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Public water systems must demonstrate that their water meets health based standards by periodically monitoring for the presence of specific contaminants.

Approved analytical methods must be used when analyzing water samples to meet federal monitoring requirements or to demonstrate compliance with drinking water regulations. EPA reviews and approves methods that can be used.

Laboratories that analyze these compliance samples must be certified by EPA or the State. EPA carries out a program to ensure that laboratories are certified as qualified to conduct analyses on drinking water samples.

National Primary Drinking Water Regulations: Minor Correction to Stage 2 Disinfectants and Disinfection Byproducts Rule and Changes in References to Analytical Methods | PDF Version (83K,  About PDF)

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