Charleston County, South Carolina
41 ZIP codes · Avg score 84/100 · Grade B · Updated 2026-06-04
Within Charleston County's 41 tracked ZIP codes, safety indicators remain above the national average with few health-based violations on record.
How Charleston County Compares
How Charleston County Compares
Charleston 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: Charleston 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: 11.7 (asthma 8.9%, diabetes 11.8%)
Estimated additional annual cost per homeowner: $3,433, driven primarily by sea_level
Infrastructure: 0.301% avg pipe failure probability, 12% of ZIPs at high risk
51.4% of homes built before 1978 (lead paint era)
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Charleston County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 10 violations. Past 5 years: 14 total (14 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: $3,433
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
210,316 housing units in Charleston 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 Charleston County
Remediation costs are relatively manageable for most homeowners in Charleston 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 Charleston 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 Charleston County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Burbage Mhp (sc1060063) | 171 | 25 |
| 2 | Mt Pleasant Water Works (1010002) | 91,500 | 21 |
| 3 | Cresthaven Mhp (sc4060001) | 37 | 18 |
| 4 | Charleston Water System (sc1010001) | 327,422 | 12 |
| 5 | Dcwa Knightsville (1820001) | 40,141 | 7 |
26 total water systems serve Charleston County.
All ZIP Codes in Charleston County
41 ZIP codes tracked in Charleston County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 29409 | Charleston | 99 | A | 0 | — |
| 2 | 29413 | Charleston | 99 | A | 0 | — |
| 3 | 29416 | Charleston | 99 | A | 0 | — |
| 4 | 29423 | Charleston | 99 | A | 0 | — |
| 5 | 29424 | Charleston | 99 | A | 0 | — |
| 6 | 29457 | Johns Island | 98 | A | 3 | — |
| 7 | 29415 | North Charleston | 97 | A | 1 | — |
| 8 | 29419 | North Charleston | 97 | A | 1 | — |
| 9 | 29417 | Charleston | 95 | A | 0 | — |
| 10 | 29422 | Charleston | 95 | A | 0 | — |
| 11 | 29425 | Charleston | 95 | A | 0 | — |
| 12 | 29812 | Barnwell | 95 | A | 0 | $105K |
| 13 | 29436 | Cross | 94 | A | 3 (1 health) | $107K |
| 14 | 29465 | Mount Pleasant | 94 | A | 6 (1 health) | — |
| 15 | 29493 | Williams | 91 | A | 1 (1 health) | $90K |
| 16 | 29222 | Columbia | 90 | A | 5 (2 health) | — |
| 17 | 29402 | Charleston | 90 | A | 0 | — |
| 18 | 29426 | Adams Run | 90 | A | 0 | $211K |
| 19 | 29470 | Ravenel | 88 | A | 7 (2 health) | $244K |
| 20 | 29406 | Charleston | 85 | A | 0 | $210K |
| 21 | 29429 | Awendaw | 84 | B | 3 (1 health) | $479K |
| 22 | 29403 | Charleston | 80 | B | 0 | $624K |
| 23 | 29482 | Sullivans Island | 80 | B | 0 | $2000K |
| 24 | 29466 | Mount Pleasant | 79 | B | 6 (1 health) | $659K |
| 25 | 29405 | North Charleston | 78 | B | 1 | $266K |
| 26 | 29418 | North Charleston | 78 | B | 1 | $235K |
| 27 | 29401 | Charleston | 75 | B | 0 | $1166K |
| 28 | 29407 | Charleston | 75 | B | 0 | $407K |
| 29 | 29412 | Charleston | 75 | B | 0 | $458K |
| 30 | 29414 | Charleston | 75 | B | 0 | $381K |
| 31 | 29439 | Folly Beach | 75 | B | 0 | $1004K |
| 32 | 29451 | Isle Of Palms | 75 | B | 0 | $1198K |
| 33 | 29455 | Johns Island | 74 | B | 3 | $500K |
| 34 | 29464 | Mount Pleasant | 74 | B | 6 (1 health) | $672K |
| 35 | 29446 | Green Pond | 73 | B | 0 | $60K |
| 36 | 29452 | Jacksonboro | 73 | B | 0 | $89K |
| 37 | 29914 | Dale | 73 | B | 0 | — |
| 38 | 29450 | Huger | 65 | C | 0 | $171K |
| 39 | 29487 | Wadmalaw Island | 65 | C | 0 | $442K |
| 40 | 29449 | Hollywood | 60 | C | 0 | $405K |
| 41 | 29410 | Hanahan | 55 | C | 0 | $340K |
Recommended Buyer Guides for Charleston County
While many sites publish identical guide lists across every county they cover, the selection here changes by location — driven by the EPA, NSF, FEMA, and CDC datasets that describe the actual conditions documented for this jurisdiction in the federal record.
- Best Lead Paint Test Kits — 51.4% of homes built before 1978
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
Deep Dive Reports
Detailed analysis for Charleston County, South Carolina
Overview
Charleston County in South Carolina covers 41 ZIP codes with an average Home Safety Score of B (84/100).
14 of 41 ZIP codes have recorded EPA violations. 10 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.