Jefferson Davis County, Louisiana
7 ZIP codes · Avg score 74/100 · Grade B · Updated 2026-06-04
Compared to state averages, Jefferson Davis County scores well — its 7 ZIP codes sit above the baseline for tap water quality.
How Jefferson Davis County Compares
How Jefferson Davis County Compares
Jefferson Davis County scores 3 points above the Louisiana state average (71/100) and 6 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Jefferson Davis County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.8 (asthma 10.4%, diabetes 14.8%)
Estimated additional annual cost per homeowner: $4,324, driven primarily by sea_level
Infrastructure: 0.346% avg pipe failure probability
60.3% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
→ Stable trendEPA violation counts by year across Jefferson Davis County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 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: $4,324
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
12,915 housing units in Jefferson Davis 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 Jefferson Davis County
Remediation costs are relatively manageable for most homeowners in Jefferson Davis 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 Jefferson Davis 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 Jefferson Davis County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Jennings Water System | 9,837 | 4 |
| 2 | Town of Lake Arthur Water System | 2,706 | 4 |
| 3 | Cameron Parish Ww District 11-sweet Lake | 3,507 | 3 |
| 4 | Cameron Parish Ww District 11 - Big Lake | 1,620 | 3 |
| 5 | Jeff Davis Water and Sewer Commission 1 | 9,780 | 3 |
11 total water systems serve Jefferson Davis County.
All ZIP Codes in Jefferson Davis County
7 ZIP codes tracked in Jefferson Davis County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70532 | Elton | 95 | A | 0 | $102K |
| 2 | 70591 | Welsh | 85 | A | 0 | $152K |
| 3 | 70549 | Lake Arthur | 82 | B | 3 | $106K |
| 4 | 70546 | Jennings | 81 | B | 1 (1 health) | $152K |
| 5 | 70640 | Fenton | 65 | C | 1 (1 health) | $99K |
| 6 | 70650 | Lacassine | 60 | C | 0 | — |
| 7 | 70581 | Roanoke | 50 | D | 0 | $201K |
Recommended Buyer Guides for Jefferson Davis County
Filtered against EPA monitoring data and CDC lead-exposure guidance, the guides below skip the generic catalog and connect directly to the contaminants and hazards on file here.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Lead Paint Test Kits — 60.3% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Jefferson Davis County, Louisiana
Overview
Jefferson Davis County in Louisiana covers 7 ZIP codes with an average Home Safety Score of B (74/100).
3 of 7 ZIP codes have recorded EPA violations. 2 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.