St. Charles County, Louisiana
10 ZIP codes · Avg score 47/100 · Grade D · Updated 2026-06-04
The latest EPA cycle for St. Charles County covers 10 ZIP codes and shows a low safety grade — systemic compliance gaps have persisted over multiple reporting periods, and the county has not moved out of the bottom tier in recent years.
How St. Charles County Compares
How St. Charles County Compares
St. Charles County scores 24 points below the Louisiana state average (71/100) and 21 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: St. Charles County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.9 (asthma 10%, diabetes 13.4%)
Estimated additional annual cost per homeowner: $5,752, driven primarily by sea_level
Infrastructure: 0.288% avg pipe failure probability
52.1% of homes built before 1978 (lead paint era)
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: $5,752
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
19,906 housing units in St. Charles 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. Charles County
Remediation costs are relatively manageable for most homeowners in St. Charles 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. Charles County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
All ZIP Codes in St. Charles County
10 ZIP codes tracked in St. Charles County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70070 | Luling | 75 | B | 1 | $268K |
| 2 | 70080 | Paradis | 52 | D | 0 | $187K |
| 3 | 70031 | Ama | 47 | D | 0 | $213K |
| 4 | 70057 | Hahnville | 47 | D | 0 | $218K |
| 5 | 70078 | New Sarpy | 47 | D | 0 | — |
| 6 | 70030 | Des Allemands | 42 | D | 0 | $206K |
| 7 | 70039 | Boutte | 42 | D | 0 | $243K |
| 8 | 70079 | Norco | 42 | D | 0 | $232K |
| 9 | 70047 | Destrehan | 37 | F | 0 | $294K |
| 10 | 70087 | Saint Rose | 37 | F | 0 | $211K |
Recommended Buyer Guides for St. Charles 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 Lead Paint Test Kits — 52.1% of homes built before 1978
Deep Dive Reports
Detailed analysis for St. Charles County, Louisiana
Overview
St. Charles County in Louisiana covers 10 ZIP codes with an average Home Safety Score of D (47/100).
1 of 10 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.
What You Can Do
St. Charles County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.
Check for lead in your home
52.1% of homes in this county were built before 1978. Older plumbing and solder can leach lead into drinking water, especially in the morning.