What is the address of Waitsburg STP?

The address on the plant’s EPA facility record is 16531 Wa-124, Waitsburg, WA 99361, in Walla Walla County. Its coordinates are 46.2725, -118.1726. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Waitsburg STP treat?

Waitsburg STP treats an average of 0.16 MGD.

What treatment technology does Waitsburg STP use?

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

What is the NPDES permit for Waitsburg STP?

The facility discharges under NPDES permit WA0045551, currently administratively continued, expiring June 2019.

Is Waitsburg STP in compliance?

Discharge monitoring reports show 7 violations at Waitsburg STP in the last three years, 5 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Waitsburg STP and how do I contact them?

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

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Waitsburg STP

16531 Wa-124, Waitsburg, WA 99361 · Walla Walla County · Publicly Owned Treatment Works

Average flow: 0.16 MGD

Design flow: —

NPDES permit: WA0045551; Administratively continued

Permit expires: June 2019

Population served: 1,385; CWNS 2022

Waitsburg STP is a publicly owned wastewater treatment works in Waitsburg, Walla Walla County, Washington treating an average of 0.16 million gallons per day, serving about 1,385 residents. It discharges under NPDES permit WA0045551 (administratively continued), which expires in June 2019, with 7 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Waitsburg STP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 7

Effluent violations: 5

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

Key contacts

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

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

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Nearby wastewater treatment plants in Washington

Dayton STP

Dayton · 9 mi away

0.25 MGD

Walla Walla Water Reclamation Facility

Walla Walla · 17 mi away

—

College Place WWTP

Walla Walla · 20 mi away

0.87 MGD

Pomeroy Sewage Treatment Plant

Pomeroy · 30 mi away

0.12 MGD

Pasco WWTP

Pasco · 44 mi away

—

Endicott STP

Endicott · 51 mi away

0.08 MGD

Richland City Wastewater Lab

Richland · 53 mi away

5.91 MGD

Asotin STP

Clarkston · 53 mi away

0.06 MGD

Waitsburg 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 August 3, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms

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