What is the address of Greencastle STP?

The address on the plant’s EPA facility record is Grant Shook Road, Greencastle, PA 17225, in Franklin County. Its coordinates are 39.7892, -77.7440. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Greencastle STP treat?

Greencastle STP treats an average of 0.3 MGD and is permitted for a design flow of 0.95 MGD.

What treatment technology does Greencastle STP use?

Klarifi has identified one treatment structure or unit process at the Greencastle facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Greencastle STP?

The facility discharges under NPDES permit PA0020834, currently effective, expiring July 2031.

Is Greencastle STP in compliance?

Discharge monitoring reports show 1 violation at Greencastle STP in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Greencastle STP and how do I contact them?

Greencastle STP is a publicly owned treatment works in Greencastle, Pennsylvania. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Greencastle STP

Grant Shook Road, Greencastle, PA 17225 · Franklin County · Publicly Owned Treatment Works

Average flow: 0.3 MGD

Design flow: 0.95 MGD

NPDES permit: PA0020834; Effective

Permit expires: July 2031

Population served: —; CWNS 2022

Greencastle STP is a publicly owned wastewater treatment works in Greencastle, Franklin County, Pennsylvania treating an average of 0.3 million gallons per day against a permitted design capacity of 0.95 MGD. It discharges under NPDES permit PA0020834 (effective), which expires in July 2031, with 1 recorded violation in the last three years.

Treatment technology

One treatment structure or unit process identified at Greencastle STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

Decision-makers at Greencastle STP.

No verified contacts on file yet

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Nearby wastewater treatment plants in Pennsylvania

Peters Twp Upton STP

Greencastle · 4 mi away

0.01 MGD

Antrim Twp Mun Auth STP

Greencastle · 4 mi away

0.63 MGD

St Thomas Twp STP

Chambersburg · 8 mi away

0.2 MGD

Peters Twp Junction STP

Mercersburg · 9 mi away

0.04 MGD

Quincy Twp STP

Waynesboro · 9 mi away

0.16 MGD

Mercersburg STP

Mercersburg · 9 mi away

0.12 MGD

Mont Alto STP

Mont Alto · 10 mi away

0.08 MGD

Chambersburg Boro STP

Chambersburg · 10 mi away

5.44 MGD

Greencastle 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 12, 2026; facility record last updated September 30, 2026.

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

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