North Slope Treatment Plant
007 1st Avenue, Moline, IL 61265 · Rock Island County · Publicly Owned Treatment Works
- Average flow
- 4.25 MGD
- Design flow
- —
- NPDES permit
- ILL029947
- Effective
- Permit expires
- December 2030
- Population served
- 15,605
- CWNS 2022
North Slope Treatment Plant is a publicly owned wastewater treatment works in Moline, Rock Island County, Illinois treating an average of 4.25 million gallons per day, serving about 15,605 residents. It discharges under NPDES permit ILL029947 (effective), which expires in December 2030, with 1 recorded violation in the last three years. EPA has recorded 1 formal enforcement action naming the plant, the latest in September 2026.
Treatment technology
One treatment structure or unit process identified at North Slope Treatment Plant.
Available with a free Klarifi account
See the full treatment train at North Slope Treatment Plant: structures, unit processes and planned upgrades, with exact unit counts.
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.
EPA enforcement history
Federal civil enforcement cases, compliance inspections and informal actions recorded for North Slope Treatment Plant in EPA's ICIS system.
- Formal actions
- 1
- 1 since FY2020
- Compliance actions
- $15,000
- required by EPA orders
- EPA inspections
- 1
- none on record
Latest case · Sep 2026
Moline_AOC
Administrative order · CWA, NPDES Permit Violations · Final Order No Penalty · Compliance actions $15,000 · The case also names 1 other plant, and its amounts cover all of them
Source: EPA ECHO, civil enforcement case 05-2024-0318.
Full case history with a free Klarifi account
Every action against North Slope Treatment Plant with dates, milestones, violation types and EPA's complete case summaries, plus inspections and informal actions.
Capital improvement projects in Moline
Moline's capital improvement plan lists 59 water, sewer and wastewater line items worth $82M starting 2025–2027. The largest budgeted items are shown here.
All water and sewer capital projects in Moline →
| Project | Budget | Years |
|---|---|---|
| South Slope Construction (and Engineering) | $56,000,000 | 2025–2027 |
| Lead Service Replacements | $9,000,000 | 2025–2027 |
| Water Treatment Plant Improvement Planning Study Recommendation | $2,250,000 | 2025–2027 |
| Per- and Polyfluoroalkyl Substances Powdered Activated Carbon Installation | $2,100,000 | 2026–2026 |
| Sewer Lining | $1,400,000 | 2025–2027 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
5 verified contacts for North Slope Treatment Plant, with validated emails and direct phone numbers.
Unlock 5 verified contacts (2 more than shown)
Names, validated emails and direct phone numbers for decision-makers at North Slope Treatment Plant, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Illinois
Moline · 4 mi away
3.64 MGD
Milan · 5 mi away
0.77 MGD
East Moline · 6 mi away
4.16 MGD
Milan · 7 mi away
0.05 MGD
Colona · 10 mi away
0.3 MGD
Orion · 13 mi away
0.46 MGD
Reynolds · 14 mi away
0.14 MGD
Sherrard · 14 mi away
0.15 MGD
North Slope Treatment Plant: 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 May 17, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Significant industrial user · WWTP · all terms