EPA is initiating consultation and coordination with federally recognized Indian Tribes on the development of the sixth Unregulated Contaminant Monitoring Rule (UCMR 6) for public drinking water systems (PWSs). Tribes that own or operate a PWS may be particularly interested in UCMR 6.
Under UCMR, EPA collects data for contaminants suspected to be present in drinking water, but that do not have health-based standards set under the Safe Drinking Water Act (SDWA). SDWA requires EPA to issue a new list of no more than 30 unregulated contaminants for monitoring every five years. The data collected during monitoring serve as a primary source of occurrence and exposure information that helps the agency make determinations about future drinking water regulations and other actions to protect public health under SDWA. EPA anticipates that this action will include a nationally representative sample of 800 PWSs serving fewer than 3,300 people, all PWSs serving between 3,300 and 10,000 people (approximately 5,100 PWSs), and all PWSs serving more than 10,000 people (approximately 4,200 PWSs) required to monitor.
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