Frequent Questions

The operator of a public water system (PWS) is preparing his annual consumer confidence report (CCR). The testing laboratory detected arsenic during the past year at a level less than the maximum contaminant level (MCL), but above the minimum detection li

Specific information regarding contaminants may be available in sanitary surveys and source water assessments, and should be used when available to the operator. If the operator lacks reliable data on the specific source of the contaminant, the report should include one or more of the typical sources listed in 40 CFR Part 141, Subpart O, Appendix A, that is most applicable to the situation (40 CFR 141.153(d)(4)(ix)).
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