What is the address of Marion SE Stp, City Of?

The address on the plant’s EPA facility record is 1321 South Van Buren Street, Marion, IL 62959, in Williamson County. Its coordinates are 37.7194, -88.9291. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Marion SE Stp, City Of treat?

Marion SE Stp, City Of treats an average of 2.63 MGD.

What treatment technology does Marion SE Stp, City Of use?

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

What is the NPDES permit for Marion SE Stp, City Of?

The facility discharges under NPDES permit ILL029734, currently effective, expiring December 2030.

Is Marion SE Stp, City Of in compliance?

Discharge monitoring reports show 1 violation at Marion SE Stp, City Of in the last three years, 1 of them effluent limit exceedances. The full history is available in Klarifi.

Who operates Marion SE Stp, City Of and how do I contact them?

Marion SE Stp, City Of is a publicly owned treatment works in Marion, Illinois. Klarifi lists 6 verified decision-maker contacts for this facility, available with a free trial.

Try for free Log in

Marion SE Stp, City Of

1321 South Van Buren Street, Marion, IL 62959 · Williamson County · Publicly Owned Treatment Works

Average flow: 2.63 MGD

Design flow: —

NPDES permit: ILL029734; Effective

Permit expires: December 2030

Population served: 17,620; CWNS 2022

Marion SE Stp, City Of is a publicly owned wastewater treatment works in Marion, Williamson County, Illinois treating an average of 2.63 million gallons per day, serving about 17,620 residents. It discharges under NPDES permit ILL029734 (effective), which expires in December 2030, with 1 recorded violation in the last three years.

Treatment technology

One treatment structure or unit process identified at Marion SE Stp, City Of.

Available with a free Klarifi account

See the full treatment train at Marion SE Stp, City Of: structures, unit processes and planned upgrades, with exact unit counts.

Create a free account

Compliance snapshot (last 3 years)

Total violations: 1

Effluent violations: 1

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

Key contacts

6 verified contacts for Marion SE Stp, City Of, with validated emails and direct phone numbers.

Unlock 6 verified contacts (3 more than shown)

Names, validated emails and direct phone numbers for decision-makers at Marion SE Stp, City Of, plus the full compliance history and discharge data.

Try Klarifi free

Nearby wastewater treatment plants in Illinois

Johnston City STP

Johnston City · 6 mi away

0.47 MGD

Pittsburg, Village Of

Pittsburg · 7 mi away

0.03 MGD

Energy Stp, Village Of

Energy · 7 mi away

0.09 MGD

Crainville Stp, Village Of

Carterville · 8 mi away

0.2 MGD

Carterville Stp, City Of

Carterville · 9 mi away

0.49 MGD

Herrin Stp, City Of

Herrin · 9 mi away

1.36 MGD

Colp Stp, Village Of

Colp · 10 mi away

0.01 MGD

Goreville Stp, Village Of

Goreville · 11 mi away

0.05 MGD

Marion SE Stp, City Of: 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 1, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms

Try Klarifi for free

Create your own trial account and explore how Klarifi can help you.

Try for free