Know Your Environment. Protect Your Health.

Chloromethane

South Grafton Water District

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.00 ppb331.80 ppb - 2.10 ppb
2019N/A00N/A
2020N/A00N/A
2021N/A00N/A
20220.178 ppb41ND - 0.710 ppb
20230.0500 ppb202ND - 0.500 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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 Result
2018-01-081.80 ppb
2018-04-022.10 ppb
2018-04-022.10 ppb
2022-08-010.710 ppb
2022-09-06ND
2022-10-03ND
2022-11-07ND
2023-02-06ND
2023-02-06ND
2023-03-06ND
2023-03-06ND
2023-04-03ND
2023-04-03ND
2023-05-01ND
2023-05-01ND
2023-05-01ND
2023-06-12ND
2023-06-12ND
2023-07-10ND
2023-07-10ND
2023-08-070.500 ppb
2023-08-070.500 ppb
2023-09-05ND
2023-09-05ND
2023-10-02ND
2023-11-06ND
2023-12-04ND