Jefferson County, Louisiana
13 ZIP codes · Avg score 72/100 · Grade B · Updated 2026-06-04
Throughout Jefferson County, the 13 monitored ZIP codes show low violation rates and healthy safety scores — a pattern that puts the county well above the state baseline for drinking water quality.
How Jefferson County Compares
How Jefferson County Compares
Jefferson County scores 1 points above the Louisiana state average (71/100) and 4 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Jefferson County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.8 (asthma 9.8%, diabetes 16.2%)
Estimated additional annual cost per homeowner: $5,452, driven primarily by sea_level
Infrastructure: 0.371% avg pipe failure probability, 17% of ZIPs at high risk
Violation History (2021–2025)
↓ Improving trendEPA violation counts by year across Jefferson County water systems. Health-based shown in red, total in blue.
Peak year: 2022 with 25 violations. Past 5 years: 73 total (73 health-based). Health-based violations are declining versus the prior 2-year window.
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: $5,452
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Jefferson County
Remediation costs are relatively manageable for most homeowners in Jefferson 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 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 County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | NEW ORLEANS CARROLLTON WATER WORKS | 334,903 | 74 |
| 2 | New Orleans Algiers Water Works | 52,785 | 74 |
| 3 | Lafayette Mhp Llc | 188 | 72 |
| 4 | Giving Hope Retreat | 45 | 72 |
| 5 | Shreveport Water System | 192,378 | 35 |
13 total water systems serve Jefferson County.
All ZIP Codes in Jefferson County
13 ZIP codes tracked in Jefferson County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70302 | Thibodaux | 95 | A | 0 | — |
| 2 | 70096 | Westwego | 89 | A | 6 (1 health) | — |
| 3 | 70054 | Gretna | 88 | A | 2 | — |
| 4 | 70158 | New Orleans | 84 | B | 18 (8 health) | — |
| 5 | 70183 | New Orleans | 84 | B | 18 (8 health) | — |
| 6 | 70094 | Westwego | 74 | B | 6 (1 health) | $155K |
| 7 | 70053 | Gretna | 73 | B | 2 | $226K |
| 8 | 70056 | Gretna | 73 | B | 2 | $223K |
| 9 | 71136 | Shreveport | 70 | B | 35 (27 health) | — |
| 10 | 70121 | New Orleans | 64 | C | 18 (8 health) | $237K |
| 11 | 70123 | New Orleans | 64 | C | 18 (8 health) | $318K |
| 12 | 70058 | Harvey | 37 | F | 0 | $195K |
| 13 | 70072 | Marrero | 37 | F | 0 | $191K |
Recommended Buyer Guides for Jefferson County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Jefferson County, Louisiana
Overview
Jefferson County in Louisiana covers 13 ZIP codes with an average Home Safety Score of B (72/100).
10 of 13 ZIP codes have recorded EPA violations. 61 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.