Water Quality in Saint Louis, MO: No Violations — Grade D
Grade D · Score 53/100 · 3 water systems · Updated 2026-05-03
Saint Louis's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Saint Louis, MO has zero reported violations — 3 water systems, all compliant.
Water Quality Map: Saint Louis, MO
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Water Quality by ZIP Code in Saint Louis
Water quality varies across Saint Louis's 68 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 63130 | D | 40 | 0 | 0 | View report → |
| 63114 | D | 45 | 0 | 0 | View report → |
| 63122 | D | 45 | 0 | 0 | View report → |
| 63123 | D | 45 | 0 | 0 | View report → |
| 63124 | D | 45 | 0 | 0 | View report → |
| 63125 | D | 45 | 0 | 0 | View report → |
| 63128 | D | 45 | 0 | 0 | View report → |
| 63129 | D | 45 | 0 | 0 | View report → |
| 63135 | D | 45 | 0 | 0 | View report → |
| 63136 | D | 45 | 0 | 0 | View report → |
| 63144 | D | 45 | 0 | 0 | View report → |
| 63111 | D | 50 | 0 | 0 | View report → |
| 63116 | D | 50 | 0 | 0 | View report → |
| 63119 | D | 50 | 0 | 0 | View report → |
| 63121 | D | 50 | 0 | 0 | View report → |
Water Quality Overview
Saint Louis, Missouri receives a water quality grade of D with an overall score of 53 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 3 water systems serving Saint Louis. This is a positive indicator, though it does not guarantee the absence of all contaminants — some substances (like PFAS) are not yet fully regulated.
What Grade D Means
A grade of D indicates significant compliance issues. Saint Louis's water systems have accumulated violations that suggest ongoing water quality challenges. Residents should check their specific ZIP code report and consider water testing or filtration.
Lead Levels
Lead testing data for Saint Louis is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
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.
Radon Risk
Saint Louis is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Saint Louis
Saint Louis is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 21,578 people across 68 ZIP codes.
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
How to Check Your Water in Saint Louis
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
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
Saint Louis vs. Nearby Missouri Cities
How Saint Louis's water quality compares to similar cities in Missouri:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Saint Louis | D | 0 | 3 | 21,578 |
| Cook Sta | C | 0 | 1 | 20,800 |
| Saint James | C | 0 | 1 | 20,800 |
| Vichy | C | 0 | 1 | 20,800 |
Water Quality by ZIP Code in Saint Louis
Water quality varies across Saint Louis's ZIP codes. The table below shows the worst-scoring and best-scoring areas:
| ZIP Code | Score | Grade | Violations | Health-Based |
|---|---|---|---|---|
| 63130 | 40 | D | 0 | 0 |
| 63114 | 45 | D | 0 | 0 |
| 63122 | 45 | D | 0 | 0 |
| 63123 | 45 | D | 0 | 0 |
| 63124 | 45 | D | 0 | 0 |
| 63125 | 45 | D | 0 | 0 |
| 63128 | 45 | D | 0 | 0 |
| 63129 | 45 | D | 0 | 0 |
| 63135 | 45 | D | 0 | 0 |
| 63136 | 45 | D | 0 | 0 |
| 63177 | 63 | C | 0 | 0 |
| 63166 | 63 | C | 0 | 0 |
| 63157 | 63 | C | 0 | 0 |
| 63145 | 63 | C | 0 | 0 |
| 63140 | 63 | C | 0 | 0 |
Water quality scores in Saint Louis range from 40 to 63 — a spread of 23 points. This variation means your specific ZIP code matters significantly.
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? Saint Louis's water receives a grade of D (53/100). No health-based violations have been recorded, but home testing is always recommended.
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. Each ZIP code has its own water quality profile based on the specific water system serving that area. 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
Updated daily.