What is the address of Whitemarsh STP?

The address on the plant’s EPA facility record is 2015 Joshua Road, Lafayette Hill, PA 19444, in Montgomery County. Its coordinates are 40.0812, -75.2808. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Whitemarsh STP treat?

Whitemarsh STP treats an average of 0.88 MGD and is permitted for a design flow of 2 MGD.

What treatment technology does Whitemarsh STP use?

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

What is the NPDES permit for Whitemarsh STP?

The facility discharges under NPDES permit PA0026298, currently effective, expiring January 2029.

Is Whitemarsh STP in compliance?

Discharge monitoring reports show 18 violations at Whitemarsh STP in the last three years, 15 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Whitemarsh STP and how do I contact them?

Whitemarsh STP is a publicly owned treatment works in Lafayette Hill, Pennsylvania. Klarifi lists 2 verified decision-maker contacts for this facility, available with a free trial.

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Whitemarsh STP

2015 Joshua Road, Lafayette Hill, PA 19444 · Montgomery County · Publicly Owned Treatment Works

Average flow: 0.88 MGD

Design flow: 2 MGD

NPDES permit: PA0026298; Effective

Permit expires: January 2029

Population served: 15,329; CWNS 2022

Whitemarsh STP is a publicly owned wastewater treatment works in Lafayette Hill, Montgomery County, Pennsylvania treating an average of 0.88 million gallons per day against a permitted design capacity of 2 MGD, serving about 15,329 residents. It discharges under NPDES permit PA0026298 (effective), which expires in January 2029, with 18 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Whitemarsh STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 18

Effluent violations: 15

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

Key contacts

2 verified contacts for Whitemarsh STP, with validated emails and direct phone numbers.

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

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Nearby wastewater treatment plants in Pennsylvania

Conshohocken Boro Auth

Conshohocken · 1 mi away

1.07 MGD

Matsunk STP

King Of Prussia · 3 mi away

2.45 MGD

Bridgeport Boro STP

Bridgeport · 3 mi away

0.39 MGD

E Norriton Plymouth /norristown

Plymouth Meeting · 3 mi away

4.25 MGD

Norristown Muni STP

Norristown · 3 mi away

4.87 MGD

Ambler Boro Ms4 Ua

Ambler · 6 mi away

3.39 MGD

Upper Dublin WWTP

Fort Washington · 6 mi away

0.74 MGD

Upper Merion Twp. Auth-Trout R

King Of Prussia · 7 mi away

2.39 MGD

Whitemarsh 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 May 24, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · WWTP · Biosolids · all terms

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