NSF Consumer Information: Contaminant Guide

> About the NSF Mark
> Bottled Water
- » Types and Treatment of Bottled Water
- » The NSF Bottled Water Certification Program
- » Frequently Asked Questions
- » Fact Kit
- » Search for NSF-Certified Products
- » Receive Email Updates
- » Contact NSF
> Consumer Fact Kits
> Dietary Supplements
- » Understanding Dietary Supplement Labels
- » The Importance of Certification
- » Frequently Asked Questions
- » Audio Public Service Announcements
- » Public Health Fact Sheets
- » Additional Information and Links
- » Search for NSF Certified Products
- » Receive Email Updates
- » Contact NSF
> Faucets
- » Frequently Asked Questions
- » Search for NSF-Certified Products
- » Receive Email Updates
- » Contact NSF
> Food Safety
- » In the Home
- » Shopping and Storage
- » Dining Out
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Audio Public Service Announcements
- » Additional Links
- » Search for Certified Products
- » Receive Email Updates
- » Contact NSF
> Green Living
- » Carpet Sustainability
- » Conservation
- » Earth Day
- » Green Cleaning
- » Organics
- » Rainwater Catchment
- » Recycling
- » Wastewater Treatment
- » Water Sense^SM
- » Watershed Protection
- » Public Service Announcements
- » Public Health Fact Sheets
- » Receive Email Updates
- » Contact NSF
> Home & Family
- » Dietary Supplements
- » Disaster Readiness
- » Drinking Water
- » Faucets
- » Food Safety
- » Germ Hot Spots
- » Pool and Spa
- » Residential Appliances
- » Residential Plumbing
- » Consumer Fact Sheets
- » Receive Email Updates
- » Contact NSF
- » Additional Links
> Health Resource Links
> News for Consumers
> Organic Certification
- » Organic Standards Summary
- » Organic Certification Process
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Additional Links
- » Contact NSF
> Play Safer
- » Recreational Water Safety
- » Toy Safety
- » Public Service Announcements
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Receive Email Updates
- » Contact NSF
> Plumbing
- » Consumer Fact Kits
- » Search for Certified Products
- » Receive Email Updates
- » Contact NSF
> Recreational Water Safety
- » Pool & Spa Safety Tips
- » Equipment Standards
- » Tips for Opening a Seasonal Pool
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Additional Information
- » Search for NSF Certified Products
- » Receive Email Updates
- » Contact NSF
> Residential Appliances
- » Residential Dishwashers
- » Clothes Washers
- » Clothes Dryers
- » Other Products for the Home
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Search for NSF Certified Products
- » Receive Email Updates
- » Contact NSF
> Scrub Club®
> Search for NSF-Certified Products
> Sports Supplements
- » Program Overview
- » List of Prohibited Substances
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Additional Links
- » Search for NSF Certified Products
- » Receive Email Updates
- » Contact NSF
> Wastewater Treatment
- » Alternative Residential Systems
- » Compost Toilets
- » Incinerating Toilets
- » Septic Systems
- » Septic Tank Filters
- » Chlorine Disinfection
- » Frequently Asked Questions
- » Consumer Fact Kits
- » Additional Links
- » Search for NSF Certified Products
- » Receive Email Updates
- » Contact NSF
> Water Treatment
- » Consumer Confidence Reports
- » Contaminant Guide
- » Home Water Treatment
- » Well Water
- » Frequently Asked Questions
- » View Water Fact Kit
- » Other Consumer Fact Kits
- » Public Service Announcements
- » Search for NSF-Certified Products
- » Receive Email Updates
- » Contact NSF

Look for the mark and you'll find a safer product.

Chlorination By-Products (Trihalomethanes)
Maximum Contaminant Level (MCL)	0.08 mg/L
Potential Health Effects (from ingestion of water)	Cancer
Potential Source of Contaminant	By-product of chlorination in drinking water
Applicable NSF/ANSI Standard(s)	Standard 53
Water Treatment Technologies Certified by NSF for Reduction of this Contaminant	Filtration (i.e. carbon/charcoal)
Special Notes	This contaminant is part of the VOC category. Water treatment products certified by NSF for VOCs will be effective for reducing this contaminant.