Marion County, South Carolina
8 ZIP codes · Avg score 73/100 · Grade B · Updated 2026-06-04
Spanning 8 ZIP codes, Marion County posts strong drinking water compliance — most systems have never triggered a health-based notice.
How Marion County Compares
How Marion County Compares
Marion County scores 5 points below the South Carolina state average (78/100) and 5 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-04
ZIP Code Risk Map
Water Quality Map: Marion 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 11.1%, diabetes 20.7%)
Estimated additional annual cost per homeowner: $4,678, driven primarily by sea_level
Infrastructure: 0.321% avg pipe failure probability, 13% of ZIPs at high risk
54.3% 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: $4,678
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
17,862 housing units in Marion 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 Marion County
Water safety remediation is a moderate expense relative to home values. Most homeowners can address issues through staged improvements over time.
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 Marion 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 Marion County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | MARCO RURAL WATER CO (SC3320001) | 17,120 | 0 |
| 2 | GSW&SA (SC2620004) | 247,550 | 0 |
| 3 | MULLINS CITY OF (SC3310002) | 7,366 | 0 |
| 4 | GSW&SA-NICHOLS TOWN OF (SC3310003) | 678 | 0 |
| 5 | Gsw&sa-marion City of (sc3310001) | 9,104 | 0 |
All ZIP Codes in Marion County
8 ZIP codes tracked in Marion County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29571 | Marion | 85 | A | 0 | $99K |
| 2 | 29581 | Nichols | 85 | A | 0 | $98K |
| 3 | 29574 | Mullins | 80 | B | 0 | $78K |
| 4 | 29543 | Fork | 73 | B | 0 | $74K |
| 5 | 29519 | Centenary | 66 | C | 0 | $182K |
| 6 | 29589 | Rains | 66 | C | 0 | — |
| 7 | 29544 | Galivants Ferry | 65 | C | 0 | $192K |
| 8 | 29563 | Lake View | 65 | C | 0 | $101K |
Recommended Buyer Guides for Marion County
Methodologically, the recommendation order reflects severity in the federal record: contaminants flagged in EPA detection records for this county outrank generic water concerns, FEMA-confirmed hazard ratings shift emergency-related categories upward, and CDC lead-exposure markers govern when lead-test kits and certified filters appear at the top of the list.
- Best Lead Paint Test Kits — 54.3% of homes built before 1978
Deep Dive Reports
Detailed analysis for Marion County, South Carolina
Overview
Marion County in South Carolina covers 8 ZIP codes with an average Home Safety Score of B (73/100).
No EPA violations recorded across any tracked ZIP codes in Marion County.
← 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.