Mercer County, Pennsylvania
17 ZIP codes · Avg score 63/100 · Grade C · Updated 2026-06-03
Based on current EPA data, Mercer County's 17 ZIP codes reflect fair but mixed water safety.
How Mercer County Compares
How Mercer County Compares
Mercer County scores 8 points above the Pennsylvania state average (55/100) and 5 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Mercer 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: $1,311, driven primarily by energy_code_gap
Infrastructure: 0.471% avg pipe failure probability, 100% of ZIPs at high risk
74.8% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
↑ Worsening trendEPA violation counts by year across Mercer County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 13 violations. Past 5 years: 20 total (20 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: $1,311
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
33,723 housing units in Mercer 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 Mercer County
Remediation costs are relatively manageable for most homeowners in Mercer 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 Mercer County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | AQUA PA SHENANGO VALLEY WTP | 48,000 | 62 |
| 2 | Aqua Pa Lake Latonka Wtp | 1,600 | 43 |
| 3 | Reynolds Water Company | 2,370 | 39 |
| 4 | Greenville Muni Water Authority | 8,600 | 31 |
| 5 | Summit Estates | 72 | 31 |
23 total water systems serve Mercer County.
All ZIP Codes in Mercer County
17 ZIP codes tracked in Mercer County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 16142 | New Wilmington | 82 | B | 3 | $214K |
| 2 | 16150 | Sharpsville | 82 | B | 2 | $136K |
| 3 | 16145 | Sandy Lake | 71 | B | 3 | $168K |
| 4 | 16154 | Transfer | 71 | B | 8 (1 health) | $167K |
| 5 | 16124 | Fredonia | 70 | B | 23 (2 health) | $165K |
| 6 | 16137 | Mercer | 70 | B | 27 (2 health) | $177K |
| 7 | 16127 | Grove City | 67 | C | 13 | $200K |
| 8 | 16153 | Stoneboro | 65 | C | 11 | $149K |
| 9 | 16125 | Greenville | 64 | C | 31 (5 health) | $126K |
| 10 | 16159 | West Middlesex | 55 | C | 17 | $170K |
| 11 | 16113 | Clark | 53 | D | 0 | $214K |
| 12 | 16114 | Clarks Mills | 53 | D | 0 | $169K |
| 13 | 16130 | Hadley | 53 | D | 0 | $152K |
| 14 | 16133 | Jackson Center | 53 | D | 0 | $181K |
| 15 | 16140 | New Bedford | 53 | D | 0 | $95K |
| 16 | 16143 | Pulaski | 53 | D | 0 | $197K |
| 17 | 16151 | Sheakleyville | 53 | D | 0 | $91K |
Recommended Buyer Guides for Mercer County
Below: editorial picks, no sponsored placements.
- Best Lead Paint Test Kits — 74.8% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Mercer County, Pennsylvania
Overview
Mercer County in Pennsylvania covers 17 ZIP codes with an average Home Safety Score of C (63/100).
10 of 17 ZIP codes have recorded EPA violations. 10 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.