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Ten Sleep, Town of

Sewage treatment plant, Unknown, Wyoming. NPDES permit WY0020168 expired Mar 31, 2025; its limits still apply. Last 12 months: over a limit once (last April 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MQ quarterly (22 values), outfall DMP1 form QQ quarterly (2 values), outfall 001 form AA yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 1 of 25 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, monthly average40 mg/L≤ 30 mg/L33%

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 100 mg/Lall year001
Solids, total suspendedweekly average≤ 150 mg/Lall year001
Solids, total suspendeddaily maximum≤ 300 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 114.4 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 53.6 mg/Lall year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Durationmonthly totalreport only (d)all year001
Chlorine, total residualdaily maximum≤ .44 mg/LMay–Oct001
Chlorine, total residualdaily maximum≤ .39 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Chlorine, total residualmonthly average≤ .25 mg/LMay–Oct001
Chlorine, total residualmonthly average≤ .23 mg/LJan, Feb, Mar, Apr, Nov, Dec001
E. colimonthly geometric mean≤ 12062 MPN/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. colimonthly geometric mean≤ 1795 MPN/100mLMay–Oct001
E. colidaily maximum≤ 12062 MPN/100mLJan, Feb, Mar, Apr, Nov, Dec001
E. colidaily maximum≤ 5746 MPN/100mLMay–Oct001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowdaily maximum≤ .2 MGDall year001
Flowmonthly averagereport only (MGD)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Produced water, oil and greasedaily maximumreport only (mg/L)all year001
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearDMP1
pHinstantaneous maximumreport only (SU)all yearDMP1

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/WY0020168 · MCP: https://passage-data.com/mcp