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Powder Horn Ranch, LLC

Sewerage Systems, Sheridan, Wyoming. NPDES permit WY0036251 expired Mar 31, 2026; its limits still apply. Last 12 months: no values over a limit, 1 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MM monthly (21 values), outfall 001 form QM quarterly (3 values), outfall 001 form MA yearly, outfall DMP1 form SS twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 27 reports late

Limits in force (31)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeinstantaneous 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≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximum≤ 90 mg/Lall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all 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≤ 2 mg/Lall year001
E. colidaily maximum≤ 630 MPN/100mLApr–Sep001
E. colimonthly average≤ 630 MPN/100mLApr–Sep001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowmonthly average≤ .098 MGDall year001
Flowdaily maximumreport only (MGD)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Produced water, oil and greasedaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearDMP1
Chlorine, total residualdaily maximumreport only (mg/L)all yearDMP1

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0036251 · MCP: https://passage-data.com/mcp