Watertown city of — NPDES permit MN0020940: limits, due date and EPA's record

NPDES permit MN0020940 · Minor POTW · expired, expires 2024-04-30 · EPA's file as of 2026-09-19

This permit expired on 2024-04-30 and is expired: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

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

Reporting

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

Limits in force (55)

Outfall	Parameter	Statistic	Limit	Months
D007	Specific conductance	MO MAX	report only	all year
D007	Oxygen, dissolved [DO]	MO MIN	report only	all year
D007	pH	MO MIN	>= 6 SU	all year
D007	pH	MO MAX	<= 9 SU	all year
D007	Bicarbonate ion- [as HCO3]	MO MAX	report only	all year
D007	Solids, total suspended	MO AVG	<= 30 mg/L	all year
D007	Solids, total suspended	MX WK AV	<= 45 mg/L	all year
D007	Solids, total suspended	MO MAX	report only	Jan, Jul
D007	Solids, total suspended	MO AVG	<= 143 kg/d	all year
D007	Solids, total suspended	MX WK AV	<= 214 kg/d	all year
D007	Nitrogen, total [as N]	MO AVG	report only	all year
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 24 mg/L	Apr, May
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 1.4 mg/L	Jun, Jul, Aug, Sep
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 5.1 mg/L	Oct, Nov
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 7.7 mg/L	Jan, Feb, Mar, Dec
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 114.5 kg/d	Apr, May
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 6.7 kg/d	Jun, Jul, Aug, Sep
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 24.3 kg/d	Oct, Nov
D007	Nitrogen, ammonia total [as N]	MO AVG	<= 36.7 kg/d	Jan, Feb, Mar, Dec
D007	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
D007	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
D007	Phosphorus, total [as P]	MO AVG	report only	all year
D007	Phosphorus, total [as P]	MO AVG	report only	all year
D007	Calcium, total [as Ca]	MO MAX	report only	all year
D007	Magnesium, total [as Mg]	MO MAX	report only	all year
D007	Sodium, total [as Na]	MO MAX	report only	all year
D007	Potassium, total [as K]	MO MAX	report only	all year
D007	Chloride [as Cl]	DAILY MX	<= 660 mg/L	all year
D007	Sulfate, total [as SO4]	MO MAX	report only	all year
D007	Hardness, Ca Mg Calculated [mg/L as CaCO3]	MO MAX	report only	all year
D007	Coliform, fecal MPN + membrane ftl 44.5 C	MO GEOMN	<= 200 #/100mL	Apr, May, Jun, Jul, Aug, Sep, Oct
D007	Flow, in conduit or thru treatment plant	MO AVG	report only	all year
D007	Flow, in conduit or thru treatment plant	MO MAX	report only	all year
D007	Flow, in conduit or thru treatment plant	MO TOTAL	report only	all year
D007	Chlorine, total residual	DAILY MX	<= .038 mg/L	all year
D007	Solids, total dissolved	MO MAX	report only	all year
D007	Mercury, dissolved [as Hg]	MO MAX	report only	Jan, Jul
D007	Mercury, total [as Hg]	MO MAX	report only	Jan, Jul
D007	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 5 mg/L	all year
D007	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 10 mg/L	all year
D007	BOD, carbonaceous [5 day, 20 C]	MO AVG	<= 23.9 kg/d	all year
D007	BOD, carbonaceous [5 day, 20 C]	MX WK AV	<= 47.7 kg/d	all year
D007	BOD, carb-5 day, 20 deg C, percent removal	MO AV MN	>= 85 %	all year
D007	Solids, suspended percent removal	MO AV MN	>= 85 %	all year
S008	Precipitation, total defined period/in	MO TOTAL	report only	all year
S008	pH	MO MIN	report only	all year
S008	pH	MO MAX	report only	all year
S008	Solids, total suspended	MO AVG	report only	all year
S008	Solids, total suspended	MO MAX	report only	all year
S008	Nitrogen, total [as N]	MO AVG	report only	all year
S008	Nitrogen, Kjeldahl, total [as N]	MO AVG	report only	all year
S008	Nitrite + Nitrate total [as N]	MO AVG	report only	all year
S008	Phosphorus, total [as P]	MO AVG	report only	all year
S008	BOD, carbonaceous [5 day, 20 C]	MO AVG	report only	all year
S008	BOD, carbonaceous [5 day, 20 C]	MO MAX	report only	all year