Ki Sawyer WWTP-Marquette Co
1080 M-94, Gwinn, MI 49841 · Marquette County · Publicly Owned Treatment Works
- Average flow
- 0.18 MGD
- Design flow
- —
- NPDES permit
- MI0021423
- Effective
- Permit expires
- October 2030
- Population served
- —
- CWNS 2022
Ki Sawyer WWTP-Marquette Co is a publicly owned wastewater treatment works in Gwinn, Marquette County, Michigan treating an average of 0.18 million gallons per day. It discharges under NPDES permit MI0021423 (effective), which expires in October 2030, with 6 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Ki Sawyer WWTP-Marquette Co.
Available with a free Klarifi account
See the full treatment train at Ki Sawyer WWTP-Marquette Co: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 6
- Effluent violations
- 5
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Industrial users and pretreatment
Industries that discharge process wastewater to Ki Sawyer WWTP-Marquette Co, from the plant's pretreatment programme records.
- Industrial users
- 3
- 2 categorical
- Sampled for PFAS
- 3
- 2023–2024
- Above 12 ng/L PFOS
- 1
- highest 1,900 ng/L
The highest PFOS samples came from Marquette Sawyer Regional Airport (Gwinn), 1,900 ng/L; Argonics Inc (Gwinn), 4 ng/L; Superior Extrusion INC (Gwinn), 1.8 ng/L. Most users are in airports and military sites and automotive, metal and equipment manufacturing.
Industrial users of Ki Sawyer WWTP-Marquette Co →PFAS sources at all Michigan plants →
Unlock the details behind these industrial users
Discharge flow, federal category, full PFAS sampling history, source documents and contacts for every industrial user of Ki Sawyer WWTP-Marquette Co. Free with a Klarifi account.
Key contacts
2 verified contacts for Ki Sawyer WWTP-Marquette Co, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Ki Sawyer WWTP-Marquette Co, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Michigan
Gwinn · 5 mi away
—
Marquette · 13 mi away
2.86 MGD
Palmer · 13 mi away
0.03 MGD
Ishpeming · 18 mi away
1.48 MGD
Rock · 27 mi away
0.43 MGD
Republic · 29 mi away
—
Munising · 35 mi away
0.48 MGD
Channing · 36 mi away
0.9 MGD
Ki Sawyer WWTP-Marquette Co: 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 July 11, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Ozonation · Activated sludge · all terms