What is the address of Harleysville STP?

The address on the plant’s EPA facility record is 650 Main St, Harleysville, PA 19438, in Montgomery County. Its coordinates are 40.2850, -75.3961. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Harleysville STP treat?

Harleysville STP treats an average of 0.37 MGD and is permitted for a design flow of 0.59 MGD.

What treatment technology does Harleysville STP use?

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

What is the NPDES permit for Harleysville STP?

The facility discharges under NPDES permit PA0024422, currently expired, expiring September 2006.

Is Harleysville STP in compliance?

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

Who operates Harleysville STP and how do I contact them?

Harleysville STP is a publicly owned treatment works in Harleysville, Pennsylvania. Klarifi lists 3 verified decision-maker contacts for this facility, available with a free trial.

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Harleysville STP

650 Main St, Harleysville, PA 19438 · Montgomery County · Publicly Owned Treatment Works

Average flow: 0.37 MGD

Design flow: 0.59 MGD

NPDES permit: PA0024422; Expired

Permit expires: September 2006

Population served: —; CWNS 2022

Harleysville STP is a publicly owned wastewater treatment works in Harleysville, Montgomery County, Pennsylvania treating an average of 0.37 million gallons per day against a permitted design capacity of 0.59 MGD. It discharges under NPDES permit PA0024422 (expired), which expires in September 2006, with 1 recorded violation in the last three years.

Treatment technology

One treatment structure or unit process identified at Harleysville STP.

Available with a free Klarifi account

See the full treatment train at Harleysville 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

3 verified contacts for Harleysville STP, with validated emails and direct phone numbers.

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

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Nearby wastewater treatment plants in Pennsylvania

Mainland STP

Harleysville · 3 mi away

0.6 MGD

Lower Frederick Twp STP

Zieglersville · 3 mi away

0.14 MGD

Souderton Boro STP

Souderton · 3 mi away

1.3 MGD

Telford Boro Auth WWTP

Telford · 4 mi away

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Schwenksville Boro WWTP

Schwenksville · 4 mi away

0.14 MGD

Upper Gwynedd-Towamencin Mun A

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Perkiomen Crossing STP

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Green Lane Marlboro Jt Auth

Green Lane · 6 mi away

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Harleysville 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 25, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms

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