Custer, City of

NPDES permit SD0023281 · Minor POTW · administratively continued, expires 2026-03-31 · 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.

This permit expired on 2026-03-31 and is administratively continued: 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

0values over a limit
0required values missing, on 0 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among SD permits in EPA's filings — check your permit).

Limits in force (76)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigrade30DA AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Flow rate30DA AVG report only all year
001Flow rateDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN 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 <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, nitrate total [as N]30DA AVG report only all year
001Nitrogen, nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]30DA AVG report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001E. coli, colony forming units [CFU]30DA GEO report only May, Jun, Jul, Aug, Sep
001E. coli, colony forming units [CFU]DAILY MX report only May, Jun, Jul, Aug, Sep
002Temperature, water deg. centigradeVALUE report only all year
002Flow rateVALUE report only all year
002ConductivityVALUE report only all year
002BOD, 5-day, 20 deg. CVALUE report only all year
002pHDAILY MN report only all year
002pHDAILY MX report only all year
002Solids, total suspendedVALUE report only all year
002Nitrogen, total [as N]VALUE report only all year
002Nitrogen, ammonia total [as N]VALUE report only all year
002Nitrogen, nitrite total [as N]VALUE report only all year
002Nitrogen, nitrate total [as N]VALUE report only all year
002Nitrogen, Kjeldahl, total [as N]VALUE report only all year
002Phosphorus, total [as P]VALUE report only all year
002Sodium adsorption ratioVALUE report only all year
002Chloride [as Cl]VALUE report only all year
002Sulfate, total [as SO4]VALUE report only all year
002E. coli, colony forming units [CFU]DAILY MX <= 126 #/100mL all year
002Flow, totalVALUE report only all year
002Duration of Land ApplicationMO TOTAL report only all year
002Solids, total dissolvedVALUE report only all year
004Temperature, water deg. centigrade30DA AVG report only all year
004Temperature, water deg. centigradeDAILY MX report only all year
004Flow rate30DA AVG report only all year
004Flow rateDAILY MX report only all year
004Oxygen, dissolved [DO]DAILY MN report only all year
004BOD, 5-day, 20 deg. C30DA AVG <= 10 mg/L all year
004BOD, 5-day, 20 deg. CDAILY MX <= 17.5 mg/L all year
004pHDAILY MN >= 6.5 SU all year
004pHDAILY MX <= 9 SU all year
004Solids, total suspended30DA AVG <= 10 mg/L all year
004Solids, total suspendedDAILY MX <= 17.5 mg/L all year
004Nitrogen, total [as N]30DA AVG report only all year
004Nitrogen, total [as N]DAILY MX report only all year
004Nitrogen, ammonia total [as N]30DA AVG <= 2.2 mg/L Jan, Feb
004Nitrogen, ammonia total [as N]30DA AVG <= 2.4 mg/L Mar
004Nitrogen, ammonia total [as N]30DA AVG <= 2.9 mg/L Apr
004Nitrogen, ammonia total [as N]30DA AVG <= 1.4 mg/L May, Jun
004Nitrogen, ammonia total [as N]30DA AVG <= 1 mg/L Jul, Aug
004Nitrogen, ammonia total [as N]30DA AVG <= 1.6 mg/L Sep
004Nitrogen, ammonia total [as N]30DA AVG <= 2 mg/L Oct
004Nitrogen, ammonia total [as N]30DA AVG <= 2.1 mg/L Nov, Dec
004Nitrogen, ammonia total [as N]DAILY MX <= 4.9 mg/L Jan, Feb
004Nitrogen, ammonia total [as N]DAILY MX <= 5 mg/L Mar
004Nitrogen, ammonia total [as N]DAILY MX <= 6 mg/L Apr
004Nitrogen, ammonia total [as N]DAILY MX <= 3.5 mg/L May, Jun
004Nitrogen, ammonia total [as N]DAILY MX <= 3.1 mg/L Jul, Aug
004Nitrogen, ammonia total [as N]DAILY MX <= 3.3 mg/L Sep
004Nitrogen, ammonia total [as N]DAILY MX <= 4.1 mg/L Oct
004Nitrogen, ammonia total [as N]DAILY MX <= 4.5 mg/L Nov, Dec
004Nitrogen, nitrate total [as N]30DA AVG report only all year
004Nitrogen, nitrate total [as N]DAILY MX report only all year
004Phosphorus, total [as P]30DA AVG report only all year
004Phosphorus, total [as P]DAILY MX report only all year
004E. coli, colony forming units [CFU]30DA GEO <= 259 #/100mL May, Jun, Jul, Aug, Sep
004E. coli, colony forming units [CFU]DAILY MX <= 1178 #/100mL May, Jun, Jul, Aug, Sep

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