South Coastal STP
Frankford, DE · Sussex County · Publicly Owned Treatment Works
- Average flow
- 4.6 MGD
- Design flow
- —
- NPDES permit
- DEL050008
- Effective
- Permit expires
- December 2030
- Population served
- 21,810
- CWNS 2022
South Coastal STP is a publicly owned wastewater treatment works in Frankford, Sussex County, Delaware treating an average of 4.6 million gallons per day, serving about 21,810 residents. Treatment on site includes clarifiers, aerated lagoons. It discharges under NPDES permit DEL050008 (effective), which expires in December 2030, with 5 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
- 5
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for South Coastal STP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at South Coastal STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Delaware
Selbyville · 8 mi away
1.26 MGD
Lewes · 18 mi away
1.05 MGD
Milton · 21 mi away
0.23 MGD
Laurel · 27 mi away
0.34 MGD
Seaford · 30 mi away
1.57 MGD
Port Penn · 73 mi away
0.03 MGD
Delaware City · 78 mi away
0.37 MGD
Wilmington · 87 mi away
78.67 MGD
South Coastal STP: 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 11, 2026.