Water Quality in Saint Peters, MO: No Violations - Grade D
Grade D · Score 45/100 · 4 water systems · Updated 2026-07-18
Saint Peters's water has significant violations. Water testing and filtration are recommended.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Across all 4 water systems serving Saint Peters, MO, federal monitoring data documents zero EPA violations - no MCL exceedances, no monitoring lapses, no enforcement actions anywhere in the compliance history.
Water Quality by ZIP Code in Saint Peters
Saint Peters is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 63376 | D | 45 | 0 | 0 | View report → |
Water Quality Overview
Saint Peters, Missouri receives a water quality grade of D with an overall score of 45 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 4 water systems serving Saint Peters. 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 Peters'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 Peters is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
With 46% of homes built before 1986, Saint Peters 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 Peters 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 Peters
Saint Peters is served by 4 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 74,876 people across 1 ZIP code.
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
The EPA has taken 10 enforcement actions against water systems serving Saint Peters. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Saint Peters
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
EPA Enforcement History
The EPA and state regulators have taken 7 enforcement actions against water systems serving Saint Peters. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-03 | State Order Extension |
| 2025-08-22 | State Informal Action |
| 2025-07-21 | State Informal Action |
| 2025-07-21 | State Informal Enforcement |
| 2022-07-22 | State Informal Action |
| 2022-07-06 | State Order Extension |
| 2021-08-02 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-03.
Saint Peters vs. Nearby Missouri Cities
How Saint Peters's water quality compares to similar cities in Missouri:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Saint Peters | D | 0 | 4 | 74,876 |
| Saginaw | D | 0 | 1 | 73,728 |
| Joplin | B | 24 | 11 | 73,393 |
| Jefferson City | B | 0 | 7 | 70,167 |
Common Questions About Saint Peters Water
These are the most common questions residents search for about water quality in Saint Peters, Missouri:
Is Saint Peters water hard or soft? Water hardness varies by source. Saint Peters's 4 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Saint Peters tap water? Saint Peters's water receives a grade of D (45/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Saint Peters? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Saint Peters vs. Missouri Average
Understanding how Saint Peters 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 Peters.
ZIP Codes in Saint Peters
Saint Peters spans 1 ZIP code. 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.