Washington County, Ohio
18 ZIP codes · Avg score 65/100 · Grade C · Updated 2026-06-03
Within Washington County, safety data across 18 ZIP codes suggests a fair but uneven system — violations are present and worth checking at the ZIP level.
How Washington County Compares
How Washington County Compares
Washington County scores 5 points above the Ohio state average (60/100) and 3 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Washington County, Ohio
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 15.6 (asthma 10.9%, diabetes 13.8%)
Estimated additional annual cost per homeowner: $1,594, driven primarily by flood
Infrastructure: 0.406% avg pipe failure probability, 63% of ZIPs at high risk
67.8% 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: $1,594
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
27,998 housing units in Washington 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 Washington County
Remediation costs are relatively manageable for most homeowners in Washington 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 Washington 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 Washington County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Putnam Community Water Association Public Water System | 2,744 | 14 |
| 2 | Little Hocking Water Association, Inc. | 9,892 | 9 |
| 3 | HIGHLAND RIDGE W AND S ASSOCIATION INC | 3,022 | 8 |
| 4 | TRI-COUNTY RURAL W AND S DISTRICT | 3,000 | 6 |
| 5 | Marietta City Public Water System | 18,707 | 6 |
15 total water systems serve Washington County.
All ZIP Codes in Washington County
18 ZIP codes tracked in Washington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 45742 | Little Hocking | 83 | B | 0 | $174K |
| 2 | 45767 | New Matamoras | 78 | B | 0 | $123K |
| 3 | 45744 | Lowell | 76 | B | 2 | $170K |
| 4 | 45768 | Newport | 74 | B | 5 (1 health) | $198K |
| 5 | 45786 | Waterford | 74 | B | 6 (1 health) | $195K |
| 6 | 45714 | Belpre | 72 | B | 3 (1 health) | $159K |
| 7 | 45712 | Barlow | 63 | C | 0 | — |
| 8 | 45721 | Coal Run | 63 | C | 0 | — |
| 9 | 45729 | Fleming | 63 | C | 0 | $222K |
| 10 | 45773 | Reno | 63 | C | 0 | $239K |
| 11 | 45784 | Vincent | 63 | C | 0 | $208K |
| 12 | 45787 | Watertown | 63 | C | 0 | — |
| 13 | 45789 | Wingett Run | 63 | C | 0 | — |
| 14 | 45750 | Marietta | 59 | C | 6 | $178K |
| 15 | 45715 | Beverly | 55 | C | 0 | $162K |
| 16 | 45745 | Lower Salem | 55 | C | 0 | $100K |
| 17 | 45746 | Macksburg | 55 | C | 0 | $93K |
| 18 | 45788 | Whipple | 55 | C | 0 | $157K |
Recommended Buyer Guides for Washington County
Eight risk categories drive the selection — PFAS exceedance, lead above EPA action level, pre-1978 housing share, EPA Radon Zone 1, flood-top-risk, wildfire-top-risk, multi-contaminant load, and a baseline fallback — and each category maps to a specific buyer-guide track that surfaces when the county data hits its threshold for that hazard signal.
- Best Lead Paint Test Kits — 67.8% 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 Washington County, Ohio
Overview
Washington County in Ohio covers 18 ZIP codes with an average Home Safety Score of C (65/100).
5 of 18 ZIP codes have recorded EPA violations. 3 health-based violations have been documented.
← Back to Ohio 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.