St. Louis, MO tap water: what’s in it in 2026
Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI
St. Louis draws Mississippi and Missouri river water — two of America's most industrialized waterways. PFAS, DBPs, and lead service lines form the filtration triad I talk about most with STL clients.
Missouri lead mining history is separate from pipe lead, but both contribute to public anxiety. Read your CCR and the service line inventory together.
Bi-state metro quirks mean Illinois versus Missouri addresses may have different utilities entirely. Search by ZIP, not by "St. Louis" alone.
See best water filters for lead removal and what filters remove PFAS.
Check water hardness in St. Louis →
WaterCheckup Safety Score — an independent index from EPA public data and our formula. Not your utility’s official water quality rating, an EPA compliance grade, or a test of water at your tap. How we score →
St. Louis water currently shows no major violations in EPA monitoring data. That said, your home's internal plumbing can add lead or other contaminants after water leaves the treatment plant — especially in homes built before 1986.
St. Louiswater may meet federal EPA limits while still showing contaminants above independent health guidelines (EWG, state advisories). EPA MCLs are often set on treatment feasibility — not a "zero risk" threshold. Compare levels below to health guidelines and state/U.S. utility averages, then see which filter technologies address your profile.
EPA UCMR5 PFAS plus utility/EWG averages from our contaminant bundle. Run a ZIP report for live SDWIS samples at your address.
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 23.64 ppb · MO utility avg: 20.54 ppb
Removes with: RO · Carbon
EWG health guideline: 0.06 ppb (HAA5)
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 21.57 ppb · MO utility avg: 13.95 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 23.44 ppb · MO utility avg: 23.25 ppb
Removes with: RO · Carbon
EWG health guideline: 0.2 ppb
Disinfection byproduct linked to bladder cancer and possible reproductive effects.
Removes with: RO · Carbon
EWG health guideline: 700 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 43.45 ppb · MO utility avg: 62.44 ppb
Removes with: RO · Carbon · Ion exchange
EWG health guideline: 0.15 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 30.97 ppb · MO utility avg: 20.41 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 17.82 ppb · MO utility avg: 13.29 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.72 ppb · MO utility avg: 1.17 ppb
Removes with: RO · Carbon
EWG health guideline: 0.4 ppb
Disinfection byproduct linked to bladder cancer and developmental effects at high exposure.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 2.35 ppb · MO utility avg: 2.49 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 33.94 ppb · MO utility avg: 11.24 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 2.40 ppb · MO utility avg: 1.47 ppb
Removes with: RO · Carbon
EWG health guideline: 0.02 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 3.86 ppb
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 1.22 ppb · MO utility avg: 1.02 ppb
Removes with: RO · Carbon
EWG health guideline: 0.06 ppb
THM component linked to cancer and reproductive harm with long-term exposure.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 2.10 ppb
Removes with: RO · Carbon
EWG health guideline: 0.02 ppb (chromium-6)
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.54 ppb · MO utility avg: 1.19 ppb
Removes with: RO
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 1.04 ppm · MO utility avg: 0.68 ppm
Removes with: RO · Carbon
U.S. and state averages from EWG Tap Water Atlas utilities in our database. For your exact tap, use a ZIP report — home plumbing can differ from utility averages.
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
Reference matrix — not specific brands. NSF-certified carbon blocks, reverse osmosis (NSF 58), and ion-exchange softeners address different contaminants. Product picks below match this profile.
St. Louisutility data is a strong baseline — but lead often comes from your home's pipes, and PFAS can vary by neighborhood. Choose certified lab testing for certainty, or skip straight to NSF-certified filters matched to this profile.
SimpleLab Tap Score mail-in panels test PFAS, lead, nitrates, bacteria, and 100+ contaminants at your kitchen tap. Results in about a week — then pick filtration with real numbers, not guesses.
Tap Score City Test — from $89 →Accredited labs · Best if you have old plumbing, pregnancy, or want proof before installing RO
Get NSF 58 / NSF 53 picks matched to St. Louis's PFAS, lead, and disinfection byproduct profile — reviewed by a 30-year water treatment expert.
Take the 3-question filter quiz →Best when contaminants are already flagged above and you want the right RO or pitcher today
Certified Filter Recommendations
Matched to what's actually in your water
COMMON QUESTIONS
Is St. Louis tap water safe to drink in 2026?
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 G3P600, 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 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 public water systems must publish a public inventory of their lead service lines — the pipes connecting the water main to your home. Even if your public water system 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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Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI