Coconino County · Arizona · EPA UCMR5 occurrence (2023-2025 monitoring) 2026Q2
PFAS (combined) in Flagstaff water
PFAS detected below the federal limit in Flagstaff.
PFAS (combined)
Detected
Detected in Flagstaff's supply below the federal limit. PFAS are "forever chemicals" that don't break down and accumulate over time. Compounds found: PFBA.
EPA records reflect the public water system, not your home's plumbing. The EPA health goal (MCLG) is the level below which there is no known or expected health risk — it is non-enforceable and often stricter than the federal legal limit (the MCL). A utility appearing on this list does not by itself mean the water is unsafe to drink. The only way to know what is in your specific home is to test your own water.
The health-based goal vs. the legal limit
The federal legal limit (MCL) is the maximum allowed by law. The health-based goal (EPA MCLG / WHO) is a stricter health target — not itself a legal limit.
EPA health goal (MCLG)
No federal health goal set
Federal legal limit (MCL)
4 ppt
Source: EPA National Primary Drinking Water Regulations (MCL / MCLG) · 2026
What removes PFAS (combined)
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Semipermeable membrane filtration
Reverse Osmosis
Pushes water through a fine membrane that removes the dissolved solids most filters miss.
Look for: NSF/ANSI 58 certification
How it works→Activated carbon adsorption
Whole-House Carbon Filter
A point-of-entry carbon bed that strips chlorine, chloramine, and chemical taste from every tap.
Look for: NSF/ANSI 42 certification
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