Spearfish, City of

NPDES permit SD0020044 · Major POTW · administratively continued, expires 2025-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2025-09-30 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 17 forms filed late

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

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 (129)

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
001Conductivity30DA AVG report only all year
001ConductivityDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN report only all year
001BOD, 5-day, 20 deg. C30DA AVG <= 10 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 17.5 mg/L all year
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 8.8 SU all year
001Alkalinity, total [as CaCO3]30DA AVG report only all year
001Alkalinity, total [as CaCO3]DAILY MX report only all year
001Solids, total suspended30DA AVG <= 10 mg/L all year
001Solids, total suspendedDAILY MX <= 17.5 mg/L all year
001Solids, total suspended30DA AVG report only all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]30DA AVG report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 3.5 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 3.1 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 3.1 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 3.3 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 2.5 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 2.1 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2.4 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 2.5 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 2.8 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 9.3 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 7.8 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 7.8 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 8.7 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 8.1 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 7.8 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 7.8 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 8.1 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 8.1 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 6.8 mg/L Dec
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
001Cyanide, weak acid, dissociableVALUE report only all year
001Cyanide, weak acid, dissociableVALUE report only all year
001Cyanide, total [as CN]VALUE report only all year
001Cyanide, total [as CN]VALUE report only all year
001Hardness, total [as CaCO3]VALUE report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total recoverableVALUE report only all year
001Arsenic, total recoverableVALUE report only all year
001Selenium, total recoverableVALUE report only all year
001Selenium, total recoverableVALUE report only all year
001Thallium, total recoverableVALUE report only all year
001Thallium, total recoverableVALUE report only all year
001Beryllium, total recoverable [as Be]VALUE report only all year
001Beryllium, total recoverable [as Be]VALUE report only all year
001Nickel, total recoverableVALUE report only all year
001Nickel, total recoverableVALUE report only all year
001Silver total recoverable30DA AVG report only all year
001Silver total recoverableDAILY MX <= 7.06 ug/L all year
001Silver total recoverableDAILY MX report only all year
001Zinc, total recoverableVALUE report only all year
001Zinc, total recoverableVALUE report only all year
001Aluminum, total recoverableVALUE report only all year
001Aluminum, total recoverableVALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Lead, total recoverable30DA AVG <= 5.16 ug/L all year
001Lead, total recoverableDAILY MX report only all year
001Lead, total recoverableDAILY MX report only all year
001Chromium, total recoverableVALUE report only all year
001Chromium, total recoverableVALUE report only all year
001Copper, total recoverableVALUE report only all year
001Copper, total recoverableVALUE report only all year
001Molybdenum, total recoverableVALUE report only all year
001Molybdenum, total recoverableVALUE report only all year
001Antimony, total recoverableVALUE report only all year
001Antimony, total recoverableVALUE report only all year
001PhenolsVALUE report only all year
001PhenolsVALUE 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
001Toxicity [acute], Ceriodaphnia dubiaDAILY MX < 1 toxic all year
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX < 1 tox chronic all year
001Toxicity [acute], Pimephales promelas [Fathead Minnow]DAILY MX < 1 toxic all year
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX < 1 tox chronic all year
001Mercury, total recoverable30DA AVG <= .77 ug/L all year
001Mercury, total recoverableDAILY MX <= 1.4 ug/L all year
001Mercury, total recoverableDAILY MX report only all year
001BOD, carbonaceous [5 day, 20 C]30DA AVG report only all year
001BOD, carbonaceous [5 day, 20 C]DAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Oil and grease visualDAILY MX <= 0 N=0;Y=1 all year
002Temperature, water deg. centigrade30DA AVG report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002Flow rate30DA AVG report only all year
002Flow rateDAILY MX report only all year
002Conductivity30DA AVG report only all year
002ConductivityDAILY MX report only all year
002pHDAILY MN report only all year
002pHDAILY MX report only all year
002Nitrogen, ammonia total [as N]30DA AVG report only all year
002Nitrogen, ammonia total [as N]DAILY MX report only all year
002Nitrogen, nitrite total [as N]30DA AVG report only all year
002Nitrogen, nitrite total [as N]DAILY MX report only all year
002Nitrogen, nitrate total [as N]30DA AVG report only all year
002Nitrogen, nitrate total [as N]DAILY MX report only all year
002Nitrogen, Kjeldahl, total [as N]30DA GM report only all year
002Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
002Phosphorus, total [as P]30DA AVG report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Sodium adsorption ratio30DA AVG report only all year
002Sodium adsorption ratioDAILY MX report only all year
002Chloride [as Cl]30DA AVG report only all year
002Chloride [as Cl]DAILY MX report only all year
002Sulfate, total [as SO4]30DA AVG report only all year
002Sulfate, total [as SO4]DAILY MX report only all year
002E. coli, colony forming units [CFU]30DA GEO report only all year
002E. coli, colony forming units [CFU]DAILY MX report only all year
002Flow, irrigationMO TOTAL report only all year
002Duration of Land ApplicationMX 7D AV report only all year
002Solids, total dissolved30DA AVG report only all year
002Solids, total dissolvedDAILY MX 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