How much wastewater does Mullan WWTP treat?

Mullan WWTP treats an average of 0.07 MGD and is permitted for a design flow of 0.55 MGD.

What is the NPDES permit for Mullan WWTP?

The facility discharges under NPDES permit ID0021296, currently administratively continued, expiring November 2025.

Is Mullan WWTP in compliance?

Discharge monitoring reports show 30 violations at Mullan WWTP in the last three years, 25 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Mullan WWTP and how do I contact them?

Mullan WWTP is a publicly owned treatment works in Mullan, Idaho. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Mullan WWTP

Mullan, ID · Shoshone County · Publicly Owned Treatment Works

Average flow: 0.07 MGD

Design flow: 0.55 MGD

NPDES permit: ID0021296; Administratively continued

Permit expires: November 2025

Population served: 814; CWNS 2022

Mullan WWTP is a publicly owned wastewater treatment works in Mullan, Shoshone County, Idaho treating an average of 0.07 million gallons per day against a permitted design capacity of 0.55 MGD, serving about 814 residents. It discharges under NPDES permit ID0021296 (administratively continued), which expires in November 2025, with 30 recorded violations in the last three years.

Treatment technology

Treatment structures identified at this facility. Exact unit counts are available in Klarifi.

Treatment structure data not yet analyzed for this facility.

Compliance snapshot (last 3 years)

Total violations: 30

Effluent violations: 25

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

Key contacts

Decision-makers at Mullan WWTP.

No verified contacts on file yet

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Nearby wastewater treatment plants in Idaho

Smelterville WWTP

Smelterville · 19 mi away

0.06 MGD

Page WWTP

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1.36 MGD

Santa Fernwood WWTF

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St Maries WWTP

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Emida Waste Water Facility

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Elk River STP

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Bovill Wastewater Treatment Facility

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Hayden Area Regional Sewer Board WWTP

Hayden · 52 mi away

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Mullan WWTP: 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 September 11, 2026; facility record last updated November 26, 2025.

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