Chloroform
Category: disinfection byproduct
EPA MCL
Not regulated
Status
EPA Regulated
NSF Standard
NSF/ANSI 53
Health Effects
Classified as a probable human carcinogen (Group B2) by EPA. Associated with liver and kidney damage, central nervous system effects. Most abundant trihalomethane in chlorinated water.
Where It Comes From
The most common trihalomethane formed during water chlorination. Part of the TTHM group - regulated under the Stage 2 Disinfectants and Disinfection Byproducts Rule as a component of total trihalomethanes.
Where It's Commonly Found
Present in virtually all chlorinated water. Typically the dominant THM species. Higher levels in warmer water with high organic content.
No individual MCL - regulated as part of TTHMs (0.080 mg/L for total). Individual MCLG is 0.07 mg/L. Found in nearly all chlorinated public water systems.
How to Remove It
Effective Technologies
- activated carbon
- carbon block
- reverse osmosis
Does NOT Remove It
- UV
- ion exchange
- water softener
- mechanical filtration
Official Sources
Related Contaminants
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