Aqua Illinois - Grant Park STP
South Main Street, Grant Park, IL 60940 · Kankakee County · Publicly Owned Treatment Works
- Average flow
- 0.35 MGD
- Design flow
- 0.94 MGD
- NPDES permit
- IL0050717
- Effective
- Permit expires
- October 2026
- Population served
- —
- CWNS 2022
Aqua Illinois - Grant Park STP is a publicly owned wastewater treatment works in Grant Park, Kankakee County, Illinois treating an average of 0.35 million gallons per day against a permitted design capacity of 0.94 MGD. It discharges under NPDES permit IL0050717 (effective), which expires in October 2026, with 6 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Aqua Illinois - Grant Park STP.
Available with a free Klarifi account
See the full treatment train at Aqua Illinois - Grant Park STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 6
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Aqua Illinois - Grant Park STP.
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Nearby wastewater treatment plants in Illinois
Beecher · 8 mi away
0.84 MGD
Saint Anne · 8 mi away
0.1 MGD
Peotone · 10 mi away
0.85 MGD
Manteno · 10 mi away
1.43 MGD
Hopkins Park · 12 mi away
0.009 MGD
Saint Anne · 15 mi away
0.21 MGD
Park Forest · 18 mi away
—
Frankfort · 23 mi away
4.97 MGD
Aqua Illinois - Grant Park 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 December 16, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Equalization tank · Centrate · all terms