St. Louis
Is St. Louis tap water safe to drink?
Use extra caution — St. Louis scores 59/100. This report aggregates EPA drinking water data across 3 local systems in St. Louis. We found 197 total violations (128 unresolved).
Real-Time Environment
Live: 11:00 AM☀️ No active precipitation. Rainfall can impact surface water turbidity and pollutant runoff in St. Louis.
Water Quality Impact
🛡️ Home Water Treatment Needs
Should you invest in filtration or softening for your home in St. Louis?
Expert Advice
Given the safety margin, a Carbon Block or sediment filter is recommended to improve taste and remove trace particulates.
Buying a Filter?
Filter requirements and certified reduction benchmarks for St. Louis tap water.
Baby Formula Safety
Infant formula preparation risks, nitrate levels, and lead pipe guidance in St. Louis.
Homebuyer's Perspective
Evaluating water infrastructure in St. Louis protects plumbing and helps estimate water heater longevity. With a score of 59/100, we recommend budgeting for high-quality point-of-entry filtration systems to protect your home's value.
Health & Family Safety
Residents should monitor Lead (90th percentile) levels. Pregnant women and families with young children should consult the specific EPA health goals listed below.
View Health Risk Glossary →Compliance Record for St. Louis
Based on EPA SDWIS violation records and contaminant test results for all water systems serving St. Louis.
Frequently Asked Questions
Is St. Louis tap water safe to drink?
Use extra caution — St. Louis scores 59/100.
How many water systems serve St. Louis?
St. Louis is served by 3 public water systems in our latest EPA-backed dataset.
How can I check water quality for my exact address in St. Louis?
Use the WaterQ search tool to look up your ZIP code and view nearby systems, contaminant levels, and recent violations for St. Louis.
What is the water quality score for St. Louis?
The water quality score for St. Louis is 59 out of 100, based on EPA contaminant data, violation history, and testing results across the 3 systems serving the city.
What are the top contaminants in St. Louis?
The top contaminants detected in St. Louis include Lead (90th percentile). View detailed information on our contaminants page.
St. Louis Water Quality Summary
St. Louis, MO receives a water quality score of 59/100 (Grade D) based on EPA Safe Drinking Water Information System (SDWIS) compliance data for 3 public water systems serving the area.
St. Louis's water quality score is below the national average, indicating a history of EPA violations or elevated contaminant levels. Residents are encouraged to check their specific water system report and consider additional filtration.
St. Louis's score of 59 is 19 points below the Missouri state average of 78, and below the nationwide average of roughly 78/100 across all U.S. states.
For prospective homebuyers looking at St. Louis, Missouri, this large city distributes its water through three distinct systems located in the Midwest confluence of the Mississippi and Missouri rivers. The municipal supply exhibits average performance, suggesting that the surrounding agricultural plains present ongoing quality challenges for the area's water infrastructure. While the tap water serves the community daily, its moderate quality standing suggests that residents may want to look closer at the specific system servicing their potential home.
Water quality data is sourced from the U.S. EPA SDWIS database and updated quarterly. Learn about our scoring methodology → Read our Missouri water quality rankings report →
Key Contaminants
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Water Systems Serving St. Louis (3)
Check Your Specific Address
Water quality can vary by neighborhood in St. Louis.
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