What is the address of Ottawa WWTP?

The address on the plant’s EPA facility record is Pontiac Lane, Ottawa, IL 61350, in La Salle County. Its coordinates are 41.3392, -88.8500. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Ottawa WWTP treat?

Ottawa WWTP treats an average of 2.53 MGD.

What treatment technology does Ottawa WWTP use?

Klarifi has identified 3 treatment structures and unit processes at the Ottawa facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Ottawa WWTP?

The facility discharges under NPDES permit ILL030384, currently effective, expiring December 2030.

Is Ottawa WWTP in compliance?

Discharge monitoring reports show 89 violations at Ottawa WWTP in the last three years, 5 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Ottawa WWTP and how do I contact them?

Ottawa WWTP is a publicly owned treatment works in Ottawa, Illinois. Klarifi lists 13 verified decision-maker contacts for this facility, available with a free trial.

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Ottawa WWTP

Pontiac Lane, Ottawa, IL 61350 · La Salle County · Publicly Owned Treatment Works

Average flow: 2.53 MGD

Design flow: —

NPDES permit: ILL030384; Effective

Permit expires: December 2030

Population served: 18,201; CWNS 2022

Ottawa WWTP is a publicly owned wastewater treatment works in Ottawa, La Salle County, Illinois treating an average of 2.53 million gallons per day, serving about 18,201 residents. It discharges under NPDES permit ILL030384 (effective), which expires in December 2030, with 89 recorded violations in the last three years.

Treatment technology

3 treatment structures and unit processes identified at Ottawa WWTP.

Available with a free Klarifi account

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

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Compliance snapshot (last 3 years)

Total violations: 89

Effluent violations: 5

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

Key contacts

13 verified contacts for Ottawa WWTP, with validated emails and direct phone numbers.

Unlock 13 verified contacts (10 more than shown)

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

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North Utica Stp, Village Of

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Marseilles - South Stp, City Of

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—

Oglesby Stp, City Of

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Lasalle East Side Wwtp, City Of

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Tonica Stp, Village Of

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Streator STP

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Cedar Point - Stp, Village Of

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Ottawa 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 September 21, 2026; facility record last updated March 9, 2025.

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