THE UNITED STATES DEPARTMENT OF INTERIOR NATIONAL PARK SERVICE

NPDES permit CO0034398 · Minor FEDERAL · administratively continued, expires 2024-06-30 · 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 2024-06-30 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)
0of 28 forms filed late

Last period with anything received: 2026-06-30.

Reporting

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

Limits in force (196)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
001BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001pHMINIMUM >= 6.5 SU all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspended30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
001Solids, total suspended30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
001Solids, total suspended30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Solids, total suspended30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Solids, total suspended7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
001Solids, total suspended7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
001Solids, total suspended7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Solids, total suspended7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Oil & GreaseDAILY MX <= 10 mg/L all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]30DA AVG <= 5.1 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 5.1 mg/L Jan
001Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Nov
001Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Dec
001Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Feb
001Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Mar
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Apr
001Nitrogen, ammonia total [as N]30DA AVG <= 2.4 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 2.4 mg/L May
001Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L Jun
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Jul
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Aug
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Sep
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Oct
001Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Jan
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Nov
001Nitrogen, ammonia total [as N]DAILY MX <= 8.9 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 8.9 mg/L Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Feb
001Nitrogen, ammonia total [as N]DAILY MX <= 7.3 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 7.3 mg/L Mar
001Nitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L Apr
001Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L May
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun
001Nitrogen, ammonia total [as N]DAILY MX <= 9.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 9.7 mg/L Jul
001Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L Aug
001Nitrogen, ammonia total [as N]DAILY MX <= 8.7 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 8.7 mg/L Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Oct
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Phosphorus, total [as P]DAILY MX report only all year
001Floating solids, waste or visible foam-visualINST MAX report only all year
001Floating solids, waste or visible foam-visualINST MAX report only all year
001Chlorine, total residual30DA AVG <= .011 mg/L all year
001Chlorine, total residual30DA AVG <= .011 mg/L all year
001Chlorine, total residualDAILY MX <= .019 mg/L all year
001Chlorine, total residualDAILY MX <= .019 mg/L all year
001E. coli30DA AVG <= 126 #/100mL all year
001E. coli30DA AVG <= 126 #/100mL all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX <= 400 mg/L all year
001Solids, total dissolvedDAILY MX <= 400 mg/L all year
001Flow30DA AVG <= .085 MGD all year
001Flow30DA AVG <= .085 MGD all year
001Oil and grease visualINST MAX report only all year
001Oil and grease visualINST MAX report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002BOD, 5-day, 20 deg. C30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
002BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
002BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002BOD, 5-day, 20 deg. C7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002pHMINIMUM >= 6.5 SU all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 9 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspended30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
002Solids, total suspended30DA AVG <= 30 mg/L Apr, May, Jun, Jul, Aug, Sep
002Solids, total suspended30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002Solids, total suspended30DA AVG <= 30 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002Solids, total suspended7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
002Solids, total suspended7 DA AVG <= 45 mg/L Apr, May, Jun, Jul, Aug, Sep
002Solids, total suspended7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002Solids, total suspended7 DA AVG <= 45 mg/L Jan, Feb, Mar, Oct, Nov, Dec
002Oil & GreaseDAILY MX <= 10 mg/L all year
002Oil & GreaseDAILY MX <= 10 mg/L all year
002Nitrogen, total [as N]DAILY MX report only all year
002Nitrogen, total [as N]DAILY MX report only all year
002Nitrogen, ammonia total [as N]30DA AVG <= 5.1 mg/L Jan
002Nitrogen, ammonia total [as N]30DA AVG <= 5.1 mg/L Jan
002Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Nov
002Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Nov
002Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Dec
002Nitrogen, ammonia total [as N]30DA AVG <= 3.7 mg/L Dec
002Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Feb
002Nitrogen, ammonia total [as N]30DA AVG <= 4.7 mg/L Feb
002Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Mar
002Nitrogen, ammonia total [as N]30DA AVG <= 3.2 mg/L Mar
002Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Apr
002Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Apr
002Nitrogen, ammonia total [as N]30DA AVG <= 2.4 mg/L May
002Nitrogen, ammonia total [as N]30DA AVG <= 2.4 mg/L May
002Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L Jun
002Nitrogen, ammonia total [as N]30DA AVG <= 3 mg/L Jun
002Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Jul
002Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Jul
002Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Aug
002Nitrogen, ammonia total [as N]30DA AVG <= 1.9 mg/L Aug
002Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Sep
002Nitrogen, ammonia total [as N]30DA AVG <= 2.3 mg/L Sep
002Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Oct
002Nitrogen, ammonia total [as N]30DA AVG <= 3.4 mg/L Oct
002Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Jan
002Nitrogen, ammonia total [as N]DAILY MX <= 13 mg/L Jan
002Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Nov
002Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Nov
002Nitrogen, ammonia total [as N]DAILY MX <= 8.9 mg/L Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 8.9 mg/L Dec
002Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Feb
002Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Feb
002Nitrogen, ammonia total [as N]DAILY MX <= 7.3 mg/L Mar
002Nitrogen, ammonia total [as N]DAILY MX <= 7.3 mg/L Mar
002Nitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L Apr
002Nitrogen, ammonia total [as N]DAILY MX <= 6.1 mg/L Apr
002Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L May
002Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L May
002Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun
002Nitrogen, ammonia total [as N]DAILY MX <= 10 mg/L Jun
002Nitrogen, ammonia total [as N]DAILY MX <= 9.7 mg/L Jul
002Nitrogen, ammonia total [as N]DAILY MX <= 9.7 mg/L Jul
002Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L Aug
002Nitrogen, ammonia total [as N]DAILY MX <= 7.9 mg/L Aug
002Nitrogen, ammonia total [as N]DAILY MX <= 8.7 mg/L Sep
002Nitrogen, ammonia total [as N]DAILY MX <= 8.7 mg/L Sep
002Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Oct
002Nitrogen, ammonia total [as N]DAILY MX <= 11 mg/L Oct
002Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
002Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
002Nitrite + Nitrate total [as N]DAILY MX report only all year
002Nitrite + Nitrate total [as N]DAILY MX report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Floating solids, waste or visible foam-visualINST MAX report only all year
002Floating solids, waste or visible foam-visualINST MAX report only all year
002Chlorine, total residual30DA AVG <= .011 mg/L all year
002Chlorine, total residual30DA AVG <= .011 mg/L all year
002Chlorine, total residualDAILY MX <= .019 mg/L all year
002Chlorine, total residualDAILY MX <= .019 mg/L all year
002E. coli30DA AVG <= 126 #/100mL all year
002E. coli30DA AVG <= 126 #/100mL all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolvedDAILY MX <= 400 mg/L all year
002Solids, total dissolvedDAILY MX <= 400 mg/L all year
002Flow30DA AVG <= .05 MGD all year
002Flow30DA AVG <= .05 MGD all year
002Oil and grease visualINST MAX report only all year
002Oil and grease visualINST MAX 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