Water Quality in Bay Saint Louis, MS: No Violations — Grade C
Grade C · Score 62/100 · 2 water systems · Updated 2026-05-03
Bay Saint Louis's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Not one violation appears in MS's EPA file for Bay Saint Louis — 2 monitored systems, all clear.
Water Quality by ZIP Code in Bay Saint Louis
Water quality varies across Bay Saint Louis's 2 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 39520 | D | 50 | 0 | 0 | View report → |
| 39521 | B | 73 | 0 | 0 | View report → |
Water Quality Overview
Bay Saint Louis, Mississippi receives a water quality grade of C with an overall score of 62 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 2 water systems serving Bay 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 C Means
A grade of C indicates moderate compliance issues. Bay Saint Louis's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
Lead testing data for Bay Saint Louis is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
Water Systems Serving Bay Saint Louis
Bay Saint Louis is served by 2 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 11,100 people across 2 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 Bay 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
Bay Saint Louis vs. Nearby Mississippi Cities
How Bay Saint Louis's water quality compares to similar cities in Mississippi:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Bay Saint Louis | C | 0 | 2 | 11,100 |
| Wiggins | A | 11 | 5 | 11,125 |
| Quitman | B | 5 | 5 | 10,875 |
| Tunica | B | 6 | 2 | 11,379 |
Common Questions About Bay Saint Louis Water
These are the most common questions residents search for about water quality in Bay Saint Louis, Mississippi:
Is Bay Saint Louis water hard or soft? Water hardness varies by source. Bay Saint Louis's 2 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Bay Saint Louis tap water? Bay Saint Louis's water receives a grade of C (62/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Bay Saint Louis? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Bay Saint Louis vs. Mississippi Average
Understanding how Bay Saint Louis compares to the broader Mississippi 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 Bay Saint Louis.
ZIP Codes in Bay Saint Louis
Bay Saint Louis spans 2 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.