Water Quality in Saint Louis, MO: 8 Violations Recorded for Mapped Water Systems
3 water systems · 46 directly mapped ZIP records
Available EPA records report 8 violations across 46 directly mapped ZIP records with known counts for Saint Louis. This is compliance evidence, not a property-level tap-water verdict.
Data: EPA Safe Drinking Water Information System (SDWIS)
Water Quality by ZIP Code in Saint Louis
This table shows typed EPA water evidence only. Missing violation counts are displayed as N/A, not zero.
| ZIP Code | Violations | Health | |
|---|---|---|---|
| 63101 | 8 | 0 | View report → |
| 63102 | 8 | 0 | View report → |
| 63103 | 8 | 0 | View report → |
| 63104 | 8 | 0 | View report → |
| 63105 | 8 | 0 | View report → |
| 63106 | 8 | 0 | View report → |
| 63107 | 8 | 0 | View report → |
| 63108 | 8 | 0 | View report → |
| 63109 | 8 | 0 | View report → |
| 63110 | 8 | 0 | View report → |
| 63111 | 8 | 0 | View report → |
| 63112 | 8 | 0 | View report → |
| 63113 | 8 | 0 | View report → |
| 63115 | 8 | 0 | View report → |
| 63116 | 8 | 0 | View report → |
Water Quality Overview
Saint Louis, Missouri has directly mapped EPA water-system data for 46 ZIP codes. This page reports typed compliance facts and does not relabel the multi-source Home Safety Score as a drinking-water grade.
The available EPA records report 8 violations (all classified as monitoring/reporting type in the available record) across 46 directly mapped ZIP records with reported counts.
Lead Levels
The average of the reported 90th-percentile lead results across the ZIP codes of Saint Louis is 0.0013 mg/L; the EPA action level of 0.015 mg/L applies to a water system's own 90th-percentile result and is not a safety threshold (EPA's health goal for lead is zero). No exceedances appear among the 46 ZIP records with known lead status.
With 84% of homes built before 1986, Saint Louis has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Water Systems Serving Saint Louis
Saint Louis is served by 3 community water systems regulated under the Safe Drinking Water Act. About 891,907 people live in the area (68 ZIP codes, Census); this is not the systems' reported service population.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
EPA records list enforcement actions against water systems serving Saint Louis. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Saint Louis
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels and violation history
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Saint Louis Water Systems
The following contaminants have been detected or caused violations across Saint Louis's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Atrazine | Organic | 0.003 mg/L | 62 | 31 | No |
| Lead and Copper Rule | Treatment Technique | N/A | 31 | 31 | No |
| Lead and Copper Rule Revisions | Treatment Technique | N/A | 31 | 31 | No |
The standard column shows the EPA Maximum Contaminant Level (MCL) except for lead and copper, whose value is an action level that triggers corrective steps and is not an MCL. Health-based violations are MCL, MRDL and treatment-technique violations.
EPA Enforcement History
The EPA and state regulators have taken enforcement actions against water systems serving Saint Louis. Recent actions:
| Date | Action Type |
|---|---|
| 2024-05-20 | State Order Extension |
| 2023-03-24 | State Informal Action |
| 2023-02-08 | State Informal Action |
| 2023-02-08 | State Informal Enforcement |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2024-05-20.
Saint Louis vs. Nearby Missouri Cities
How Saint Louis's water quality compares to similar cities in Missouri:
| City | Direct EPA ZIPs | Violations | Systems | Population |
|---|---|---|---|---|
| Saint Louis | 46 | 8 | 3 | 891,907 |
| Earth City | 1 | 0 | 1 | 1,111,000 |
| Kansas City | 50 | 60 | 20 | 602,147 |
| Springfield | 9 | 17 | 9 | 236,423 |
Water Quality by ZIP Code in Saint Louis
EPA coverage and recorded violations can differ across Saint Louis's ZIP codes. Missing counts are shown as unavailable, not zero:
| ZIP Code | Violations | Health-Based |
|---|---|---|
| 63101 | 8 | 0 |
| 63102 | 8 | 0 |
| 63103 | 8 | 0 |
| 63104 | 8 | 0 |
| 63105 | 8 | 0 |
| 63106 | 8 | 0 |
| 63107 | 8 | 0 |
| 63108 | 8 | 0 |
| 63109 | 8 | 0 |
| 63110 | 8 | 0 |
| 63111 | 8 | 0 |
| 63112 | 8 | 0 |
| 63113 | 8 | 0 |
| 63115 | 8 | 0 |
| 63116 | 8 | 0 |
Common Questions About Saint Louis Water
These are the most common questions residents search for about water quality in Saint Louis, Missouri:
Is Saint Louis water hard or soft? Water hardness varies by source. Saint Louis's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Saint Louis tap water? City-level EPA records cannot determine safety at a specific tap. No health-based violations are recorded across 46 directly mapped ZIP records with known counts, but this is not a property-level safety guarantee.
What is the best water filter for Saint Louis? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Saint Louis vs. Missouri Average
Understanding how Saint Louis compares to the broader Missouri average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Saint Louis.
ZIP Codes in Saint Louis
Saint Louis spans 68 ZIP codes. EPA water-system coverage is available for 46 directly mapped ZIP codes. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Source reporting periods vary. See each cited source for its publication schedule.