USNPS - Mt. Rushmore National Memorial

NPDES permit SD0021610 · Minor FEDERAL · administratively continued, expires 2023-06-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2023-06-30 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

1values over a limit
0required values missing, on 0 form(s)
0of 11 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (1).

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 (53)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX <= 24 deg C all year
001Temperature, water deg. centigradeMX 7D AV report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeMX 7D AV 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
001ConductivityDAILY MX report only all year
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L Apr, May, Jun, Jul, Aug, Sep
001Oxygen, dissolved [DO]DAILY MN >= 7 mg/L Jan, Feb, Mar, Oct, Nov, Dec
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 >= 6.6 SU all year
001pHDAILY MX <= 8.6 SU 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
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 1.3 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 2.2 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 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 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 1.2 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 1.2 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 2.2 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 2.2 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 4.8 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 4.6 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 1.7 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 1.7 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 1.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 1.7 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 1.7 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 3 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 3.1 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 2.2 mg/L Dec
001Phosphorus, total [as P]DAILY MX report only all year
001Arsenic, total recoverableDAILY MX 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
001Solids, total dissolvedDAILY 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 abst=0;prst=1 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