Know Your Environment. Protect Your Health.

Chloromethane

Caddo Lake Water Supply Corporation

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.880 ppb21ND - 1.76 ppb
20191.66 ppb21ND - 3.31 ppb
20201.43 ppb21ND - 2.85 ppb
20211.13 ppb21ND - 2.26 ppb
20220.635 ppb21ND - 1.27 ppb
20230.965 ppb21ND - 1.93 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 Lab ID Result
2018-09-20Q1837726002ND
2018-09-20Q18377260031.76 ppb
2019-06-10Q1933418005ND
2019-06-10Q19334180073.31 ppb
2020-10-22Q2041223001ND
2020-10-22Q20412230032.85 ppb
2021-05-24Q21135250082.26 ppb
2021-05-24Q2113525010ND
2022-11-22Q22350790081.27 ppb
2022-11-22Q2235079010ND
2023-06-29Q2325157001ND
2023-06-29Q23251570031.93 ppb