St. Tammany Parish, Louisiana
19 ZIP codes · Avg score 90/100 · Grade A · Updated
ZipCheckup grade for St. Tammany Parish: A.
No federal data flags a major home-safety concern for this ZIP.
Compared to state averages, St. Tammany Parish scores well - its 19 ZIP codes sit above the baseline for tap water quality.
How St. Tammany Parish Compares
How St. Tammany Parish Compares
St. Tammany Parish scores 2 points below the Louisiana state average (92/100) and 17 points above the national average (73/100).
Data: ZipCheckup Home Safety Score model 4.0.0; EPA SDWIS, UCMR 5, EPA radon zones, EPA AirData Last verified:
ZIP Code Risk Map
Water Quality Map: St. Tammany Parish, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.8 (asthma 9.5%, diabetes 13.3%)
Estimated additional annual cost per homeowner: $4,819, driven primarily by sea_level
37.3% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across St. Tammany Parish water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 7 violations. Past 5 years: 20 total (20 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
Parish Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Modeled area-level indicator, not a failure probability. Sources: Census ACS housing age, EPA DWINS infrastructure needs, EPA SDWIS violations, and EPA lead indicators.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $4,819
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
107,240 housing units in St. Tammany Parish
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. Tammany Parish
Remediation costs are relatively manageable for most homeowners in St. Tammany Parish, 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. Tammany Parish residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving St. Tammany Parish
8 community water systems serving St. Tammany Parish.
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Show all 8 water systems
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37 total water systems serve St. Tammany Parish.
Systems with the most violations in St. Tammany Parish
5 water systems with recorded EPA violations.
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All ZIP Codes in St. Tammany Parish
19 ZIP codes tracked in St. Tammany Parish.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 70420 | Abita Springs | 97 | A | 3 (1 health) | $278K |
| 2 | 70431 | Bush | 97 | A | 5 (3 health) | $242K |
| 3 | 70448 | Mandeville | 97 | A | 4 | $324K |
| 4 | 70447 | Madisonville | 92 | A | 8 (1 health) | $391K |
| 5 | 70471 | Mandeville | 92 | A | 8 (1 health) | $370K |
| 6 | 70460 | Slidell | 91 | A | 14 (8 health) | $184K |
| 7 | 70461 | Slidell | 90 | A | 21 (10 health) | $267K |
| 8 | 70435 | Covington | 87 | A | 12 (6 health) | $272K |
| 9 | 70433 | Covington | 83 | B | 19 (7 health) | $316K |
| 10 | 70452 | Pearl River | 83 | B | 43 (13 health) | $220K |
| 11 | 70458 | Slidell | 83 | B | 57 (20 health) | $227K |
| 12 | 70434 | Covington | — | — | — | |
| 13 | 70445 | Lacombe | — | — | 4 | $220K |
| 14 | 70457 | Saint Benedict | — | — | — | |
| 15 | 70459 | Slidell | — | — | — | |
| 16 | 70463 | Sun | — | — | — | |
| 17 | 70464 | Talisheek | — | — | — | |
| 18 | 70469 | Slidell | — | — | — | |
| 19 | 70470 | Mandeville | — | — | — |
Recommended Buyer Guides for St. Tammany Parish
Editorial methodology pairs each documented risk in this county with the buyer category that addresses it, drawing on water-quality detections, housing-stock lead exposure, EPA Radon Zone designation, and FEMA flood and wildfire ratings. NSF-certified options surface where applicable, and products that match the specific contaminant take priority.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for St. Tammany Parish, Louisiana
Overview
St. Tammany Parish in Louisiana covers 19 tracked ZIP records with an average Home Safety Score of A (90/100) across 11 scored records.
12 of 12 ZIP codes with a reported violation count in the available EPA record have recorded EPA violations. 40 health-based violations appear in the available health breakdown.
← Back to Louisiana Home Safety Profile
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- PFAS screening: EPA UCMR 5
- Radon zones: EPA Map of Radon Zones
- Air quality: EPA AirData annual AQI
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.