Lafourche County, Louisiana
11 ZIP codes · Avg score 57/100 · Grade C · Updated 2026-06-04
Current EPA records place Lafourche County in the middle tier for drinking water safety, with 11 ZIP codes showing a range of outcomes.
How Lafourche County Compares
How Lafourche County Compares
Lafourche County scores 14 points below the Louisiana state average (71/100) and 11 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Lafourche County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.9 (asthma 10.2%, diabetes 14.7%)
Estimated additional annual cost per homeowner: $5,341, driven primarily by sea_level
Infrastructure: 0.294% avg pipe failure probability
54.3% of homes built before 1978 (lead paint era)
Violation History (2024–2025)
→ Stable trendEPA violation counts by year across Lafourche County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 3 violations. Past 5 years: 4 total (4 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: $5,341
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
35,244 housing units in Lafourche 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 Lafourche County
Remediation costs are relatively manageable for most homeowners in Lafourche 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 Lafourche 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 Lafourche County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Thibodaux Waterworks | 14,862 | 0 |
| 2 | SCHRIEVER WATER TREATMENT SERVICE AREA | 116,460 | 0 |
| 3 | LAFOURCHE WATER DISTRICT 1 | 81,609 | 0 |
| 4 | ASSUMPTION PARISH WW DISTRICT 1 | 21,366 | 0 |
| 5 | St Mary Parish Water Sewerage Commission 1 | 2,823 | 0 |
All ZIP Codes in Lafourche County
11 ZIP codes tracked in Lafourche County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70310 | Thibodaux | 99 | A | 0 | — |
| 2 | 70374 | Lockport | 80 | B | 0 | $190K |
| 3 | 70301 | Thibodaux | 75 | B | 0 | $218K |
| 4 | 70371 | Kraemer | 60 | C | 0 | — |
| 5 | 70375 | Mathews | 60 | C | 0 | $244K |
| 6 | 70355 | Gheens | 52 | D | 0 | $107K |
| 7 | 70395 | Schriever | 47 | D | 0 | $201K |
| 8 | 70354 | Galliano | 42 | D | 0 | $102K |
| 9 | 70373 | Larose | 42 | D | 0 | $179K |
| 10 | 70345 | Cut Off | 37 | F | 0 | $166K |
| 11 | 70357 | Golden Meadow | 37 | F | 0 | $141K |
Recommended Buyer Guides for Lafourche County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations — federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 54.3% of homes built before 1978
Deep Dive Reports
Detailed analysis for Lafourche County, Louisiana
Overview
Lafourche County in Louisiana covers 11 ZIP codes with an average Home Safety Score of C (57/100).
No EPA violations recorded across any tracked ZIP codes in Lafourche County.
← 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.