Colchester Stp, City Of
600 South Fulton, Colchester, IL 62326 · Mcdonough County · Publicly Owned Treatment Works
- Average flow
- 0.12 MGD
- Design flow
- 0.47 MGD
- NPDES permit
- IL0028177
- Effective
- Permit expires
- January 2031
- Population served
- 1,755
- CWNS 2022
Colchester Stp, City Of is a publicly owned wastewater treatment works in Colchester, Mcdonough County, Illinois treating an average of 0.12 million gallons per day against a permitted design capacity of 0.47 MGD, serving about 1,755 residents. It discharges under NPDES permit IL0028177 (effective), which expires in January 2031, with 12 recorded violations in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in February 2018.
Treatment technology
2 treatment structures and unit processes identified at Colchester Stp, City Of.
Available with a free Klarifi account
See the full treatment train at Colchester Stp, City Of: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 12
- Effluent violations
- 4
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for Colchester Stp, City Of in EPA's ICIS system.
- Formal actions
- 1
- 0 since FY2020
- Compliance actions
- $4M
- required by EPA orders
- EPA inspections
- 0
- none on record
Latest case · Feb 2018
City Of Colchester STP
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $4M
EPA's description of the case:
“Effluent Permit violations”
Source: EPA ECHO, civil enforcement case 05-2012-0308.
Full case history with a free Klarifi account
Every action against Colchester Stp, City Of with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Key contacts
2 verified contacts for Colchester Stp, City Of, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Colchester Stp, City Of, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Tennessee · 3 mi away
0.003 MGD
Blandinsville · 9 mi away
0.03 MGD
Good Hope · 10 mi away
0.04 MGD
Industry · 11 mi away
0.05 MGD
Bardolph · 12 mi away
0.01 MGD
Plymouth · 12 mi away
0.1 MGD
Laharpe · 15 mi away
0.24 MGD
Bushnell · 16 mi away
0.33 MGD
Colchester 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 · FOG · Equalization tank · all terms