Ascension County, Louisiana
11 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-04
Ascension County: 11 ZIP codes, mid-range safety grade.
How Ascension County Compares
How Ascension County Compares
Ascension County scores 8 points below the Louisiana state average (71/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Ascension County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.4 (asthma 9.8%, diabetes 12.6%)
Estimated additional annual cost per homeowner: $4,811, driven primarily by sea_level
Infrastructure: 0.26% avg pipe failure probability
36.3% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Ascension County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 9 violations. Past 5 years: 14 total (14 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $4,811
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
49,710 housing units in Ascension 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 Ascension County
Remediation costs are relatively manageable for most homeowners in Ascension 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 Ascension 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 Ascension County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | City of Gonzales Water System | 16,806 | 9 |
| 2 | DIVERSION WATER- WATER FRONT WEST | 1,548 | 7 |
| 3 | Diversion Water River Highlands | 1,356 | 7 |
| 4 | Plantation Mobile Home Village | 132 | 7 |
| 5 | Salt Bayou Kampground - Vista Sites | 25 | 7 |
14 total water systems serve Ascension County.
All ZIP Codes in Ascension County
11 ZIP codes tracked in Ascension County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70707 | Gonzales | 90 | A | 1 | — |
| 2 | 70346 | Donaldsonville | 81 | B | 1 (1 health) | $187K |
| 3 | 70737 | Gonzales | 75 | B | 1 | $253K |
| 4 | 70769 | Prairieville | 75 | B | 0 | $295K |
| 5 | 70774 | Saint Amant | 74 | B | 7 (1 health) | $244K |
| 6 | 70718 | Brittany | 52 | D | 0 | — |
| 7 | 70725 | Darrow | 52 | D | 0 | — |
| 8 | 70728 | Duplessis | 52 | D | 0 | — |
| 9 | 70738 | Burnside | 50 | D | 0 | — |
| 10 | 70341 | Belle Rose | 47 | D | 0 | $105K |
| 11 | 70778 | Sorrento | 42 | D | 0 | $248K |
Recommended Buyer Guides for Ascension County
Editorial-only picks, screened against the EPA detections on file.
- Best Water Testing Kits — Baseline water quality check for your ZIP
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant peace of mind
Deep Dive Reports
Detailed analysis for Ascension County, Louisiana
Overview
Ascension County in Louisiana covers 11 ZIP codes with an average Home Safety Score of C (63/100).
4 of 11 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.