What is the address of Washington STP #2?

The address on the plant’s EPA facility record is 955 Ernest Street, Washington, IL 61571, in Tazewell County. Its coordinates are 40.6842, -89.4613. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Washington STP #2 treat?

Washington STP #2 treats an average of 1.88 MGD and is permitted for a design flow of 6.37 MGD.

What treatment technology does Washington STP #2 use?

Klarifi has identified 2 treatment structures and unit processes at the Washington facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Washington STP #2?

The facility discharges under NPDES permit IL0042412, currently effective, expiring October 2030.

Is Washington STP #2 in compliance?

Discharge monitoring reports show no violations at Washington STP #2 in the last three years.

Who operates Washington STP #2 and how do I contact them?

Washington STP #2 is a publicly owned treatment works in Washington, Illinois. Klarifi lists 1 verified decision-maker contact for this facility, available with a free trial.

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Washington STP #2

955 Ernest Street, Washington, IL 61571 · Tazewell County · Publicly Owned Treatment Works

Average flow: 1.88 MGD

Design flow: 6.37 MGD

NPDES permit: IL0042412; Effective

Permit expires: October 2030

Population served: 13,268; CWNS 2022

Washington STP #2 is a publicly owned wastewater treatment works in Washington, Tazewell County, Illinois treating an average of 1.88 million gallons per day against a permitted design capacity of 6.37 MGD, serving about 13,268 residents. It discharges under NPDES permit IL0042412 (effective), which expires in October 2030, with 0 recorded violations in the last three years.

Treatment technology

2 treatment structures and unit processes identified at Washington STP #2.

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See the full treatment train at Washington STP #2: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 0

Effluent violations: 0

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

Key contacts

1 verified contact for Washington STP #2, with validated emails and direct phone numbers.

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Names, validated emails and direct phone numbers for decision-makers at Washington STP #2, plus the full compliance history and discharge data.

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Nearby wastewater treatment plants in Illinois

Morton STP 3

Morton · 3 mi away

0.76 MGD

East Peoria #3 STP

East Peoria · 4 mi away

0.5 MGD

Germantown Hills Stp, Village Of

Metamora · 5 mi away

0.11 MGD

Deer Creek Stp, Village Of

Deer Creek · 7 mi away

0.14 MGD

City Of East Peoria Wastwater Treatment Plant

East Peoria · 8 mi away

3.53 MGD

Morton STP 2

Morton · 8 mi away

2.7 MGD

Oak Ridge Sd STP

Metamora · 8 mi away

0.01 MGD

Greater Peoria Sanitary And Sewage District

Peoria · 9 mi away

19.22 MGD

Washington STP #2: 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 September 16, 2026.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms

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