City of Owosso

NPDES permit MI0023752 · Major POTW · effective, expires 2026-10-01 · EPA's file as of 2026-09-19

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EPA's record, 2025-09-01 to 2026-08-31

2values over a limit
3required values missing, on 3 form(s)
4of 12 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (2).

Reporting

Reports are due about 21 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (113)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L Jul, Aug, Sep
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Jun, Oct
001Oxygen, dissolved [DO]DAILY MN >= 3 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspended7 DA AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 1500 lb/qtr all year
001Solids, total suspended7 DA AVG <= 2300 lb/qtr all year
001Nitrogen, ammonia total [as N]MO AVG <= 11 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 15 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 8 mg/L Jun
001Nitrogen, ammonia total [as N]MO AVG <= 530 lb/qtr Jan, Feb, Mar, Apr, May, Nov, Dec
001Nitrogen, ammonia total [as N]7 DA AVG <= 750 lb/qtr Jan, Feb, Mar, Apr, May, Nov, Dec
001Nitrogen, ammonia total [as N]7 DA AVG <= 150 lb/qtr Jul, Aug, Sep
001Nitrogen, ammonia total [as N]7 DA AVG <= 550 lb/qtr Oct
001Nitrogen, ammonia total [as N]7 DA AVG <= 400 lb/qtr Jun
001Phosphorus, total [as P]MO AVG <= 1 mg/L all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG <= 50 lb/qtr all year
001Phosphorus, total [as P]DAILY MX report only all year
001Chloride [as Cl]MO MAX report only all year
001Chloride [as Cl]DAILY MX report only all year
001Sulfate, total [as SO4]MO MAX report only all year
001Sulfate, total [as SO4]DAILY MX report only all year
001BromomethaneMO AVG = 8 mg/L all year
001BromomethaneDAILY MX report only all year
001BromomethaneMO AVG = .42 lb/qtr all year
001BromomethaneDAILY MX report only all year
001HexachlorobenzeneDAILY MX < .01 ug/L all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualDAILY MX <= 38 ug/L all year
001Perfluorooctanoic acid (PFOA)MO AVG report only all year
001Perfluorooctanoic acid (PFOA)DAILY MX report only all year
001Perfluorooctanoic acid (PFOA)MO AVG report only all year
001Perfluorooctanoic acid (PFOA)DAILY MX report only all year
001PerfluorooctanesulfonateMO AVG report only all year
001PerfluorooctanesulfonateDAILY MX report only all year
001PerfluorooctanesulfonateMO AVG report only all year
001PerfluorooctanesulfonateDAILY MX report only all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]MO AVG report only all year
001Mercury, total [as Hg]DAILY MX report only all year
001Mercury, total [as Hg]1D <= 4 ng/L all year
001Mercury, total [as Hg]1D <= .0002 lb/qtr all year
001Coliform, fecal generalMO GEOMN <= 200 #/100mL all year
001Coliform, fecal general7 DA GEO <= 400 #/100mL all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 10 mg/L Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L Jun
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 18 mg/L Oct
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 15 mg/L Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 40 mg/L Jan, Feb, Mar, Apr, May, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 23 mg/L Jun
001BOD, carbonaceous [5 day, 20 C]DAILY MX <= 27 mg/L Oct
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 500 lb/qtr Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 1300 lb/qtr Jan, Feb, Mar, Apr, May, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 750 lb/qtr Jun
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 900 lb/qtr Oct
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 730 lb/qtr Jul, Aug, Sep
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 2000 lb/qtr Jan, Feb, Mar, Apr, May, Nov, Dec
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 1100 lb/qtr Jun
001BOD, carbonaceous [5 day, 20 C]7 DA AVG <= 1400 lb/qtr Oct
001BOD, carb-5 day, 20 deg C, percent removalMINIMUM >= 85 % Jan, Feb, Mar, Apr, May, Nov, Dec
001BOD, carb-5 day, 20 deg C, percent removalDAILY MN report only Jan, Feb, Mar, Apr, May, Nov, Dec
001Solids, suspended percent removalMINIMUM >= 85 % all year
001Solids, suspended percent removalDAILY MN report only all year
SLDSolids, totalMO MIN report only all year
SLDSolids, totalMO AVG report only all year
SLDSolids, totalMO MAX report only all year
SLDArsenic, dry weightMO MIN report only all year
SLDArsenic, dry weightMO AVG report only all year
SLDArsenic, dry weightMO MAX <= 75 mg/kg all year
SLDSelenium, dry weightMO MIN report only all year
SLDSelenium, dry weightMO AVG report only all year
SLDSelenium, dry weightMO MAX <= 100 mg/kg all year
SLDCopper, dry weightMO MIN report only all year
SLDCopper, dry weightMO AVG report only all year
SLDCopper, dry weightMO MAX <= 4300 mg/kg all year
SLDCadmium, dry weightMO MIN report only all year
SLDCadmium, dry weightMO AVG report only all year
SLDCadmium, dry weightMO MAX <= 85 mg/kg all year
SLDNitrogen, total KjeldahlMO MIN report only all year
SLDNitrogen, total KjeldahlMO AVG report only all year
SLDNitrogen, total KjeldahlMO MAX report only all year
SLDMolybdenum, sludge, total, dry weight [as Mo]MO MIN report only all year
SLDMolybdenum, sludge, total, dry weight [as Mo]MO AVG report only all year
SLDMolybdenum, sludge, total, dry weight [as Mo]MO MAX <= 75 mg/kg all year
SLDZinc, sludge, total, dry weight [as Zn]MO MIN report only all year
SLDZinc, sludge, total, dry weight [as Zn]MO AVG report only all year
SLDZinc, sludge, total, dry weight [as Zn]MO MAX <= 7500 mg/kg all year
SLDLead, sludge, total, dry weight [as Pb]MO MIN report only all year
SLDLead, sludge, total, dry weight [as Pb]MO AVG report only all year
SLDLead, sludge, total, dry weight [as Pb]MO MAX <= 840 mg/kg all year
SLDNickel, sludge, total, dry weight [as Ni]MO MIN report only all year
SLDNickel, sludge, total, dry weight [as Ni]MO AVG report only all year
SLDNickel, sludge, total, dry weight [as Ni]MO MAX <= 420 mg/kg all year
SLDNitrogen, sludge, total, dry weight [as N]MO MIN report only all year
SLDNitrogen, sludge, total, dry weight [as N]MO AVG report only all year
SLDNitrogen, sludge, total, dry weight [as N]MO MAX report only all year
SLDMercury, sludge, total, dry weight [as Hg]MO MIN report only all year
SLDMercury, sludge, total, dry weight [as Hg]MO AVG report only all year
SLDMercury, sludge, total, dry weight [as Hg]MO MAX <= 57 mg/kg all year
SLDPotassium, sludge, total, dry weight [as K]MO MIN report only all year
SLDPotassium, sludge, total, dry weight [as K]MO AVG report only all year
SLDPotassium, sludge, total, dry weight [as K]MO MAX report only all year
SLDPhosphorus, sludge, total, dry weight [as P]MO MIN report only all year
SLDPhosphorus, sludge, total, dry weight [as P]MO AVG report only all year
SLDPhosphorus, sludge, total, dry weight [as P]MO MAX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states