Mullan WWTP
191 Mill St, Mullan, ID 83846 · Shoshone County · Publicly Owned Treatment Works
- Average flow
- 0.14 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 0.14 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 33 recorded violations in the last three years.
Treatment technology
Treatment structures and unit processes at Mullan WWTP.
Treatment structure data not yet analyzed for this facility.
Compliance snapshot (last 3 years)
- Total violations
- 33
- 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 · 19 mi away
0.05 MGD
Smelterville · 19 mi away
2.04 MGD
Fernwood · 36 mi away
0.17 MGD
Saint Maries · 37 mi away
2.25 MGD
Saint Maries · 44 mi away
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Elk River · 50 mi away
0.06 MGD
Deary · 50 mi away
0.05 MGD
Hayden · 52 mi away
1.24 MGD
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 October 26, 2026; facility record last updated November 26, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Activated sludge · Oxidation ditch · all terms