Union County, North Carolina
5 ZIP codes · Avg score 80/100 · Grade B · Updated 2026-06-04
Although county size varies, Union County's 5 ZIP codes share reliably safe tap water records and above-average compliance scores.
How Union County Compares
How Union County Compares
Union County scores 7 points above the North Carolina state average (73/100) and 12 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Union County, North Carolina
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 11.8 (asthma 10.3%, diabetes 10.5%)
Estimated additional annual cost per homeowner: $802, driven primarily by flood
Infrastructure: 0.304% avg pipe failure probability, 20% of ZIPs at high risk
42% 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: $802
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
47,579 housing units in Union 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 Union County
Remediation costs are relatively manageable for most homeowners in Union 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 Union 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 Union County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Union County Water System | 167,554 | 15 |
| 2 | City of Monroe, | 43,081 | 8 |
| 3 | Westwood Mhp | 56 | 8 |
| 4 | Marshville, Town of | 3,163 | 6 |
| 5 | Wingate, Town of | 3,950 | 6 |
7 total water systems serve Union County.
All ZIP Codes in Union County
5 ZIP codes tracked in Union County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 28174 | Wingate | 99 | A | 1 | $212K |
| 2 | 28110 | Monroe | 86 | A | 8 (1 health) | $303K |
| 3 | 28173 | Waxhaw | 85 | A | 1 | $559K |
| 4 | 28108 | Mineral Springs | 66 | C | 0 | — |
| 5 | 28103 | Marshville | 62 | C | 5 | $231K |
Recommended Buyer Guides for Union County
Strictly editorial — no paid placements influence which guides appear; the selection draws on NSF certifications and EPA detection records for water systems serving this county.
- 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 Union County, North Carolina
Overview
Union County in North Carolina covers 5 ZIP codes with an average Home Safety Score of B (80/100).
4 of 5 ZIP codes have recorded EPA violations. 1 health-based violation have been documented.
← Back to North Carolina 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.