To access your town or city's water-quality report, visit
www.epa.gov or call the EPA's safe-drinking-water
hot line at 800-426-4791.
The EPA recommends that private well owners have their water
tested annually. To find a state-certified water-testing lab, visit
www.epa.gov.
NSF International (formerly the National Sanitation Foundation)
certifies filtration systems according to how well they reduce
contaminants. Look for the NSF stamp to see if a system is
effective against a specific contaminant.