Des Moines, IA tap water: what's in it in 2026
Serving 215K residents via Des Moines Water Works · Des Moines, IA drinking water is supplied by Des Moines Water Works. EPA and utility monitoring commonly focus on issues such as Nitrates from agricultural runoff, Atrazine pesticide, Disinfection byproducts. Drought rules, inter-tie agreements, and emergency blending can temporarily move where your water is sourced from—even when the utility name stays the same. Enter your ZIP to see how current source routing and treatment performance show up in federal databases for your system this year.
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Des Moines has significant water quality concerns including nitrates from agricultural runoff. 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.
Des Moines Water Works sued upstream counties for agricultural nitrate pollution -- raising national awareness.
Iowa is the most agriculturally intensive state in the US -- nitrate contamination is severe.
Atrazine is regularly detected in Des Moines source water above health guidelines.
RO removes nitrates, atrazine, and DBPs -- essential for Des Moines residents.
Source: EPA UCMR5 national monitoring dataset · Testing period 2023–2025 · MCL = Maximum Contaminant Level (legally enforceable limit) · Health limit = EPA health advisory threshold
Recommendations by Joe Letorney, 30-year water treatment specialist →
Certified Filter Recommendations
Matched to what's actually in your water
COMMON QUESTIONS
Is Des Moines tap water safe to drink in 2025?
Des Moines 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. Des Moines has nitrates from agricultural runoff which is a significant concern — certified filtration is strongly recommended.
Does Des Moines water have PFAS?
EPA UCMR5 monitoring data for Des Moines (water system IA7048001) 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 Des Moines 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 Des Moines 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 Des Moines?
For Des Moines's water profile — nitrates from agricultural runoff, atrazine pesticide — 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 Des Moines 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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Data reviewed by Joe Letorney, 30-year water treatment specialist →