NPDES permit MI0002500 · Major NON-POTW · effective, expires 2026-10-01 · EPA's file as of 2026-09-19
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Last period with anything received: 2026-07-31.
Reports are due about 21 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).
| Outfall | Parameter | Statistic | Limit | Months |
|---|---|---|---|---|
| 001 | Oxygen, dissolved [DO] | DAILY MN | >= 4 mg/L | all year |
| 001 | BOD, 5-day, 20 deg. C | MO AVG | report only | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | BOD, 5-day, 20 deg. C | MO AVG | report only | Jun, Jul, Aug, Sep |
| 001 | BOD, 5-day, 20 deg. C | DAILY MX | report only | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | BOD, 5-day, 20 deg. C | DAILY MX | report only | Jun, Jul, Aug, Sep |
| 001 | BOD, 5-day, 20 deg. C | MO AVG | <= 13220 lb/qtr | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | BOD, 5-day, 20 deg. C | MO AVG | <= 10000 lb/qtr | Jun, Jul, Aug, Sep |
| 001 | BOD, 5-day, 20 deg. C | DAILY MX | <= 21450 lb/qtr | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | BOD, 5-day, 20 deg. C | DAILY MX | <= 20000 lb/qtr | Jun, Jul, Aug, Sep |
| 001 | pH | DAILY MN | >= 6.5 SU | all year |
| 001 | pH | DAILY MX | <= 9 SU | all year |
| 001 | Solids, total suspended | MO AVG | report only | Jun, Jul, Aug, Sep |
| 001 | Solids, total suspended | MO AVG | report only | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | Solids, total suspended | DAILY MX | report only | Jun, Jul, Aug, Sep |
| 001 | Solids, total suspended | DAILY MX | report only | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | Solids, total suspended | MO AVG | <= 11000 lb/qtr | Jun, Jul, Aug, Sep |
| 001 | Solids, total suspended | MO AVG | <= 15000 lb/qtr | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | Solids, total suspended | DAILY MX | <= 32000 lb/qtr | Jun, Jul, Aug, Sep |
| 001 | Solids, total suspended | DAILY MX | <= 32520 lb/qtr | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec |
| 001 | Oil & Grease | DAILY MX | <= 10 mg/L | all year |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | report only | all year |
| 001 | Nitrogen, ammonia total [as N] | DAILY MX | report only | all year |
| 001 | Nitrogen, ammonia total [as N] | MO AVG | report only | all year |
| 001 | Nitrogen, ammonia total [as N] | DAILY MX | report only | all year |
| 001 | Phosphorus, total [as P] | MO AVG | report only | all year |
| 001 | Phosphorus, total [as P] | DAILY MX | report only | all year |
| 001 | Phosphorus, total [as P] | MO AVG | <= 40 lb/qtr | all year |
| 001 | Phosphorus, total [as P] | DAILY MX | report only | all year |
| 001 | Copper, total [as Cu] | DAILY MX | = 65 ug/L | all year |
| 001 | Copper, total [as Cu] | DAILY MX | = 1.8 lb/qtr | all year |
| 001 | Toxicity, choice of species | MO AVG | <= 11 tox chronic | all year |
| 001 | Toxicity, choice of species | VALUE | report only | all year |
| 001 | Flow, in conduit or thru treatment plant | MO AVG | report only | all year |
| 001 | Flow, in conduit or thru treatment plant | DAILY MX | report only | all year |
| 001 | Spectrus CT 1300 | DAILY MX | <= 15 ug/L | all year |
| 001 | Toxicity [acute], Ceriodaphnia dubia | DAILY MX | <= 1 tox acute | all year |
| 001 | Mercury, total [as Hg] | MO AVG | report only | all year |
| 001 | Mercury, total [as Hg] | DAILY MX | report only | all year |
| 001 | Mercury, total [as Hg] | MO AVG | report only | all year |
| 001 | Mercury, total [as Hg] | DAILY MX | report only | all year |
| 001 | Mercury, total [as Hg] | 1D | <= 4 ng/L | all year |
| 001 | Mercury, total [as Hg] | 1D | <= .0001 lb/qtr | all year |
| 001 | Outfall observation,visual, y/n response | VALUE | report only | all year |
| 001 | TU Static 24 Hr Acute Pimephales promelas | DAILY MX | <= 1 tox acute | all year |
| 001 | Static 48 Hr Chronic Pimphales Promelas | MO AVG | <= 11 tox chronic | all year |
| 001 | Static 48 Hr Chronic Pimphales Promelas | VALUE | report only | all year |
| 002 | Temperature, water deg. fahrenheit | DAILY MX | report only | all year |
| 002 | Temperature, water deg. fahrenheit | DAILY MX | report only | all year |
| 002 | Thermal Discharge | DAILY MX | <= 76 MBTU/hr | all year |
| 002 | Oxygen, dissolved [DO] | DAILY MN | >= 4 mg/L | all year |
| 002 | pH | DAILY MN | >= 6.5 SU | all year |
| 002 | pH | DAILY MX | <= 9 SU | all year |
| 002 | Flow, in conduit or thru treatment plant | MO AVG | report only | all year |
| 002 | Flow, in conduit or thru treatment plant | DAILY MX | report only | all year |
| 002 | Flow, in conduit or thru treatment plant | MO AVG | report only | all year |
| 002 | Flow, in conduit or thru treatment plant | DAILY MX | report only | all year |
| 002 | Chlorine, total residual | DAILY MX | <= 38 ug/L | all year |
| 002 | Chlorine, total residual | DA | = 200 ug/L | all year |
| 002 | Chlorine, total residual | INST MAX | <= 300 ug/L | all year |
| 002 | Chlorination duration | DAILY MX | report only | all year |
| 002 | Chlorination duration | DAILY MX | = 160 min/d | all year |
| 002 | Outfall observation,visual, y/n response | VALUE | report only | all year |
| 002 | Cooling Water Intake Velocity | DAILY MX | = .5 ft/sec | all year |
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