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City of Au Gres WWTP

Sewerage Systems, Au Gres, Michigan. NPDES permit MI0058794, in force until Oct 1, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: form A monthly (27 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 13 reports late

Limits in force (31)

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≤ 100 lb/dall year
Solids, total suspended7-day average≤ 150 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 19 mg/LJun–Aug
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jun–Aug
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 63 lb/dJun–Aug
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jun–Aug
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≤ 3.3 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Perfluorooctanesulfonatedaily maximumreport only (ng/L)all 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≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 83 lb/dall year
BOD, carbonaceous [5 day, 20 C]7-day average≤ 130 lb/dall year
BOD, carb-5 day, 20 deg C, percent removalminimum≥ 85 %all year
BOD, carb-5 day, 20 deg C, percent removaldaily minimumreport only (%)all year
Solids, suspended percent removalminimum≥ 85 %all year
Solids, suspended percent removaldaily minimumreport only (%)all year

New limits from Jun 1, 2029

ParameterNew limitFromNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average11 mg/L (Jun–Aug)Jun 1, 2029tighter——
Nitrogen, ammonia total [as N], monthly average37 lb/d (Jun–Aug)Jun 1, 2029tighter——
Perfluorooctanesulfonate, monthly average0.00004 lb/dSep 1, 2029new——
Perfluorooctanesulfonate, monthly average12 ng/LSep 1, 2029new——

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/MI0058794 · MCP: https://passage-data.com/mcp