What is the address of Benson STP?

The address on the plant’s EPA facility record is PO Box 118, Hollsopple, PA 15935, in Somerset County. Its coordinates are 40.2077, -78.9179. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Benson STP treat?

Benson STP treats an average of 0.1 MGD and is permitted for a design flow of 0.16 MGD.

What treatment technology does Benson STP use?

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

What is the NPDES permit for Benson STP?

The facility discharges under NPDES permit PA0098973, currently expired, expiring June 2026.

Is Benson STP in compliance?

Discharge monitoring reports show 20 violations at Benson STP in the last three years, 18 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Benson STP and how do I contact them?

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

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Benson STP

PO Box 118, Hollsopple, PA 15935 · Somerset County · Publicly Owned Treatment Works

Average flow: 0.1 MGD

Design flow: 0.16 MGD

NPDES permit: PA0098973; Expired

Permit expires: June 2026

Population served: —; CWNS 2022

Benson STP is a publicly owned wastewater treatment works in Hollsopple, Somerset County, Pennsylvania treating an average of 0.1 million gallons per day against a permitted design capacity of 0.16 MGD. It discharges under NPDES permit PA0098973 (expired), which expires in June 2026, with 20 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Benson STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 20

Effluent violations: 18

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

Key contacts

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

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

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Nearby wastewater treatment plants in Pennsylvania

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Upper Stonycreek Jma

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Ingleside STP

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Tire Hill WWTP

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Jenner Area Jt Sew Auth Boswell Plt

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Village Of 42 STP

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Shade Ctl City Jt Auth STP

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Johnstown Wastewater Treatment Plant

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Benson 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 August 18, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Tertiary treatment · Significant industrial user · all terms

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