St. Louis, MO tap water: what's in it in 2025
Serving 300K residents via Missouri American Water -- St. Louis · St. Louis, MO drinking water is supplied by Missouri American Water -- St. Louis. EPA and utility monitoring commonly focus on issues such as Mississippi River contamination, Lead pipes, Industrial legacy. 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.
St. Louis has significant water quality concerns including mississippi river 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.
St. Louis draws from the Missouri and Mississippi Rivers -- both receive heavy industrial discharge.
St. Louis has significant lead service line infrastructure from the 19th and early 20th century.
Missouri has a legacy of industrial pollution including Superfund sites near the water supply.
Lead and DBP filtration are both priorities for St. Louis residents.
Source: EPA UCMR5 national monitoring dataset · Testing period 2023–2025 · MCL = Maximum Contaminant Level (legally enforceable limit) · Health limit = EPA health advisory threshold
Based on St. Louis's water profile above, here's the exact system we recommend — and why it's right for this water supply specifically.
COMMON QUESTIONS
Is St. Louis tap water safe to drink in 2025?
St. Louis 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. St. Louis has mississippi river contamination which is a significant concern — certified filtration is strongly recommended.
Does St. Louis water have PFAS?
EPA UCMR5 monitoring data for St. Louis (water system MO2024499) 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 St. Louis 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 St. Louis 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 St. Louis?
For St. Louis's water profile — mississippi river contamination, lead pipes — 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 D4 — zero installation required. Clearly Filtered pitchers are the best non-RO option for PFAS and lead.
How do I get my St. Louis 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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