What is the address of Derry Borough STP?

The address on the plant’s EPA facility record is Route 217 & Reed Rd, Derry, PA 15627, in Westmoreland County. Its coordinates are 40.3431, -79.2976. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Derry Borough STP treat?

Derry Borough STP is permitted for a design flow of 1.31 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Derry Borough STP use?

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

What is the NPDES permit for Derry Borough STP?

The facility discharges under NPDES permit PA0020788, currently expired, expiring May 2026.

Is Derry Borough STP in compliance?

Discharge monitoring reports show 16 violations at Derry Borough STP in the last three years, 16 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Derry Borough STP and how do I contact them?

Derry Borough STP is a publicly owned treatment works in Derry, Pennsylvania. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Derry Borough STP

Route 217 & Reed Rd, Derry, PA 15627 · Westmoreland County · Publicly Owned Treatment Works

Average flow: —

Design flow: 1.31 MGD

NPDES permit: PA0020788; Expired

Permit expires: May 2026

Population served: 3,057; CWNS 2022

Derry Borough STP is a publicly owned wastewater treatment works in Derry, Westmoreland County, Pennsylvania, serving about 3,057 residents. It discharges under NPDES permit PA0020788 (expired), which expires in May 2026, with 16 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Derry Borough STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 16

Effluent violations: 16

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

Key contacts

1 verified contact for Derry Borough STP, with validated emails and direct phone numbers.

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

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Derry Borough 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 November 28, 2025.

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

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