National Park Service

NPDES permit WY0023442 · Minor FEDERAL · administratively continued, expires 2025-09-30 · 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 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

3values over a limit
0required values missing, on 0 form(s)
0of 15 forms filed late

Last period with anything received: 2026-06-30. Most often over: pH (2), Solids, total suspended (1).

Reporting

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

Limits in force (34)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY AV report only all year
001Oxygen, dissolved [DO]DAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 90 mg/L all year
001BOD, 5-day, 20 deg. CDAILY MX <= 208.5 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedDAILY MX <= 90 mg/L all year
001Solids, total suspendedDAILY MX <= 208.5 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedWKLY AVG report only all year
001Nitrogen, ammonia 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
001DurationMO TOTAL report only all year
001Chlorine, total residualDAILY MX <= .5 mg/L all year
001Chlorine, total residualDAILY MX <= 2.085 lb/d all year
001E. coliMO GEOMN <= 126 MPN/100mL Jun, Jul, Aug, Sep, Oct
001E. coliMO GEOMN <= 630 MPN/100mL Jan, Feb, Mar, Apr, May, Nov, Dec
001E. coliDAILY MX <= 235 MPN/100mL Jun, Jul, Aug, Sep, Oct
001E. coliDAILY MX <= 630 MPN/100mL Jan, Feb, Mar, Apr, May, Nov, Dec
001Solids, total dissolved [TDS]DAILY MX report only all year
001FlowMO AVG <= .5 MGD all year
001FlowDAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % Jul, Aug, Sep
001Solids, suspended percent removalMO AV MN >= 85 % Jul, Aug, Sep
001Produced water, oil and greaseDAILY 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