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Gogebic-Iron Wastewater Authority

Sewage treatment plant, major discharger, Ironwood, Michigan. NPDES permit MI0020125, in force until Oct 1, 2029. Last 12 months: over a limit 4 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (43 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 0 of 13 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
March 2026Solids, suspended percent removal, minimum72≥ 85 %87%
March 2026Solids, total suspended, 7-day average1306≤ 1300 lb/d0%
April 2026Solids, suspended percent removal, minimum80≥ 85 %33%
September 2026Cyanide [A], monthly average< 10≤ 5.9 ug/L69%

Limits in force (56)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 4 mg/Lall year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 850 lb/dall year
Solids, total suspended7-day average≤ 1300 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 11 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 2.3 mg/LJul–Sep
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 4.5 mg/LJun
Nitrogen, ammonia total [as N]7-day average≤ 65 lb/dJul–Sep
Nitrogen, ammonia total [as N]monthly average≤ 310 lb/dJan, Feb, Mar, Apr, May, Oct, Nov, Dec
Nitrogen, ammonia total [as N]7-day average≤ 130 lb/dJun
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jul–Sep
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jun
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 28 lb/dall year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximumreport only (ug/L)all year
Silver, total [as Ag]monthly average≤ 1.4 ug/Lall year
Silver, total [as Ag]daily maximumreport only (ug/L)all year
Silver, total [as Ag]monthly average≤ .04 lb/dall year
Silver, total [as Ag]daily maximumreport only (lb/d)all year
Cyanide [A]monthly average≤ 5.9 ug/Lall year
Cyanide [A]daily maximumreport only (ug/L)all year
Cyanide [A]monthly average≤ .17 lb/dall year
Cyanide [A]daily maximumreport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualdaily maximum≤ 38 ug/Lall year
Perfluorooctanesulfonatedaily maximumreport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (ng/L)all year
Mercury, total [as Hg]daily maximumreport only (ng/L)all year
Mercury, total [as Hg]monthly averagereport only (lb/d)all year
Mercury, total [as Hg]daily maximumreport only (lb/d)all year
Mercury, total [as Hg]12-month average≤ 3 ng/Lall year
Mercury, total [as Hg]12-month average≤ .000085 lb/dall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal general7-day geometric mean≤ 400 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LJun–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 15 mg/LJun–Sep
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 280 lb/dJun–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 710 lb/dJan, Feb, Mar, Apr, May, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]7-day average≤ 430 lb/dJun–Sep
BOD, carbonaceous [5 day, 20 C]7-day average≤ 1100 lb/dJan, Feb, Mar, Apr, May, Oct, Nov, Dec
BOD, carb-5 day, 20 deg C, percent removalminimum≥ 85 %Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
BOD, carb-5 day, 20 deg C, percent removaldaily minimumreport only (%)Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
Solids, suspended percent removalminimum≥ 85 %all year
Solids, suspended percent removaldaily minimumreport only (%)all year

New limits from Sep 1, 2029

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average5.1 mg/L (Jan, Feb, Mar, Oct, Nov, Dec)tighter0.025 mg/L (6 values)0.0049×
Nitrogen, ammonia total [as N], monthly average140 lb/d (Jan, Feb, Mar, Oct, Nov, Dec)tighter0.3 lb/d (6 values)0.00214×

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MI0020125 · MCP: https://passage-data.com/mcp