Unregulated Contaminant Monitoring Rule (UCMR)

Unregulated contaminants are those that don’t yet have a drinking water standard established by the Environmental Protection Agency (EPA). The purpose of monitoring for these contaminants is to help the EPA decide whether the contaminants should have a standard. As customers, you have a right to know that this data is available.

The Safe Drinking Water Act (SDWA) requires that once every five years the EPA issue a list of unregulated contaminants to be monitored by public water systems (PWSs).

FAQs

• Are public water systems (PWSs) required to report their UCMR 5 results to their customers?
  • Yes, notice may be provided via the media, posting, or through the mail.

 

• Are PWSs with UCMR 5 results above an Maximum Contaminant Levels (MCL(s)) for the final PFAS National Primary Drinking Water Regulation (NPDWR) out of compliance?
  • No. PWSs will be required to comply with the PFAS NPDWR MCLs starting in April 2029; therefore, UCMR 5 results for the regulated PFAS do not indicate compliance or noncompliance with the MCLs. PWSs may work with their state to submit their UCMR 5 monitoring data to meet some or all of the PFAS NPDWR’s initial monitoring requirements, which must be completed by April 2027. Starting in 2029, compliance with the PFAS NPDWR MCLs will be determined by calculating the running annual average (RAA) of quarterly results for each sample point, based on compliance monitoring data reported to the primacy agency.

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Results

Marion County Utilities is an award-winning organization that strives to provide excellent service and a safe, great-tasting water that its customers can use and consume on a daily basis. As such, the Department continuously monitors the drinking water of its customers by sampling for regulated and unregulated contaminants on a regular basis. Staff works diligently to collect any and all samples to uphold its excellent quality while provide safe clean water.

Marion County Eastside Consolidated Public Water System Results

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Resources

The fifth Unregulated Contaminant Monitoring Rule (UCMR 5) was published on December 27, 2021. Here are some helpful links to EPA resources to learn more and access this data.

Summary of health information about UCMR 5 contaminants

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EPA overview on the Fifth Unregulated Contaminant Monitoring Rule

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