-10-239588-005-0940ND
2014-11-104K10086-01AND
2014-11-104K10086-05AND
2015-02-245B24073-01AND
2015-04-219588-006-0943ND
2015-10-229588-005-1005ND
2016-04-209588-006-1000ND
2016-10-209588-005-1110ND
2017-07-054790-021-1049ND
2017-07-054790-017-1047ND
2017-07-054790-022-1052ND
2017-08-014790-017-1317ND
2017-08-014790-021-1320ND
2017-08-014790-022-1322ND
2017-08-221805-023-1335ND
2017-08-291805-023-1042ND
2017-09-051805-023-1235ND
2017-09-051805-021-1226ND
2017-09-111805-023-1220ND
2017-09-181805-023-1250ND
2017-09-251805-023-1457ND
2017-10-021805-023-1123ND
2017-10-021805-016-1110ND
2017-10-021805-021-1116ND
2017-10-091805-023-1405ND
2017-10-161805-023-1150ND
2017-10-199588-005-1023ND
2017-10-231805-023-1400ND
2017-10-301805-023-0800ND
2017-11-061805-023-0952ND
2017-11-061805-016-0944ND
2017-11-061805-021-0939ND
2017-11-131805-023-0815ND
2017-11-201805-023-1151ND
2017-11-271805-023-0825ND
2017-12-041805-023-0830ND
2017-12-041805-016-0803ND
2017-12-041805-021-0806ND
2017-12-111805-023-0805ND
2017-12-181805-023-1310ND
2017-12-261805-023-0930ND