ABSTRACT
In order to be eligible to analyze compliance samples under the Safe Drinking Water Act, regional and principal State laboratories should meet the minimum criteria specified in this manual, should pass an on-site audit at least once every 3 years, and for chemistry must satisfactorily analyze a set of PE samples or other unknown test samples annually. EPA policy also requires that microbiology and radiochemistry laboratories also successfully analyze PE samples. For those laboratories certified for radiochemistry, satisfactory performance on additional PE samples may also be necessary.
