Colleton County, South Carolina
8 ZIP codes · Avg score 78/100 · Grade B · Updated 2026-07-19
ZipCheckup grade for Colleton: B.
This ZIP looks solid, with a few items worth a quick check.
Across all 8 ZIP codes in Colleton County, tap water consistently meets or exceeds federal safety standards.
How Colleton County Compares
How Colleton County Compares
Colleton County scores 0 points above the South Carolina state average (78/100) and 10 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-07-19
ZIP Code Risk Map
Water Quality Map: Colleton 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: 15.8 (asthma 10.8%, diabetes 17.3%)
Estimated additional annual cost per homeowner: $2,938, driven primarily by sea_level
Infrastructure: 0.342% avg pipe failure probability, 13% of ZIPs at high risk
46.5% 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: $2,938
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
18,976 housing units in Colleton 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 Colleton County
Remediation costs are relatively manageable for most homeowners in Colleton 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 Colleton County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water systems serving Colleton County
7 community water systems serving Colleton County.
- A
- B
- A
- A
- B
- B
Show all 7 water systems
- A
Systems with the most violations in Colleton County
1 water system with recorded EPA violations.
- B
All ZIP Codes in Colleton County
8 ZIP codes tracked in Colleton County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29481 | Smoaks | 95 | A | 0 | $103K |
| 2 | 29488 | Walterboro | 90 | A | 0 | $156K |
| 3 | 29082 | Lodge | 89 | A | 0 | $109K |
| 4 | 29438 | Edisto Island | 78 | B | 4 | $556K |
| 5 | 29929 | Islandton | 73 | B | 0 | $89K |
| 6 | 29475 | Ruffin | 66 | C | 0 | $80K |
| 7 | 29435 | Cottageville | 65 | C | 0 | $162K |
| 8 | 29474 | Round O | 65 | C | 0 | $131K |
Recommended Buyer Guides for Colleton County
Federal and certification sources drive the ordering: EPA monitoring data, NSF certifications, FEMA flood maps, and CDC lead guidance - guides surface only when county data warrants them.
- Best Water Testing Kits — Baseline water quality check for your ZIP
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant peace of mind
Deep Dive Reports
Detailed analysis for Colleton County, South Carolina
Overview
Colleton County in South Carolina covers 8 ZIP codes with an average Home Safety Score of B (78/100).
1 of 8 ZIP codes have recorded EPA violations. All violations are monitoring/reporting type.
← 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.