Union County, South Carolina
7 ZIP codes · Avg score 81/100 · Grade B · Updated 2026-07-19
ZipCheckup grade for Union: B.
This ZIP looks solid, with a few items worth a quick check.
Union County earns a high water safety grade - 7 ZIP codes tracked, virtually all compliant.
How Union County Compares
How Union County Compares
Union County scores 3 points above the South Carolina state average (78/100) and 13 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Union County, South Carolina
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 17.3 (asthma 10.9%, diabetes 19.3%)
Estimated additional annual cost per homeowner: $649, driven primarily by energy_code_gap
Infrastructure: 0.464% avg pipe failure probability, 86% of ZIPs at high risk
64.7% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↓ Improving trendEPA violation counts by year across Union County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 15 violations. Past 5 years: 27 total (27 health-based). Health-based violations are declining versus the prior 2-year window.
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: $649
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
13,853 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 serving Union County
8 community water systems serving Union County.
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Show all 8 water systems
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9 total water systems serve Union County.
Systems with the most violations in Union County
5 water systems with recorded EPA violations.
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All ZIP Codes in Union County
7 ZIP codes tracked in Union County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29353 | Jonesville | 94 | A | 5 (1 health) | $111K |
| 2 | 29379 | Union | 94 | A | 4 (1 health) | $103K |
| 3 | 29395 | Jonesville | 94 | A | 5 (1 health) | — |
| 4 | 29364 | Lockhart | 87 | A | 7 (7 health) | $22K |
| 5 | 29031 | Carlisle | 67 | C | 8 (8 health) | $97K |
| 6 | 29015 | Blair | 66 | C | 0 | $113K |
| 7 | 29321 | Buffalo | 66 | C | 0 | $62K |
Recommended Buyer Guides for Union County
Filtered against federal data, fitted to local risks.
- Best Lead Paint Test Kits — 64.7% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Union County, South Carolina
Overview
Union County in South Carolina covers 7 ZIP codes with an average Home Safety Score of B (81/100).
5 of 7 ZIP codes have recorded EPA violations. 18 health-based violations have been documented.
← Back to South 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.