Williamsburg County, South Carolina
8 ZIP codes · Avg score 81/100 · Grade B · Updated 2026-07-19
ZipCheckup grade for Williamsburg: B.
This ZIP looks solid, with a few items worth a quick check.
Although county size varies, Williamsburg County's 8 ZIP codes share reliably safe tap water records and above-average compliance scores.
How Williamsburg County Compares
How Williamsburg County Compares
Williamsburg 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: Williamsburg 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: 16.4 (asthma 10.7%, diabetes 19.5%)
Estimated additional annual cost per homeowner: $3,470, driven primarily by sea_level
Infrastructure: 0.344% avg pipe failure probability, 25% of ZIPs at high risk
53.3% of homes built before 1978 (lead paint era)
Violation History (2021–2023)
→ Stable trendEPA violation counts by year across Williamsburg County water systems. Health-based shown in red, total in blue.
Peak year: 2023 with 4 violations. Past 5 years: 7 total (7 health-based).
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: $3,470
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
15,526 housing units in Williamsburg 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 Williamsburg County
Remediation costs are relatively manageable for most homeowners in Williamsburg 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 Williamsburg County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Williamsburg County
8 community water systems serving Williamsburg County.
- A
- B
- B
- B
- A
- A
Show all 8 water systems
- A
- A
10 total water systems serve Williamsburg County.
Systems with the most violations in Williamsburg County
3 water systems with recorded EPA violations.
- B
- A
- B
All ZIP Codes in Williamsburg County
8 ZIP codes tracked in Williamsburg County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29564 | Lane | 97 | A | 1 | $79K |
| 2 | 29056 | Greeleyville | 94 | A | 2 | $74K |
| 3 | 29560 | Lake City | 85 | A | 0 | $108K |
| 4 | 29556 | Kingstree | 83 | B | 10 (2 health) | $101K |
| 5 | 29518 | Cades | 73 | B | 0 | $151K |
| 6 | 29580 | Nesmith | 73 | B | 0 | $86K |
| 7 | 29590 | Salters | 73 | B | 0 | $75K |
| 8 | 29476 | Russellville | 66 | C | 0 | — |
Recommended Buyer Guides for Williamsburg County
If FEMA records flag flood-top-risk status or EPA samples show PFAS exceedances, the matching logic lifts emergency-water and PFAS-rated filtration into the recommendations - federal data drives the order, not retailer arrangements.
- Best Lead Paint Test Kits — 53.3% of homes built before 1978
Deep Dive Reports
Detailed analysis for Williamsburg County, South Carolina
Overview
Williamsburg County in South Carolina covers 8 ZIP codes with an average Home Safety Score of B (81/100).
3 of 8 ZIP codes have recorded EPA violations. 2 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.