States › South Carolina › Dorchester County

Dorchester County, SC Water Quality

Water quality data for 5 public water systems serving Dorchester County, South Carolina — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 5 water systems · 5 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Dorchester County Earns a A

Dorchester County: 5 communities across 5 water systems. 100.0% have no open violations.

  • Median lead where detected: 0.95 ppb
  • 4 communities with a lead detection, 1 reporting none detected
  • 1 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 100.0% of communities have no open violations
0.95 ppb
Median Lead Level
County-wide, 90th percentile
5
Water Systems
Active CWS & NTNCWS
100%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Ridgeville
    0.83 ppb
    No federal limits exceeded on record
    B
  • St. George
    3.00 ppb
    No federal limits exceeded on record
    B
  • Harleyville
    Not detected
    No federal limits exceeded on record
    B
  • Reevesville
    1.00 ppb
    No federal limits exceeded on record
    B
  • Summerville
    0.90 ppb
    PFAS above the limit at 1 of 1 sampling points
    B
⚠ Needs Attention
  • Summerville
    0.90 ppb
    PFAS above the limit at 1 of 1 sampling points
    B
  • Ridgeville
    0.83 ppb
    No federal limits exceeded on record
    B
  • St. George
    3.00 ppb
    No federal limits exceeded on record
    B
  • Harleyville
    Not detected
    No federal limits exceeded on record
    B
  • Reevesville
    1.00 ppb
    No federal limits exceeded on record
    B
County Lead Level — Median 0.95 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 0.95 ppb — 6.3% of the federal action level
Systems by Lead Level
Under 5 ppb
4
No Data
1

All Cities in Dorchester County

Summerville 0.90 ppb B
Ridgeville 0.83 ppb B
St. George 3.00 ppb B
Harleyville Not detected B
Reevesville 1.00 ppb B
Showing 5 cities
No active violations Active violations

About Dorchester County Drinking Water

Dorchester County is served by 5 water systems covering 5 communities. No community here has an open violation on record.

Of the communities reporting lead results, 4 recorded a detection, with a median of 0.95 ppb — 6% of the federal action level. 1 reported none detected, which means below the laboratory limit rather than an absence of lead.

1 of 5 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Dorchester County tap water safe to drink?▼
No community in Dorchester County has an open violation on record. 1 of 5 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Dorchester County?▼
Among communities with a detection the median is 0.95 ppb, 6% of the 15 ppb action level. 1 reported none detected and 0 reported no result.
How many water systems serve Dorchester County?▼
5 community water systems serve 5 communities here.
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