What is the address of Othello STP?

The address on the plant’s EPA facility record is 2302 Cunningham Road, Othello, WA 99344, in Adams County. Its coordinates are 46.8254, -119.2254. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Othello STP treat?

Othello STP treats an average of 0.89 MGD and is permitted for a design flow of 10 MGD.

What treatment technology does Othello STP use?

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

What is the NPDES permit for Othello STP?

The facility discharges under NPDES permit WA0022357, currently administratively continued, expiring September 2025.

Is Othello STP in compliance?

Discharge monitoring reports show 86 violations at Othello STP in the last three years, 84 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Othello STP and how do I contact them?

Othello STP is a publicly owned treatment works in Othello, Washington. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Othello STP

2302 Cunningham Road, Othello, WA 99344 · Adams County · Publicly Owned Treatment Works

Average flow: 0.89 MGD

Design flow: 10 MGD

NPDES permit: WA0022357; Administratively continued

Permit expires: September 2025

Population served: 8,494; CWNS 2022

Othello STP is a publicly owned wastewater treatment works in Othello, Adams County, Washington treating an average of 0.89 million gallons per day against a permitted design capacity of 10 MGD, serving about 8,494 residents. It discharges under NPDES permit WA0022357 (administratively continued), which expires in September 2025, with 86 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Othello STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 86

Effluent violations: 84

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

Key contacts

1 verified contact for Othello STP, with validated emails and direct phone numbers.

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

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Nearby wastewater treatment plants in Washington

Vantage STP

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0.01 MGD

Richland City Wastewater Lab

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Benton City STP

Benton City · 40 mi away

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Pasco WWTP

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Odessa STP

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Crescent Bar Inc

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Prosser City WWTP

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Sunnyside STP

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Othello 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 26, 2026; facility record last updated October 8, 2026.

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

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