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National Park Service

Federal facility (Sewerage Systems), Unknown, Wyoming. NPDES permit WY0023442 expired Sep 30, 2025; its limits still apply. Last 12 months: over a limit 2 times (last October 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (26 values), form QQ quarterly (1 value), form AA yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
15 values over a limit, 1 required value missing, 0 of 17 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average31.2 mg/L≤ 30 mg/L4%
October 2025pH, instantaneous minimum6.16 SU≥ 6.5 SU—

Limits in force (34)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily averagereport only (deg C)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximum≤ 208.5 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 90 mg/Lall year
Solids, total suspendeddaily maximum≤ 208.5 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ .5 mg/Lall year
Chlorine, total residualdaily maximum≤ 2.085 lb/dall year
E. colimonthly geometric mean≤ 126 MPN/100mLJun–Oct
E. colimonthly geometric mean≤ 630 MPN/100mLJan, Feb, Mar, Apr, May, Nov, Dec
E. colidaily maximum≤ 235 MPN/100mLJun–Oct
E. colidaily maximum≤ 630 MPN/100mLJan, Feb, Mar, Apr, May, Nov, Dec
Solids, total dissolved [TDS]daily maximumreport only (mg/L)all year
Flowmonthly average≤ .5 MGDall year
Flowdaily maximumreport only (MGD)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Jul–Sep
Solids, suspended percent removalmonthly average minimum≥ 85 %Jul–Sep
Produced water, oil and greasedaily maximumreport only (mg/L)all year

How strict are these limits?

Cited limits by parameter: Wyoming's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0023442 · MCP: https://passage-data.com/mcp