St. Martin County, Louisiana
3 ZIP codes · Avg score 69/100 · Grade C · Updated 2026-06-04
While St. Martin County avoids the worst tiers, a portion of its 3 ZIP codes have logged violations.
How St. Martin County Compares
How St. Martin County Compares
St. Martin County scores 2 points below the Louisiana state average (71/100) and 1 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
Key Risk Factors
Health risk index: 16.1 (asthma 10.5%, diabetes 15.5%)
Estimated additional annual cost per homeowner: $5,253, driven primarily by sea_level
Infrastructure: 0.293% avg pipe failure probability
55% of homes built before 1978 (lead paint era)
Violation History (2021–2024)
→ Stable trendEPA violation counts by year across St. Martin County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 7 violations. Past 5 years: 12 total (12 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $5,253
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
20,689 housing units in St. Martin County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in St. Martin County
Remediation costs are relatively manageable for most homeowners in St. Martin County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for St. Martin County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in St. Martin County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Cecilia Water Corporation | 12,249 | 9 |
| 2 | City of Breaux Bridge Water System | 8,754 | 8 |
| 3 | Henderson Nina Water System Inc. | 5,136 | 8 |
| 4 | United Water System | 4,446 | 8 |
| 5 | Town of Arnaudville Water System | 3,957 | 8 |
8 total water systems serve St. Martin County.
All ZIP Codes in St. Martin County
3 ZIP codes tracked in St. Martin County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70521 | Cecilia | 94 | A | 1 (1 health) | — |
| 2 | 70517 | Breaux Bridge | 71 | B | 8 (3 health) | $152K |
| 3 | 70582 | Saint Martinville | 42 | D | 0 | $149K |
Recommended Buyer Guides for St. Martin County
Independent picks. EPA-grounded. Matched here.
- Best Lead Paint Test Kits — 55% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Overview
St. Martin County in Louisiana covers 3 ZIP codes with an average Home Safety Score of C (69/100).
2 of 3 ZIP codes have recorded EPA violations. 4 health-based violations have been documented.
← Back to Louisiana water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.