Tilden STP
Tilden, IL · Randolph County · Publicly Owned Treatment Works
- Average flow
- 0.009 MGD
- Design flow
- 0.28 MGD
- NPDES permit
- ILG580107
- Effective
- Permit expires
- May 2027
- Population served
- 1,028
- CWNS 2022
Tilden STP is a publicly owned wastewater treatment works in Tilden, Randolph County, Illinois treating an average of 0.009 million gallons per day against a permitted design capacity of 0.28 MGD, serving about 1,028 residents. Treatment on site includes uncovered lagoons. It discharges under NPDES permit ILG580107 (effective), which expires in May 2027, with 16 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Uncovered lagoons
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Compliance snapshot (last 3 years)
- Total violations
- 16
- Effluent violations
- 16
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
1 verified contact for Tilden STP, with validated emails and direct phone numbers.
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Names, validated emails and direct phone numbers for decision-makers at Tilden STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Coulterville · 4 mi away
0.02 MGD
Marissa · 5 mi away
0.31 MGD
Sparta · 6 mi away
0.41 MGD
Baldwin · 8 mi away
0.05 MGD
Lenzburg · 9 mi away
0.02 MGD
Saint Libory · 11 mi away
0.03 MGD
Percy · 13 mi away
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Fayetteville · 13 mi away
0.01 MGD
Tilden 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 September 11, 2026; facility record last updated March 7, 2025.