What is the address of South Coastal STP?

The address on the plant’s EPA facility record is Beaver Dam Road, Frankford, DE 19945, in Sussex County. Its coordinates are 38.5223, -75.0892. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does South Coastal STP treat?

South Coastal STP treats an average of 4.37 MGD.

What treatment technology does South Coastal STP use?

Klarifi has identified 2 treatment structures and unit processes at the Frankford facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for South Coastal STP?

The facility discharges under NPDES permit DEL050008, currently effective, expiring December 2030.

Is South Coastal STP in compliance?

Discharge monitoring reports show 5 violations at South Coastal STP in the last three years, 5 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates South Coastal STP and how do I contact them?

South Coastal STP is a publicly owned treatment works in Frankford, Delaware. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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South Coastal STP

Beaver Dam Road, Frankford, DE 19945 · Sussex County · Publicly Owned Treatment Works

Average flow: 4.37 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 4.37 million gallons per day, serving about 21,810 residents. It discharges under NPDES permit DEL050008 (effective), which expires in December 2030, with 5 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at South Coastal STP.

Available with a free Klarifi account

See the full treatment train at South Coastal STP: structures, unit processes and planned upgrades, with exact unit counts.

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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.

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Names, validated emails and direct phone numbers for decision-makers at South Coastal STP, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Delaware

Selbyville Wastewater Treatment Facility

Selbyville · 8 mi away

1.24 MGD

Howard Seymour Water Reclamation Plant

Lewes · 18 mi away

1.29 MGD

Milton Wastewater Treatment Plant

Milton · 21 mi away

0.23 MGD

Laurel Water Department

Laurel · 27 mi away

0.5 MGD

Seaford Wastewater Treatment Plant

Seaford · 30 mi away

1.61 MGD

Port Penn Wastewater Treatment Plant

Port Penn · 73 mi away

0.04 MGD

Delaware City Wastewater Treatment Plant

Delaware City · 78 mi away

0.42 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 October 26, 2026; facility record last updated August 11, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms

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