Lanark Stp, City Of
108 W Carroll, Lanark, IL 61046 · Carroll County · Publicly Owned Treatment Works
- Average flow
- 0.35 MGD
- Design flow
- 1.15 MGD
- NPDES permit
- ILG582023
- Effective
- Permit expires
- May 2027
- Population served
- 1,577
- CWNS 2022
Lanark Stp, City Of is a publicly owned wastewater treatment works in Lanark, Carroll County, Illinois treating an average of 0.35 million gallons per day against a permitted design capacity of 1.15 MGD, serving about 1,577 residents. It discharges under NPDES permit ILG582023 (effective), which expires in May 2027, with 38 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Lanark Stp, City Of.
Available with a free Klarifi account
See the full treatment train at Lanark Stp, City Of: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 38
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Lanark Stp, City Of.
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Nearby wastewater treatment plants in Illinois
Chadwick · 7 mi away
0.08 MGD
Shannon · 7 mi away
0.12 MGD
Mt. Carroll · 7 mi away
0.14 MGD
Milledgeville · 10 mi away
0.15 MGD
Forreston · 14 mi away
0.15 MGD
Thomson · 17 mi away
0.21 MGD
Lena · 19 mi away
0.29 MGD
German Valley · 20 mi away
0.02 MGD
Lanark 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 November 7, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Filter press · FOG · all terms