Washington County, Pennsylvania
38 ZIP codes · Avg score 59/100 · Grade C · Updated 2026-06-03
The systems supplying Washington County's 38 ZIP codes vary in performance — most meet minimum standards, but violations in select areas are on record.
How Washington County Compares
How Washington County Compares
Washington County scores 4 points above the Pennsylvania state average (55/100) and 9 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Washington County, Pennsylvania
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Estimated additional annual cost per homeowner: $1,394, driven primarily by energy_code_gap
Infrastructure: 0.518% avg pipe failure probability, 95% of ZIPs at high risk
85.4% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across Washington County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 120 violations. Past 5 years: 286 total (286 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.
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: $1,394
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
57,267 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.
Water Systems with Most Violations
Top 5 systems in Washington County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | TRI CNTY JT MUNI AUTH | 10,100 | 48 |
| 2 | SOUTHWESTERN PA WATER AUTH | 40,000 | 38 |
| 3 | DONEGAL TOWNSHIP | 820 | 25 |
| 4 | ELLSWORTH BORO WATER DEPT | 1,250 | 24 |
| 5 | Bentleyville Muni Authority | 2,600 | 24 |
8 total water systems serve Washington County.
All ZIP Codes in Washington County
38 ZIP codes tracked in Washington County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 15314 | Bentleyville | 72 | B | 10 (3 health) | $165K |
| 2 | 15376 | West Alexander | 72 | B | 25 (3 health) | $204K |
| 3 | 15022 | Charleroi | 71 | B | 4 (2 health) | $113K |
| 4 | 15345 | Marianna | 66 | C | 19 | $141K |
| 5 | 15331 | Ellsworth | 65 | C | 14 (4 health) | $94K |
| 6 | 15020 | Bunola | 63 | C | 0 | $261K |
| 7 | 15067 | New Eagle | 63 | C | 0 | $106K |
| 8 | 15311 | Amity | 63 | C | 0 | $262K |
| 9 | 15323 | Claysville | 63 | C | 0 | $197K |
| 10 | 15325 | Crucible | 63 | C | 0 | — |
| 11 | 15329 | Prosperity | 63 | C | 0 | $240K |
| 12 | 15330 | Eighty Four | 63 | C | 0 | $339K |
| 13 | 15353 | Nineveh | 63 | C | 0 | $243K |
| 14 | 15360 | Scenery Hill | 63 | C | 0 | $229K |
| 15 | 15365 | Taylorstown | 63 | C | 0 | $122K |
| 16 | 15380 | Wind Ridge | 63 | C | 0 | $119K |
| 17 | 15427 | Daisytown | 63 | C | 0 | $167K |
| 18 | 15429 | Denbo | 63 | C | 0 | $63K |
| 19 | 15475 | Republic | 63 | C | 0 | $91K |
| 20 | 15333 | Fredericktown | 61 | C | 19 (11 health) | $207K |
| 21 | 15062 | Monessen | 55 | C | 0 | $87K |
| 22 | 15312 | Avella | 55 | C | 0 | $206K |
| 23 | 15348 | Millsboro | 55 | C | 0 | — |
| 24 | 15364 | Sycamore | 55 | C | 0 | $184K |
| 25 | 15433 | East Millsboro | 55 | C | 0 | $128K |
| 26 | 15313 | Beallsville | 53 | D | 0 | $153K |
| 27 | 15324 | Cokeburg | 53 | D | 0 | — |
| 28 | 15337 | Graysville | 53 | D | 0 | $207K |
| 29 | 15358 | Richeyville | 53 | D | 0 | $108K |
| 30 | 15366 | Van Voorhis | 53 | D | 0 | $227K |
| 31 | 15368 | Vestaburg | 53 | D | 0 | $58K |
| 32 | 15377 | West Finley | 53 | D | 0 | $225K |
| 33 | 15379 | West Middletown | 53 | D | 0 | $108K |
| 34 | 15420 | Cardale | 53 | D | 0 | — |
| 35 | 15447 | Isabella | 53 | D | 0 | $28K |
| 36 | 15450 | La Belle | 53 | D | 0 | $118K |
| 37 | 15063 | Monongahela | 50 | D | 0 | $149K |
| 38 | 15301 | Washington | 45 | D | 0 | $206K |
Recommended Buyer Guides for Washington County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Lead Paint Test Kits — 85.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Washington County, Pennsylvania
Overview
Washington County in Pennsylvania covers 38 ZIP codes with an average Home Safety Score of C (59/100).
6 of 38 ZIP codes have recorded EPA violations. 23 health-based violations have been documented.
← Back to Pennsylvania 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.