How much wastewater does Joseph STP treat?

Joseph STP treats an average of 0.12 MGD and is permitted for a design flow of 0.77 MGD.

What treatment technology does Joseph STP use?

Klarifi has identified aerated lagoons, uncovered lagoons at the Joseph facility.

What is the NPDES permit for Joseph STP?

The facility discharges under NPDES permit OR0020605, currently effective, expiring December 2029.

Is Joseph STP in compliance?

Discharge monitoring reports show 2 violations at Joseph STP in the last three years, 2 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Joseph STP and how do I contact them?

Joseph STP is a publicly owned treatment works in Joseph, Oregon. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Joseph STP

Joseph, OR · Wallowa County · Publicly Owned Treatment Works

Average flow: 0.12 MGD

Design flow: 0.77 MGD

NPDES permit: OR0020605; Effective

Permit expires: December 2029

Population served: 1,756; CWNS 2022

Joseph STP is a publicly owned wastewater treatment works in Joseph, Wallowa County, Oregon treating an average of 0.12 million gallons per day against a permitted design capacity of 0.77 MGD, serving about 1,756 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit OR0020605 (effective), which expires in December 2029, with 2 recorded violations in the last three years.

Treatment technology

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

Aerated lagoons

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Uncovered lagoons

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Compliance snapshot (last 3 years)

Total violations: 2

Effluent violations: 2

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

Key contacts

Decision-makers at Joseph STP.

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Nearby wastewater treatment plants in Oregon

Enterprise STP

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0.24 MGD

Wallowa STP

Wallowa · 21 mi away

0.1 MGD

Union WWTP

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0.12 MGD

Elgin STP

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North Powder STP

North Powder · 41 mi away

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Athena STP

Athena · 69 mi away

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Huntington STP

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0.04 MGD

Ontario STP

Ontario · 93 mi away

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Joseph 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 September 11, 2026; facility record last updated November 7, 2025.

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