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Powell, City of

Sewage treatment plant, major discharger, Powell, Wyoming. NPDES permit WY0020648, in force until Apr 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MM monthly (23 values), outfall 001 form QQ yearly (2 values), outfall UMP1 form QQ quarterly (4 values), outfall 001 form MA yearly
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 0 of 21 reports late

Limits in force (79)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Temperature, water deg. centigrademonthly averagereport 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 maximumreport only (mg/L)all 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 maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 1.16 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 1.13 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 1.26 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 1.21 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 1.16 mg/LJan001
Nitrogen, ammonia total [as N]monthly average≤ 1.32 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 2.14 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ .98 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 1.94 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 1.65 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 1.21 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LNov001
Nitrogen, ammonia total [as N]daily maximum≤ 3.17 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 2.4 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 2.66 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum≤ 3.85 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum≤ 2.37 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 5.72 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 4.54 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 2.07 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 5.31 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 6.12 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 2.56 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 3.39 mg/LNov001
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≤ .011 mg/Lall year001
E. colimonthly geometric mean≤ 126 #/100mLMay–Sep001
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily maximum≤ 235 #/100mLMay–Sep001
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowmonthly average≤ 1.5 MGDNov001
Flowmonthly average≤ 4.9 MGDJun001
Flowmonthly average≤ 4.9 MGDSep001
Flowmonthly average≤ 4.9 MGDAug001
Flowmonthly average≤ 1.5 MGDOct001
Flowmonthly average≤ 1.5 MGDMar001
Flowmonthly average≤ 1.5 MGDJan001
Flowmonthly average≤ 4.9 gal/dApr001
Flowmonthly average≤ 4.9 MGDMay001
Flowmonthly average≤ 4.9 MGDJul001
Flowmonthly average≤ 1.5 MGDFeb001
Flowmonthly average≤ 1.5 MGDDec001
Flowdaily maximumreport only (MGD)Nov001
Flowdaily maximumreport only (MGD)Jun001
Flowdaily maximumreport only (MGD)Sep001
Flowdaily maximumreport only (MGD)Aug001
Flowdaily maximumreport only (MGD)Oct001
Flowdaily maximumreport only (MGD)Mar001
Flowdaily maximumreport only (MGD)Jan001
Flowdaily maximumreport only (gal/d)Apr001
Flowdaily maximumreport only (MGD)May001
Flowdaily maximumreport only (MGD)Jul001
Flowdaily maximumreport only (MGD)Feb001
Flowdaily maximumreport only (MGD)Dec001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day maximum≤ 0 pass=0;fail=1all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day maximum≤ 0 pass=0;fail=1all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearUMP1
pHinstantaneous minimumreport only (SU)all yearUMP1
pHinstantaneous maximumreport only (SU)all yearUMP1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all yearUMP1

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/WY0020648 · MCP: https://passage-data.com/mcp