Know Your Environment. Protect Your Health.

Chloromethane

Williams Water Supply

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.48 ppb441.50 ppb - 3.30 ppb
20195.30 ppb333.20 ppb - 8.30 ppb
20205.90 ppb225.30 ppb - 6.50 ppb
20215.58 ppb442.80 ppb - 8.80 ppb
20224.50 ppb441.70 ppb - 7.80 ppb
2023N/A00N/A

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 Lab ID Result
2018-02-06OE6222491.90 ppb
2018-05-01OE6528683.20 ppb
2018-08-07OE6952221.50 ppb
2018-11-07OE7380653.30 ppb
2019-05-06OE8039804.40 ppb
2019-08-05OE8454623.20 ppb
2019-11-11OE8922598.30 ppb
2020-08-03OE11563536.50 ppb
2020-11-03OE13968295.30 ppb
2021-02-01OE15732124.80 ppb
2021-05-03OE16831695.90 ppb
2021-08-02OE17788928.80 ppb
2021-11-01OE19155302.80 ppb
2022-02-01OE20350341.70 ppb
2022-06-15OE21184877.80 ppb
2022-08-09OE21534535.50 ppb
2022-11-01OE22008103.00 ppb