Fifth Unregulated Contaminant Monitoring Rule | US EPA
https://19january2021snapshot.epa.gov/dwucmr/fifth-unregulated-contaminant-monitoring-rule_.html
WEBJan 19, 2021 · The proposed fifth Unregulated Contaminant Monitoring Rule (UCMR 5) was signed on January 14, 2021. UCMR 5, as proposed, would require sample collection for 30 chemical contaminants between 2023 and 2025 using analytical methods developed by EPA and consensus organizations.
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