Prepare for the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6)

The U.S. Environmental Protection Agency (EPA) proposed the Sixth Unregulated Contaminant Monitoring Rule (UCMR 6) in July 2026, requiring public water systems (PWSs) across the United States to monitor drinking water for 30 unregulated contaminants.

UCMR 6 monitoring will include water systems serving 3,300 to more than 10,000 people, as well as 800 randomly selected systems serving fewer than 3,300 people. Sampling is scheduled to take place from January 2028 through December 2030.

Preparing early is essential to meeting UCMR 6 monitoring requirements. Eurofins Drinking Water and Wastewater Testing is working with clients to develop testing plans, establish project budgets, and prepare for upcoming sampling deadlines.

Contact Eurofins Drinking Water and Wastewater Testing today to discuss your UCMR 6 testing requirements and get your water system on the schedule.

UCMR 6 Contaminants and EPA Analytical Methods

UCMR 6 requires monitoring for 30 contaminants across several chemical categories, including ultrashort organofluorine compounds, pesticides, pesticide metabolites, industrial solvents, and chemical intermediates.

Eurofins Drinking Water and Wastewater Testing has validated all four analytical methods required for UCMR 6:

EPA Method 524.3

• 1,1,2,2-Tetrachloroethane
• 1,1,1,2-Tetrachloroethane
• 1,2,3-Trichloropropane (1,2,3-TCP)
• 1,2,4-Trimethylbenzene
• Hexachlorobutadiene
• Naphthalene
• Total 1,3-Dichloropropene (cis- and trans-)

EPA Method 525.3

• 2,4-Dinitrotoluene
• 2,6-Dinitrotoluene
• Anthracene
• Chlorothalonil
• Dichlorvos (DDVP)
• Fluorene
• Isophorone
• Metribuzin
• N,N-Diethyl-m-toluamide (DEET)
• Phorate
• Pyrene
• Tetrachlorvinphos (Stirofos)
• Trifluralin

EPA Method 540

• Chlorpyrifos Oxon
• Phorate Sulfone
• Phorate Sulfoxide

EPA Method 563

• Bistriflimide (TFSI)
• Perfluoro-2-methoxyacetic acid (PFMOAA)
• Perfluoroethanesulfonic acid (PFEtS)
• Perfluoropropanesulfonic acid (PFPrS)
• Perfluoropropanoic acid (PFPrA)
• Trifluoromethanesulfonic acid (TFMS)
• Trifluoroacetic acid (TFA)

Why Choose Eurofins Drinking Water and Wastewater Testing for UCMR 6 Testing?

Selecting a qualified laboratory is critical to successful UCMR 6 compliance. EPA requires laboratories performing UCMR 6 testing to complete its laboratory approval process.

Eurofins Drinking Water and Wastewater Testing brings decades of UCMR experience as an EPA Approved Laboratory and Small Systems contract holder for UCMR1 to UCMR5.

Our preparation for UCMR 6 includes:

• Validated EPA Methods: All four UCMR 6 analytical methods (524.3, 525.3, 540, and 563) have been validated by Eurofins Drinking Water and Wastewater Testing laboratories.
• Experienced Drinking Water Testing Team: More than 25 years of PFAS testing experience, including participation in earlier EPA monitoring programs.
• Established Laboratory Locations: Our Pomona, California, and South Bend, Indiana, laboratories are undergoing approvals for UCMR 6.

With extensive analytical experience and ongoing preparation for UCMR 6, Eurofins Drinking Water and Wastewater Testing is ready to help public water systems plan for the next monitoring cycle.

Start Preparing for UCMR 6 Today

Don't wait until the 2028 sampling period to plan your monitoring program. Work with Eurofins Drinking Water and Wastewater Testing to discuss your analytical needs, develop a testing budget, and prepare your water system for UCMR 6.