Marion, City of

NPDES permit SD0020311 · Minor POTW · effective, expires 2031-01-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

2values over a limit
51required values missing, on 3 form(s)
9of 11 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 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (40)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheit30DA AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001Flow rate30DA AVG report only all year
001Flow rateDAILY MX report only all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CMX 7D AV <= 45 mg/L all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspended30DA AVG <= 90 mg/L all year
001Solids, total suspendedMX 7D AV <= 135 mg/L all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 3.6 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 5.5 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 3.8 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 2.2 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 2.9 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 12.1 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 14.7 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 7 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 5.2 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 4.4 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 2.4 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 2.5 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 2.8 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 4.1 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 5.1 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 8.4 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 12.1 mg/L Dec
001Phosphorus, total [as P]DAILY MX report only all year
001E. coli, colony forming units [CFU]30DA GEO <= 630 #/100mL May, Jun, Jul, Aug, Sep
001E. coli, colony forming units [CFU]DAILY MX <= 1178 #/100mL May, Jun, Jul, Aug, Sep
001Flow, totalMO TOTAL report only all year
001Duration of dischargeMO TOTAL 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