Industrial users of Ki Sawyer WWTP-Marquette Co
Gwinn, Michigan · 3 industrial users on record · 3 sampled for PFAS · 1 above 12 ng/L PFOS
Ki Sawyer WWTP-Marquette Co in Gwinn treats 0.18 MGD and receives process wastewater from 3 industrial users on record in its pretreatment programme, led by airports and military sites (1) and automotive, metal and equipment manufacturing (1). 2 are categorical users under federal pretreatment standards. 3 of them have been sampled for PFAS (8 samples, 2023–2024); 1 had a sample with PFOS above the 12 ng/L screening level.
- Ki Sawyer WWTP-Marquette Co: permit, flow and compliance
- PFAS sources at all Michigan plants
- All treatment plants in Michigan
- What is a significant industrial user?
PFAS sampling of the plant's industrial users
- Users sampled
- 3
- Above 12 ng/L PFOS
- 1
- Highest PFOS sample
- 1,900 ng/L
- Latest sample
- May 2024
12 ng/L is Michigan’s surface water quality value for PFOS and the screening criterion of the initiative; 170 ng/L is the value for PFOA since July 2022. Both apply to what a treatment plant discharges to a river or lake, not to what a factory sends to the sewer. An industrial user above the level has not broken a limit: it is a source the receiving plant has to follow up with sampling, a reduction plan or pretreatment.
Industrial users on record
| # | Industrial user | Industry | Type | Highest PFOS | Latest PFOS | Samples |
|---|---|---|---|---|---|---|
| 1 | Marquette Sawyer Regional Airport · Gwinn | Airports and military sites | — | 1,900 ng/L158× · Jan 2023 | 335 ng/LMay 2024 | 6 |
| 2 | Argonics Inc · Gwinn | Chemicals, plastics and petroleum | Categorical | 4 ng/LApr 2023 | 4 ng/LApr 2023 | 1 |
| 3 | Superior Extrusion INC · Gwinn | Automotive, metal and equipment manufacturing | Categorical | 1.8 ng/LDec 2023 | 1.8 ng/LDec 2023 | 1 |
Industrial users by industry
| Industry | Industrial users |
|---|---|
| Airports and military sites | 1 |
| Automotive, metal and equipment manufacturing | 1 |
| Chemicals, plastics and petroleum | 1 |
The largest groups, from each user's NAICS code.
Industrial users of Ki Sawyer WWTP-Marquette Co: questions
Which industries discharge to Ki Sawyer WWTP-Marquette Co?
3 industrial users on record discharge process wastewater to Ki Sawyer WWTP-Marquette Co in Gwinn, most of them in airports and military sites (1), automotive, metal and equipment manufacturing (1), chemicals, plastics and petroleum (1). 2 are categorical users, subject to federal pretreatment standards for their industry.
Has PFAS been found in wastewater sent to Ki Sawyer WWTP-Marquette Co?
3 of the plant’s industrial users have been sampled for PFAS, 8 samples in 2023–2024. 1 had at least one sample with PFOS above the 12 ng/L screening level; the highest was 1,900 ng/L. The level is a surface water quality value, so a sample above it marks a source the plant has to follow up, not a violation by the company.
What is an industrial pretreatment programme?
Under the Clean Water Act a treatment plant that receives industrial wastewater has to control it at the source: it permits its significant industrial users, sets local limits, inspects and samples them, and reports to the state each year. The aim is to stop pollutants that pass through or disrupt the plant, or end up in its biosolids.
Where do I find more about the industrial users of Ki Sawyer WWTP-Marquette Co?
This page names all 3 on record. What it leaves out, each user’s discharge flow, federal category, PFAS sampling history, source documents and contacts, is available with a free Klarifi account.
Industrial users: PFAS sampling reports that treatment plants file with EGLE under the IPP PFAS Initiative (MiEnviro Portal), extracted by Klarifi. Values are as reported by the receiving plant; a value shared by several compounds in one sample is read as the laboratory’s reporting limit and not counted as a detection. Spotted an error? Tell us and we correct it.
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