Rapid City, City of

NPDES permit SD0023574 · Major POTW · administratively continued, expires 2022-06-30 · 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 2022-06-30 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)
1of 33 forms filed late

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

Reporting

Reports are due about 89 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (103)

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
001Flow rate30DA AVG report only all year
001Flow rateDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN >= 5 mg/L Jan, Feb, Mar, Apr, Dec
001Oxygen, dissolved [DO]DAILY MN >= 6.5 mg/L May, Jun, Jul, Aug, Sep
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L Oct, Nov
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, 5-day, 20 deg. C30DA AVG <= 24 mg/L May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C30DA AVG <= 28 mg/L Oct, Nov
001BOD, 5-day, 20 deg. CMX 7D AV <= 30 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, 5-day, 20 deg. CMX 7D AV <= 24 mg/L May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. CMX 7D AV <= 28 mg/L Oct, Nov
001BOD, 5-day, 20 deg. C30DA AVG report only all year
001pHDAILY MN >= 6.5 SU all year
001pHDAILY MX <= 8.3 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L all year
001Solids, total suspendedMX 7D AV <= 45 mg/L all year
001Solids, total suspended30DA AVG report only all year
001Oil & GreaseDAILY MX <= 10 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
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]VALUE 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 recoverableVALUE report only all year
001Silver total recoverableVALUE report only all year
001Zinc, total recoverableVALUE report only all year
001Zinc, total recoverableVALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Cadmium, total recoverableVALUE report only all year
001Lead, total recoverableVALUE report only all year
001Lead, total recoverableVALUE 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 <= 126 #/100mL May, Jun, Jul, Aug, Sep
001E. coli, colony forming units [CFU]DAILY MX <= 235 #/100mL May, Jun, Jul, Aug, Sep
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 2 tox chronic Jan
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.2 tox chronic Oct
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.9 tox chronic Nov
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 2.2 tox chronic Dec
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 2.3 tox chronic Feb
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 2.4 tox chronic Mar
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.8 tox chronic Apr
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.4 tox chronic May
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.3 tox chronic Jun
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.3 tox chronic Jul
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.2 tox chronic Aug
001Toxicity [chronic], Ceriodaphnia dubiaDAILY MX <= 1.2 tox chronic Sep
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 2 tox chronic Jan
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.2 tox chronic Oct
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.9 tox chronic Nov
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 2.2 tox chronic Dec
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 2.3 tox chronic Feb
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 2.4 tox chronic Mar
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.8 tox chronic Apr
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.4 tox chronic May
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.3 tox chronic Jun
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.3 tox chronic Jul
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.2 tox chronic Aug
001Toxicity [chronic], Pimephales promelas [Fathead Minnow]DAILY MX <= 1.2 tox chronic Sep
001Mercury, total recoverableVALUE report only all year
001Mercury, total recoverableVALUE 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
001Report due [yrmoda]DAILY MX report only all year
001Report due [yrmoda]DAILY MX report only all year
001Report due [yrmoda]DAILY MX report only all year
001Report due [yrmoda]DAILY MX report only all year
001Report due [yrmoda]DAILY MX report only all year
001Report due [yrmoda]DAILY 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