Industrial users of Warren Waste Water Treatment Plant
Warren, Michigan · 14 industrial users on record · 6 sampled for PFAS · 6 above 12 ng/L PFOS
In short
Warren Waste Water Treatment Plant in Warren treats 12.1 MGD and receives process wastewater from 14 industrial users on record in its pretreatment programme, led by metal finishing and plating (8) and automotive, metal and equipment manufacturing (3). 4 are categorical users under federal pretreatment standards. 6 of them have been sampled for PFAS (23 samples, 2023); 6 had a sample with PFOS above the 12 ng/L screening level.
PFAS sampling of the plant's industrial users
- Users sampled
- 6
- of 14 on record
- Above 12 ng/L PFOS
- 6
- 15 of 23 PFOS samples
- Highest PFOS sample
- 11,000 ng/L
- Modern Hard Chrome Service Co
- Latest sample
- Nov 2023
- 23 samples in all
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.
5 of 14 industrial users
| # | Industrial user | Industry | Type | Highest PFOS | Latest PFOS | Samples |
|---|---|---|---|---|---|---|
| 1 | Modern Hard Chrome Service Co · Warren | Metal finishing and plating | Categorical | 11,000 ng/L917× · Jun 2023 | 440 ng/LNov 2023 | 5 |
| 2 | B&L Plating · Warren | Metal finishing and plating | Categorical | 401 ng/L33× · May 2023 | 73 ng/LOct 2023 | 3 |
| 3 | General Motors Technical Center · Warren | Automotive, metal and equipment manufacturing | Significant | 300 ng/L25× · Apr 2023 | 50 ng/LNov 2023 | 7 |
| 4 | Detroit Arsenal · Warren | Automotive, metal and equipment manufacturing | Significant | 32 ng/L2.7× · Nov 2023 | 20 ng/LNov 2023 | 2 |
| 5 | Norbrook Plating · Warren | Metal finishing and plating | Categorical | 26 ng/L2.2× · Nov 2023 | 26 ng/LNov 2023 | 4 |
Unlock 9 more industrial users of this plant
For every industrial user of Warren Waste Water Treatment Plant: discharge flow, federal category, full PFAS sampling history, source documents and contacts. Free with a Klarifi account.
Or let Klarifi Plus run the outreach for you →Industrial users discharging to Warren Waste Water Treatment Plant, ordered by their highest PFOS sample; the first 5 of 14. Source: PFAS sampling reports that treatment plants file with EGLE under the IPP PFAS Initiative (MiEnviro Portal), extracted by Klarifi.
Industrial users by industry
| Industry | Industrial users |
|---|---|
| Metal finishing and plating | 8 |
| Automotive, metal and equipment manufacturing | 3 |
| Chemicals, plastics and petroleum | 1 |
| Food and beverage | 1 |
| Other industries | 1 |
The largest groups, from each user's NAICS code.
Industrial users of Warren Waste Water Treatment Plant: 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 September 18, 2026.
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.