Plum Island WWTP
Charleston, SC · Charleston County · Publicly Owned Treatment Works
- Average flow
- 27 MGD
- Design flow
- 36 MGD
- NPDES permit
- SC0021229
- Administratively continued
- Permit expires
- July 2024
- Population served
- 232,756
- CWNS 2022
Plum Island WWTP is a publicly owned wastewater treatment works in Charleston, Charleston County, South Carolina treating an average of 27 million gallons per day against a permitted design capacity of 36 MGD, serving about 232,756 residents. Treatment on site includes clarifiers, biogas balloons. It discharges under NPDES permit SC0021229 (administratively continued), which expires in July 2024, with 3 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 3
- Effluent violations
- 3
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Plum Island WWTP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Plum Island WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in South Carolina
North Charleston · 5 mi away
15.89 MGD
Charleston · 6 mi away
—
Sullivans Island · 6 mi away
0.38 MGD
Mount Pleasant · 8 mi away
7.3 MGD
Isle Of Palms · 10 mi away
0.01 MGD
Goose Creek · 14 mi away
8.6 MGD
Dorchester · 14 mi away
6.7 MGD
Summerville · 22 mi away
4.8 MGD
Plum Island WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 3, 2026.