Bay Saint Louis, MS Water Safety: 62/100 (2026)
2 ZIP codes · 6 water systems · Updated 2026-06-04
Bay Saint Louis's water quality grade in MS reflects a middle-ground assessment — service areas range from fully compliant to violation-flagged in current EPA records.
How Bay Saint Louis Compares
Data: EPA SDWIS Last verified: 2026-06-04
Bay Saint Louis Water: The Quick Version
- Estimated remediation: $2,150 per household.
- CDC health risk index: 14.82 — above typical levels.
Water Systems Serving Bay Saint Louis
Multiple utilities divide Bay Saint Louis, MS's water service — 3 leading providers among 6 on the federal register.
Overview
We track water quality and home safety data for 2 ZIP codes in Bay Saint Louis, Mississippi, covering 6 community water systems serving approximately 15,471 people.
No EPA violations recorded across any ZIP codes in Bay Saint Louis — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Bay Saint Louis: C (62/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Bay Saint Louis water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Bay Saint Louis
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 2 ZIP codes
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 39520 | D | Hancock County Water & Sewer | 3,254 |
| 39521 | B | STENNIS SPACE CENTER | 4,700 |
All ZIP Codes in Bay Saint Louis
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
Updated daily.
CDC Health Data for Bay Saint Louis
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Bay Saint Louis: Remediation Cost in Perspective
How does remediation fit within the broader financial picture for Bay Saint Louis homeowners? The equity share is moderate — large enough that treating it as a real planning consideration makes sense, and manageable enough that most homeowners have a clear path to addressing documented water and safety issues when they approach the commitment with deliberate advance budgeting rather than as an unplanned expense.
Remediation costs are moderate relative to home values in Bay Saint Louis. The estimated $1,500–$3,250 range is manageable for most homeowners but still worth budgeting for. Home values are 59% above the Mississippi average.
Climate-Related Water Risk for Bay Saint Louis
Substantially more flood exposure than most communities appears in Bay Saint Louis's NFIP record — 6055 documented claims and 100% of ZIP codes in FEMA flood zones. That exposure level makes the water-quality implications of flooding an active planning consideration rather than a background one.
Bay Saint Louis has a significant flood history with 6,055 FEMA flood insurance claims on record, averaging $54,002 per claim. With 100% of ZIP codes in FEMA-designated flood zones, flood risk is a major concern for homeowners and water quality.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$2,150</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Bay Saint Louis
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
Deep Dive Reports
Detailed analysis for Bay Saint Louis, MS