Saginaw Charter Township — NPDES permit MI0023973: limits, due date and EPA's record

NPDES permit MI0023973 · Major POTW · effective, expires 2028-10-01 · EPA's file as of 2026-09-19

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

Last period with anything received: 2026-07-31. Most often over: pH (2), Coliform, fecal general (2), Solids, total suspended (1).

Reporting

Reports are due about 21 days after each monitoring period ends (the most common figure among MI permits in EPA's filings — check your permit).

Limits in force (98)

Outfall	Parameter	Statistic	Limit	Months
001	Oxygen, dissolved [DO]	DAILY MN	>= 3 mg/L	all year
001	pH	DAILY MN	>= 6.5 SU	all year
001	pH	DAILY MX	<= 9 SU	all year
001	Solids, total suspended	MO AVG	<= 30 mg/L	all year
001	Solids, total suspended	7 DA AVG	<= 45 mg/L	all year
001	Solids, total suspended	MO AVG	<= 1600 lb/d	all year
001	Solids, total suspended	7 DA AVG	<= 2400 lb/d	all year
001	Nitrogen, ammonia total [as N]	DAILY MX	report only	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	Nitrogen, ammonia total [as N]	DAILY MX	<= 15 mg/L	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	7 DA AVG	<= 810 lb/d	Jun, Jul, Aug
001	Nitrogen, ammonia total [as N]	DAILY MX	report only	Jun, Jul, Aug
001	Phosphorus, total [as P]	MO AVG	<= 1 mg/L	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Phosphorus, total [as P]	MO AVG	<= 40 lb/d	all year
001	Phosphorus, total [as P]	DAILY MX	report only	all year
001	Chloride [as Cl]	DAILY MX	report only	all year
001	Sulfate, total [as SO4]	DAILY MX	report only	all year
001	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
001	Flow, in conduit or thru treatment plant	DAILY MX	report only	all year
001	Chlorine, total residual	DAILY MX	<= 38 ug/L	all year
001	Perfluorooctanesulfonate	DAILY MX	report only	all year
001	Mercury, total [as Hg]	MO AVG	report only	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
001	Mercury, total [as Hg]	MO AVG	report only	all year
001	Mercury, total [as Hg]	DAILY MX	report only	all year
001	Mercury, total [as Hg]	1D	<= 2 ng/L	all year
001	Mercury, total [as Hg]	1D	<= .00011 lb/d	all year
001	Coliform, fecal general	MO GEOMN	<= 200 #/100mL	all year
001	Coliform, fecal general	7 DA GEO	<= 400 #/100mL	all year
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 25 mg/L	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 20 mg/L	Jun, Jul, Aug
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 40 mg/L	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	BOD, carbonaceous [5 day, 20 C]	DAILY MX	<= 30 mg/L	Jun, Jul, Aug
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 1400 lb/d	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 1100 lb/d	Jun, Jul, Aug
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 2200 lb/d	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	BOD, carbonaceous [5 day, 20 C]	7 DA AVG	<= 1600 lb/d	Jun, Jul, Aug
001	BOD, carb-5 day, 20 deg C, percent removal	MINIMUM	>= 85 %	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	BOD, carb-5 day, 20 deg C, percent removal	DAILY MN	report only	Jan, Feb, Mar, Apr, May, Sep, Oct, Nov, Dec
001	Solids, suspended percent removal	MINIMUM	>= 85 %	all year
001	Solids, suspended percent removal	DAILY MN	report only	all year
003	Oxygen, dissolved [DO]	DAILY MN	report only	all year
003	pH	DAILY MN	report only	all year
003	pH	MAXIMUM	report only	all year
003	Solids, total suspended	MAXIMUM	report only	all year
003	Nitrogen, ammonia total [as N]	MAXIMUM	report only	all year
003	Phosphorus, total [as P]	MAXIMUM	report only	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	MAXIMUM	report only	all year
003	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
003	Flow, in conduit or thru treatment plant	MAXIMUM	report only	all year
003	Chlorine, total residual	AH	report only	all year
003	Chlorine, total residual	MAXIMUM	report only	all year
003	Coliform, fecal general	MAXIMUM	<= 400 #/100mL	May, Jun, Jul, Aug, Sep, Oct
003	Coliform, fecal general	MAXIMUM	<= 1000 #/100mL	Jan, Feb, Mar, Apr, Nov, Dec
003	BOD, carbonaceous [5 day, 20 C]	MAXIMUM	report only	all year
SLD	Solids, total	MO MIN	report only	all year
SLD	Solids, total	MO AVG	report only	all year
SLD	Solids, total	MO MAX	report only	all year
SLD	Arsenic, dry weight	MO MIN	report only	all year
SLD	Arsenic, dry weight	MO AVG	report only	all year
SLD	Arsenic, dry weight	MO MAX	<= 75 mg/kg	all year
SLD	Selenium, dry weight	MO MIN	report only	all year
SLD	Selenium, dry weight	MO AVG	report only	all year
SLD	Selenium, dry weight	MO MAX	<= 100 mg/kg	all year
SLD	Copper, dry weight	MO MIN	report only	all year
SLD	Copper, dry weight	MO AVG	report only	all year
SLD	Copper, dry weight	MO MAX	<= 4300 mg/kg	all year
SLD	Cadmium, dry weight	MO MIN	report only	all year
SLD	Cadmium, dry weight	MO AVG	report only	all year
SLD	Cadmium, dry weight	MO MAX	<= 85 mg/kg	all year
SLD	Nitrogen, total Kjeldahl	MO MIN	report only	all year
SLD	Nitrogen, total Kjeldahl	MO AVG	report only	all year
SLD	Nitrogen, total Kjeldahl	MO MAX	report only	all year
SLD	Molybdenum, sludge, total, dry weight [as Mo]	MO MIN	report only	all year
SLD	Molybdenum, sludge, total, dry weight [as Mo]	MO AVG	report only	all year
SLD	Molybdenum, sludge, total, dry weight [as Mo]	MO MAX	<= 75 mg/kg	all year
SLD	Zinc, sludge, total, dry weight [as Zn]	MO MIN	report only	all year
SLD	Zinc, sludge, total, dry weight [as Zn]	MO AVG	report only	all year
SLD	Zinc, sludge, total, dry weight [as Zn]	MO MAX	<= 7500 mg/kg	all year
SLD	Lead, sludge, total, dry weight [as Pb]	MO MIN	report only	all year
SLD	Lead, sludge, total, dry weight [as Pb]	MO AVG	report only	all year
SLD	Lead, sludge, total, dry weight [as Pb]	MO MAX	<= 840 mg/kg	all year
SLD	Nickel, sludge, total, dry weight [as Ni]	MO MIN	report only	all year
SLD	Nickel, sludge, total, dry weight [as Ni]	MO AVG	report only	all year
SLD	Nickel, sludge, total, dry weight [as Ni]	MO MAX	<= 420 mg/kg	all year
SLD	Nitrogen, sludge, total, dry weight [as N]	MO MIN	report only	all year
SLD	Nitrogen, sludge, total, dry weight [as N]	MO AVG	report only	all year
SLD	Nitrogen, sludge, total, dry weight [as N]	MO MAX	report only	all year
SLD	Mercury, sludge, total, dry weight [as Hg]	MO MIN	report only	all year
SLD	Mercury, sludge, total, dry weight [as Hg]	MO AVG	report only	all year
SLD	Mercury, sludge, total, dry weight [as Hg]	MO MAX	<= 57 mg/kg	all year
SLD	Potassium, sludge, total, dry weight [as K]	MO MIN	report only	all year
SLD	Potassium, sludge, total, dry weight [as K]	MO AVG	report only	all year
SLD	Potassium, sludge, total, dry weight [as K]	MO MAX	report only	all year
SLD	Phosphorus, sludge, total, dry weight [as P]	MO MIN	report only	all year
SLD	Phosphorus, sludge, total, dry weight [as P]	MO AVG	report only	all year
SLD	Phosphorus, sludge, total, dry weight [as P]	MO MAX	report only	all year