Florence County, South Carolina
10 ZIP codes · Avg score 84/100 · Grade B · Updated 2026-06-04
Throughout Florence County, the 10 monitored ZIP codes show low violation rates and healthy safety scores — a pattern that puts the county well above the state baseline for drinking water quality.
How Florence County Compares
How Florence County Compares
Florence County scores 6 points above the South Carolina state average (78/100) and 16 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Florence 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: 14.9 (asthma 10.4%, diabetes 16.1%)
Estimated additional annual cost per homeowner: $4,575, driven primarily by sea_level
Infrastructure: 0.282% avg pipe failure probability
53.1% of homes built before 1978 (lead paint era)
Violation History (2021–2022)
→ Stable trendEPA violation counts by year across Florence County water systems. Health-based shown in red, total in blue.
Peak year: 2021 with 2 violations. Past 5 years: 3 total (3 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: $4,575
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
52,315 housing units in Florence 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 Florence County
Remediation costs are relatively manageable for most homeowners in Florence 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 Florence 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 Florence County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | JOHNSONVILLE CITY OF (SC2110011) | 5,083 | 2 |
| 2 | Hemingway Town of (sc4510004) | 3,191 | 2 |
| 3 | Olanta Town of (sc2110006) | 801 | 0 |
| 4 | Florence City of (sc2110001) | 79,745 | 0 |
| 5 | Darlington County W&sa (sc1620001) | 52,288 | 0 |
9 total water systems serve Florence County.
All ZIP Codes in Florence County
10 ZIP codes tracked in Florence County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29503 | Florence | 99 | A | 0 | — |
| 2 | 29114 | Olanta | 95 | A | 0 | $102K |
| 3 | 29530 | Coward | 90 | A | 0 | $116K |
| 4 | 29591 | Scranton | 90 | A | 0 | $59K |
| 5 | 29555 | Johnsonville | 87 | A | 2 | $119K |
| 6 | 29501 | Florence | 85 | A | 0 | $221K |
| 7 | 29505 | Florence | 85 | A | 0 | $174K |
| 8 | 29506 | Florence | 85 | A | 0 | $114K |
| 9 | 29541 | Effingham | 65 | C | 0 | $156K |
| 10 | 29546 | Gresham | 60 | C | 0 | $97K |
Recommended Buyer Guides for Florence County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Lead Paint Test Kits — 53.1% of homes built before 1978
Deep Dive Reports
Detailed analysis for Florence County, South Carolina
Overview
Florence County in South Carolina covers 10 ZIP codes with an average Home Safety Score of B (84/100).
1 of 10 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.