Northfield WWTP
1450 Highway 3 North, Northfield, MN 55057 · Rice County · Publicly Owned Treatment Works
- Average flow
- 1.86 MGD
- Design flow
- 5.2 MGD
- NPDES permit
- MN0024368
- Effective
- Permit expires
- September 2031
- Population served
- 23,826
- CWNS 2022
Northfield WWTP is a publicly owned wastewater treatment works in Northfield, Rice County, Minnesota treating an average of 1.86 million gallons per day against a permitted design capacity of 5.2 MGD, serving about 23,826 residents. It discharges under NPDES permit MN0024368 (effective), which expires in September 2031, with 0 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Northfield WWTP.
Available with a free Klarifi account
See the full treatment train at Northfield WWTP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Northfield
Northfield's capital improvement plan lists 48 water, sewer and wastewater line items worth $20M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Northfield →
| Project | Budget | Years |
|---|---|---|
| NW Area Water Tower | $5,000,000 | 2026–2026 |
| Highway 19 Trunk Watermain & Repairs | $3,000,000 | 2027–2027 |
| Meter Replacement | $2,000,000 | 2027–2027 |
| St. Olaf North Ground Storage Tank Painting | $1,000,000 | 2028–2028 |
| St. Olaf South Ground Storage Tank Painting | $1,000,000 | 2027–2027 |
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
Decision-makers at Northfield WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in Minnesota
Dennison · 7 mi away
—
Faribault · 7 mi away
—
Nerstrand · 10 mi away
0.01 MGD
Hampton · 12 mi away
—
Lonsdale · 13 mi away
0.28 MGD
Cannon Falls · 13 mi away
0.26 MGD
Farmington · 13 mi away
11.65 MGD
Kenyon · 16 mi away
0.18 MGD
Northfield WWTP: 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 20, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms