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City of Sandusky

Sewage treatment plant, Sandusky, Michigan. NPDES permit MI0020222, in force until Oct 1, 2028. Last 12 months: over a limit 25 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 21 days after each period: outfall 001 form A monthly (31 values), outfall SLD form L yearly (42 values)
Renewal application due
Apr 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
15 values over a limit, 0 required values missing, 0 of 13 reports late

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

All 25 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum2.2≤ 2 mg/L10%
October 2025Phosphorus, total [as P], monthly average.52≤ .5 mg/L4%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average37≤ 32 lb/d16%
April 2026Coliform, fecal general, 7-day geometric mean1069≤ 400 #/100mL167%
April 2026Coliform, fecal general, monthly geometric mean284≤ 200 #/100mL42%
April 2026Nitrogen, ammonia total [as N], 7-day average31≤ 16 lb/d94%
April 2026Nitrogen, ammonia total [as N], daily maximum10.4≤ 2 mg/L420%
April 2026Nitrogen, ammonia total [as N], monthly average1.2≤ .5 mg/L140%
April 2026Nitrogen, ammonia total [as N], monthly average11.7≤ 4 lb/d193%
April 2026Phosphorus, total [as P], monthly average5≤ 4 lb/d25%
April 2026Solids, total suspended, 7-day average42.4≤ 30 mg/L41%
April 2026Solids, total suspended, 7-day average482≤ 240 lb/d101%
April 2026Solids, total suspended, monthly average206≤ 160 lb/d29%
June 2026Coliform, fecal general, 7-day geometric mean718≤ 400 #/100mL80%
June 2026Coliform, fecal general, monthly geometric mean272≤ 200 #/100mL36%
June 2026Solids, total suspended, 7-day average258≤ 240 lb/d8%
June 2026Solids, total suspended, 7-day average44.9≤ 30 mg/L50%
June 2026Solids, total suspended, monthly average20.5≤ 20 mg/L3%
July 2026Coliform, fecal general, 7-day geometric mean669≤ 400 #/100mL67%
July 2026Nitrogen, ammonia total [as N], daily maximum6.5≤ 2 mg/L225%
July 2026Nitrogen, ammonia total [as N], monthly average.8≤ .5 mg/L60%
July 2026Nitrogen, ammonia total [as N], monthly average4.8≤ 4 lb/d20%
August 2026Coliform, fecal general, 7-day geometric mean1646≤ 400 #/100mL312%
September 2026Coliform, fecal general, 7-day geometric mean591≤ 400 #/100mL48%
September 2026Nitrogen, ammonia total [as N], daily maximum2.6≤ 2 mg/L30%

Limits in force (88)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily minimum≥ 7 mg/Lall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspended7-day average≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 160 lb/dall year001
Solids, total suspended7-day average≤ 240 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ .5 mg/LApr–Dec001
Nitrogen, ammonia total [as N]monthly average≤ 15 mg/LJan, Feb001
Nitrogen, ammonia total [as N]daily maximum≤ 2 mg/LApr–Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb001
Nitrogen, ammonia total [as N]daily maximum≤ 5.2 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 4 lb/dApr–Dec001
Nitrogen, ammonia total [as N]monthly average≤ 120 lb/dJan, Feb001
Nitrogen, ammonia total [as N]7-day average≤ 41 lb/dMar001
Nitrogen, ammonia total [as N]7-day average≤ 16 lb/dApr–Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jan, Feb001
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Mar001
Phosphorus, total [as P]monthly average≤ .5 mg/Lall year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ 4 lb/dall year001
Phosphorus, total [as P]daily maximumreport only (lb/d)all year001
Chloride [as Cl]daily maximumreport only (mg/L)all year001
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year001
Cyanide [A]daily maximumreport only (ug/L)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Perfluorooctanesulfonatedaily maximumreport only (ng/L)all year001
Mercury, total [as Hg]monthly averagereport only (ng/L)all year001
Mercury, total [as Hg]daily maximumreport only (ng/L)all year001
Mercury, total [as Hg]monthly averagereport only (lb/d)all year001
Mercury, total [as Hg]daily maximumreport only (lb/d)all year001
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≤ 11 mg/LJan, Feb001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 4 mg/LApr–Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 7 mg/LMar001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 16 mg/LJan, Feb001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/LApr–Dec001
BOD, carbonaceous [5 day, 20 C]daily maximum≤ 10 mg/LMar001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 87 lb/dJan, Feb001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 32 lb/dApr–Dec001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 55 lb/dMar001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 130 lb/dJan, Feb001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 79 lb/dApr–Dec001
BOD, carbonaceous [5 day, 20 C]7-day average≤ 79 lb/dMar001
Solids, totalmonthly minimumreport only (%)all yearSLD
Solids, totalmonthly averagereport only (%)all yearSLD
Solids, totalmonthly maximumreport only (%)all yearSLD
Arsenic, dry weightmonthly minimumreport only (mg/kg)all yearSLD
Arsenic, dry weightmonthly averagereport only (mg/kg)all yearSLD
Arsenic, dry weightmonthly maximum≤ 75 mg/kgall yearSLD
Selenium, dry weightmonthly minimumreport only (mg/kg)all yearSLD
Selenium, dry weightmonthly averagereport only (mg/kg)all yearSLD
Selenium, dry weightmonthly maximum≤ 100 mg/kgall yearSLD
Copper, dry weightmonthly minimumreport only (mg/kg)all yearSLD
Copper, dry weightmonthly averagereport only (mg/kg)all yearSLD
Copper, dry weightmonthly maximum≤ 4300 mg/kgall yearSLD
Cadmium, dry weightmonthly minimumreport only (mg/kg)all yearSLD
Cadmium, dry weightmonthly averagereport only (mg/kg)all yearSLD
Cadmium, dry weightmonthly maximum≤ 85 mg/kgall yearSLD
Nitrogen, total Kjeldahlmonthly minimumreport only (mg/kg)all yearSLD
Nitrogen, total Kjeldahlmonthly averagereport only (mg/kg)all yearSLD
Nitrogen, total Kjeldahlmonthly maximumreport only (mg/kg)all yearSLD
Molybdenum, sludge, total, dry weight [as Mo]monthly minimumreport only (mg/kg)all yearSLD
Molybdenum, sludge, total, dry weight [as Mo]monthly averagereport only (mg/kg)all yearSLD
Molybdenum, sludge, total, dry weight [as Mo]monthly maximum≤ 75 mg/kgall yearSLD
Zinc, sludge, total, dry weight [as Zn]monthly minimumreport only (mg/kg)all yearSLD
Zinc, sludge, total, dry weight [as Zn]monthly averagereport only (mg/kg)all yearSLD
Zinc, sludge, total, dry weight [as Zn]monthly maximum≤ 7500 mg/kgall yearSLD
Lead, sludge, total, dry weight [as Pb]monthly minimumreport only (mg/kg)all yearSLD
Lead, sludge, total, dry weight [as Pb]monthly averagereport only (mg/kg)all yearSLD
Lead, sludge, total, dry weight [as Pb]monthly maximum≤ 840 mg/kgall yearSLD
Nickel, sludge, total, dry weight [as Ni]monthly minimumreport only (mg/kg)all yearSLD
Nickel, sludge, total, dry weight [as Ni]monthly averagereport only (mg/kg)all yearSLD
Nickel, sludge, total, dry weight [as Ni]monthly maximum≤ 420 mg/kgall yearSLD
Nitrogen, sludge, total, dry weight [as N]monthly minimumreport only (mg/kg)all yearSLD
Nitrogen, sludge, total, dry weight [as N]monthly averagereport only (mg/kg)all yearSLD
Nitrogen, sludge, total, dry weight [as N]monthly maximumreport only (mg/kg)all yearSLD
Mercury, sludge, total, dry weight [as Hg]monthly minimumreport only (mg/kg)all yearSLD
Mercury, sludge, total, dry weight [as Hg]monthly averagereport only (mg/kg)all yearSLD
Mercury, sludge, total, dry weight [as Hg]monthly maximum≤ 57 mg/kgall yearSLD
Potassium, sludge, total, dry weight [as K]monthly minimumreport only (mg/kg)all yearSLD
Potassium, sludge, total, dry weight [as K]monthly averagereport only (mg/kg)all yearSLD
Potassium, sludge, total, dry weight [as K]monthly maximumreport only (mg/kg)all yearSLD
Phosphorus, sludge, total, dry weight [as P]monthly minimumreport only (mg/kg)all yearSLD
Phosphorus, sludge, total, dry weight [as P]monthly averagereport only (mg/kg)all yearSLD
Phosphorus, sludge, total, dry weight [as P]monthly maximumreport only (mg/kg)all yearSLD

New limits from Sep 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Perfluorooctanesulfonate, monthly average0.000095 lb/dnew——
Perfluorooctanesulfonate, monthly average12 ng/Lnew——

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/MI0020222 · MCP: https://passage-data.com/mcp