Harrison County, Mississippi
17 ZIP codes · Avg score 79/100 · Grade B · Updated 2026-06-03
Across all 17 ZIP codes in Harrison County, tap water consistently meets or exceeds federal safety standards.
How Harrison County Compares
How Harrison County Compares
Harrison County scores 2 points below the Mississippi state average (81/100) and 11 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Harrison County, Mississippi
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.2 (asthma 9.6%, diabetes 14.1%)
Estimated additional annual cost per homeowner: $4,761, driven primarily by flood
Infrastructure: 0.281% avg pipe failure probability
44.5% of homes built before 1978 (lead paint era)
Violation History (2022–2024)
→ Stable trendEPA violation counts by year across Harrison County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 33 violations. Past 5 years: 35 total (35 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: $4,761
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
97,273 housing units in Harrison 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 Harrison County
Remediation costs are relatively manageable for most homeowners in Harrison 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 Harrison 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 Harrison County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Echcpud-tradition Subdivision | 557 | 78 |
| 2 | The Oaks Utilities | 797 | 69 |
| 3 | City of Gulfport | 75,056 | 63 |
| 4 | Riverbend Utilities Inc. | 4,834 | 63 |
| 5 | Naval Construction Battal Ctr | 3,347 | 61 |
28 total water systems serve Harrison County.
All ZIP Codes in Harrison County
17 ZIP codes tracked in Harrison County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 39534 | Biloxi | 93 | A | 3 | — |
| 2 | 39535 | Biloxi | 93 | A | 3 | — |
| 3 | 39502 | Gulfport | 88 | A | 10 (2 health) | — |
| 4 | 39505 | Gulfport | 88 | A | 10 (2 health) | — |
| 5 | 39506 | Gulfport | 88 | A | 10 (2 health) | — |
| 6 | 39533 | Biloxi | 84 | B | 3 | — |
| 7 | 39574 | Saucier | 84 | B | 3 (1 health) | $192K |
| 8 | 39540 | Diberville | 75 | B | 4 (2 health) | $199K |
| 9 | 39531 | Biloxi | 74 | B | 3 | $194K |
| 10 | 39571 | Pass Christian | 74 | B | 6 (1 health) | $233K |
| 11 | 39501 | Gulfport | 73 | B | 10 (2 health) | $115K |
| 12 | 39503 | Gulfport | 73 | B | 10 (2 health) | $193K |
| 13 | 39507 | Gulfport | 73 | B | 10 (2 health) | $221K |
| 14 | 39560 | Long Beach | 73 | B | 1 | $211K |
| 15 | 39751 | Mantee | 70 | B | 1 | $97K |
| 16 | 39530 | Biloxi | 69 | C | 3 | $150K |
| 17 | 39532 | Biloxi | 69 | C | 3 | $227K |
Recommended Buyer Guides for Harrison County
Designed to find the guide that fits the county, not the other way around — the system reads EPA detections, FEMA hazard layers, and CDC lead-exposure markers, then outputs the categories that resolve those specific risks for households here, with NSF-certified products surfaced when the matching contaminant appears in the local monitoring data.
- Best Water Filters for Lead — Lead above EPA action level in 1 ZIP code
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Harrison County, Mississippi
Overview
Harrison County in Mississippi covers 17 ZIP codes with an average Home Safety Score of B (79/100).
17 of 17 ZIP codes have recorded EPA violations. 16 health-based violations have been documented.
← Back to Mississippi 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.