Ann Arbor, MI tap water: what's in it in 2026
Serving 120K residents via Ann Arbor Water Treatment Services · Ann Arbor, MI drinking water is supplied by Ann Arbor Water Treatment Services. EPA and utility monitoring commonly focus on issues such as PFAS from 3M/Gelman contamination, Lead in older buildings, 1,4-dioxane plume. Across the distribution grid, transmission mains, booster stations, and seasonal source shifts can change disinfectant residuals and disinfection byproduct levels before water reaches older service lines. Cross-check this system picture with your ZIP-level SDWIS and UCMR view so you see the latest detections and violations tied to your address.
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Ann Arbor has significant water quality concerns including pfas from 3m/gelman contamination. EPA legal limits are set based on treatment feasibility — not always on what independent health scientists consider safe. Certified filtration is strongly recommended for this water supply.
Ann Arbor faces a local crisis from the Gelman Sciences 1,4-dioxane plume in groundwater.
1,4-dioxane from industrial dry cleaning operations has contaminated Ann Arbor aquifers for decades.
Michigan statewide PFAS from 3M also affects the broader Ann Arbor water system.
RO filtration is strongly recommended -- 1,4-dioxane and PFAS are the primary concerns.
Source: EPA UCMR5 national monitoring dataset · Testing period 2023–2025 · MCL = Maximum Contaminant Level (legally enforceable limit) · Health limit = EPA health advisory threshold
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COMMON QUESTIONS
Is Ann Arbor tap water safe to drink in 2025?
Ann Arbor water meets EPA legal standards, but meeting legal standards is not the same as being free of health concerns. EPA limits are set based on treatment feasibility, not always on what independent scientists consider safe. Ann Arbor has pfas from 3m/gelman contamination which is a significant concern — certified filtration is strongly recommended.
Does Ann Arbor water have PFAS?
EPA UCMR5 monitoring data for Ann Arbor (water system MI0003342) is shown above. PFAS — sometimes called "forever chemicals" — are synthetic compounds that don't break down in the body. Only reverse osmosis systems or NSF 58-certified carbon block filters reliably remove PFAS from tap water. Standard pitcher filters do not remove PFAS.
Does Ann Arbor water have lead?
Lead in tap water almost always comes from the pipes inside your home or building, not the treatment plant. Homes built before 1986 in Ann Arbor are most at risk because they may have lead solder, brass fittings, or lead service lines. The EPA has no safe level for lead in children. An NSF/ANSI 53-certified filter or reverse osmosis system removes lead at the tap.
What water filter is best for Ann Arbor?
For Ann Arbor's water profile — pfas from 3m/gelman contamination, lead in older buildings — a reverse osmosis system addresses the widest range of contaminants. Under-sink RO (Waterdrop G3P800, Aquasana SmartFlow) is the gold standard for homeowners. Renters can use a countertop RO like the Waterdrop K19-S Countertop RO — zero installation required. Clearly Filtered pitchers are the best non-RO option for PFAS and lead.
How do I get my Ann Arbor water tested?
For the most accurate results for your specific tap, use a certified mail-in lab test rather than relying on city-wide data. SimpleLab Tap Score tests for 100+ contaminants including PFAS, lead, arsenic, and nitrates. Results come with a detailed health assessment and filter recommendations. City-wide EPA data like what you see above is a strong baseline, but your home's plumbing can add contaminants after the water leaves the treatment plant.
As of October 2024, all US water utilities must publish a public inventory of their lead service lines — the pipes connecting the water main to your home. Even if your utility water tests clean at the treatment plant, lead can leach from these pipes into your tap. Homes built before 1986 are most at risk.
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City-wide data is just the start. Enter your ZIP to see your exact water system's EPA report, PFAS levels, and violation history — then get the right filter for your home.
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