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City of Midland

Sewage treatment plant, major discharger, Midland, Michigan. NPDES permit MI0023582 expired Oct 1, 2013; its limits still apply. Last 12 months: no values over a limit, 6 required values missing, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (25 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 7 required values missing, 1 of 13 reports late

Limits in force (84)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspended7-day average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 2500 lb/dall year001
Solids, total suspended7-day average≤ 3800 lb/dall year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jun–Aug001
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jun–Aug001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 1000 lb/dJun–Aug001
Nitrogen, ammonia total [as N]monthly average≤ 1000 lb/dJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jun–Aug001
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year001
Phosphorus, total [as P]monthly average≤ 83 lb/dall year001
Toxicity, choice of speciesmonthly averagereport only (tox chronic)Jan, Apr, Jul, Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximum≤ .038 mg/Lall year001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)Jan, Apr, Jul, Oct001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Mercury, total [as Hg]monthly averagereport only (ng/L)Jan, Apr, Jul, Oct001
Mercury, total [as Hg]monthly maximumreport only (lb/d)Jan, Apr, Jul, Oct001
Mercury, total [as Hg]12-month average≤ 5 ng/LJan, Apr, Jul, Oct001
Mercury, total [as Hg]12-month average≤ .0004 lb/dJan, Apr, Jul, Oct001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 13 mg/LJun–Aug001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 19 mg/LJun–Aug001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2100 lb/dJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 1100 lb/dJun–Aug001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 3300 lb/dJan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1600 lb/dJun–Aug001
BOD, carb-5 day, 20 deg C, percent removalminimum≥ 85 %Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec001
Solids, suspended percent removalmonthly average minimum≥ 75 %Feb, Mar, Apr, May, Sep, Oct, Nov001
Solids, suspended percent removalminimum≥ 85 %Jan, Jun, Jul, Aug, Dec001
TU Static 24 Hr Acute Pimephales promelasdaily maximumreport only (tox acute)Jan, Apr, Jul, Oct001
Static 48 Hr Chronic Pimphales Promelasmonthly averagereport only (tox chronic)Jan, Apr, Jul, Oct001
Solids, totalmonthly minimumreport only (%)OctSLD
Solids, totalmonthly averagereport only (%)OctSLD
Solids, totalmonthly totalreport only (%)OctSLD
Arsenic, dry weightmonthly minimumreport only (mg/kg)OctSLD
Arsenic, dry weightmonthly averagereport only (mg/kg)OctSLD
Arsenic, dry weightmonthly maximumreport only (mg/kg)OctSLD
Selenium, dry weightmonthly minimumreport only (mg/kg)OctSLD
Selenium, dry weightmonthly averagereport only (mg/kg)OctSLD
Selenium, dry weightmonthly maximumreport only (mg/kg)OctSLD
Copper, dry weightmonthly minimumreport only (mg/kg)OctSLD
Copper, dry weightmonthly averagereport only (mg/kg)OctSLD
Copper, dry weightmonthly maximumreport only (mg/kg)OctSLD
Cadmium, dry weightmonthly minimumreport only (mg/kg)OctSLD
Cadmium, dry weightmonthly averagereport only (mg/kg)OctSLD
Cadmium, dry weightmonthly maximumreport only (mg/kg)OctSLD
Nitrogen, total Kjeldahlmonthly minimumreport only (mg/kg)OctSLD
Nitrogen, total Kjeldahlmonthly averagereport only (mg/kg)OctSLD
Nitrogen, total Kjeldahlmonthly maximumreport only (mg/kg)OctSLD
Molybdenum, sludge, total, dry weight [as Mo]monthly minimumreport only (mg/kg)OctSLD
Molybdenum, sludge, total, dry weight [as Mo]monthly averagereport only (mg/kg)OctSLD
Molybdenum, sludge, total, dry weight [as Mo]monthly maximumreport only (mg/kg)OctSLD
Zinc, sludge, total, dry weight [as Zn]monthly minimumreport only (mg/kg)OctSLD
Zinc, sludge, total, dry weight [as Zn]monthly averagereport only (mg/kg)OctSLD
Zinc, sludge, total, dry weight [as Zn]monthly maximumreport only (mg/kg)OctSLD
Lead, sludge, total, dry weight [as Pb]monthly minimumreport only (mg/kg)OctSLD
Lead, sludge, total, dry weight [as Pb]monthly averagereport only (mg/kg)OctSLD
Lead, sludge, total, dry weight [as Pb]monthly maximumreport only (mg/kg)OctSLD
Nickel, sludge, total, dry weight [as Ni]monthly minimumreport only (mg/kg)OctSLD
Nickel, sludge, total, dry weight [as Ni]monthly averagereport only (mg/kg)OctSLD
Nickel, sludge, total, dry weight [as Ni]monthly maximumreport only (mg/kg)OctSLD
Nitrogen, sludge, total, dry weight [as N]monthly minimumreport only (mg/kg)OctSLD
Nitrogen, sludge, total, dry weight [as N]monthly averagereport only (mg/kg)OctSLD
Nitrogen, sludge, total, dry weight [as N]monthly maximumreport only (mg/kg)OctSLD
Mercury, sludge, total, dry weight [as Hg]monthly minimumreport only (mg/kg)OctSLD
Mercury, sludge, total, dry weight [as Hg]monthly averagereport only (mg/kg)OctSLD
Mercury, sludge, total, dry weight [as Hg]monthly maximumreport only (mg/kg)OctSLD
Potassium, sludge, total, dry weight [as K]monthly minimumreport only (mg/kg)OctSLD
Potassium, sludge, total, dry weight [as K]monthly averagereport only (mg/kg)OctSLD
Potassium, sludge, total, dry weight [as K]monthly maximumreport only (mg/kg)OctSLD
Phosphorus, sludge, total, dry weight [as P]monthly minimumreport only (mg/kg)OctSLD
Phosphorus, sludge, total, dry weight [as P]monthly averagereport only (mg/kg)OctSLD
Phosphorus, sludge, total, dry weight [as P]monthly maximumreport only (mg/kg)OctSLD

How strict are these limits?

Cited limits by parameter: Michigan's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0023582 · MCP: https://passage-data.com/mcp