EPA Signs Fourth Unregulated Contaminant Monitoring Rule
EPA.gov | December 9
The 1996 Safe Drinking Water Act (SDWA) amendments require that once every five years EPA issue a new list of no more than 30 unregulated contaminants to be monitored by public water systems (PWSs).
The EPA Administrator, Gina McCarthy, signed the fourth Unregulated Contaminant Monitoring Rule (UCMR 4) on December 8, 2016, and EPA is submitting it for publication in the Federal Register (FR). UCMR 4 requires monitoring for 30 chemical contaminants between 2018 and 2020 using analytical methods developed by EPA and consensus organizations. This monitoring provides a basis for future regulatory actions to protect public health.