Concordia County, Louisiana
5 ZIP codes · Avg score 74/100 · Grade B · Updated 2026-06-04
Unlike many counties its size, Concordia County keeps violation rates low — all 5 ZIP codes score at or above the state average for tap water safety, with no systemic concerns flagged in the current data set.
How Concordia County Compares
How Concordia County Compares
Concordia County scores 3 points above the Louisiana state average (71/100) and 6 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Concordia County, Louisiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 18.2 (asthma 11.1%, diabetes 19.8%)
Estimated additional annual cost per homeowner: $2,242, driven primarily by flood
Infrastructure: 0.356% avg pipe failure probability, 40% of ZIPs at high risk
55.4% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Concordia County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 21 violations. Past 5 years: 33 total (33 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: $2,242
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
9,318 housing units in Concordia 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 Concordia County
Remediation costs are relatively manageable for most homeowners in Concordia 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 Concordia 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 Concordia County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Town of Ferriday Water System | 4,193 | 74 |
| 2 | City of Vidalia Water System | 6,354 | 74 |
| 3 | Concordia Waterworks District 1 | 6,921 | 70 |
| 4 | Town of Clayton Water System | 723 | 70 |
| 5 | Lake St John Waterworks District 1 | 2,067 | 70 |
7 total water systems serve Concordia County.
All ZIP Codes in Concordia County
5 ZIP codes tracked in Concordia County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 71354 | Monterey | 90 | A | 1 | $103K |
| 2 | 71378 | Wisner | 84 | B | 9 (3 health) | $124K |
| 3 | 71373 | Vidalia | 79 | B | 4 (1 health) | $120K |
| 4 | 71316 | Acme | 60 | C | 0 | — |
| 5 | 71334 | Ferriday | 55 | C | 70 (41 health) | $80K |
Recommended Buyer Guides for Concordia County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 55.4% of homes built before 1978
- 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 Concordia County, Louisiana
Overview
Concordia County in Louisiana covers 5 ZIP codes with an average Home Safety Score of B (74/100).
4 of 5 ZIP codes have recorded EPA violations. 45 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.