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Dubois, Town of

Sewage treatment plant, (Unknown City), Wyoming. NPDES permit WY0020834, in force until Mar 31, 2029. Last 12 months: over a limit 6 times (last May 2026), 11 required values missing, 4 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (20 values), form QQ quarterly (5 values)
Last report on file
June 2026
Oct 2024 – Sep 2025
10 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, monthly average47 mg/L≤ 30 mg/L57%
April 2026BOD, 5-day, 20 deg. C, weekly average47 mg/L≤ 45 mg/L4%
April 2026BOD, 5-day, percent removal, monthly average minimum64 %≥ 85 %140%
April 2026Solids, total suspended, monthly average136 mg/L≤ 100 mg/L36%
May 2026BOD, 5-day, 20 deg. C, monthly average42 mg/L≤ 30 mg/L40%
May 2026BOD, 5-day, percent removal, monthly average minimum74 %≥ 85 %73%

Limits in force (28)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)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 maximumreport only (mg/L)all 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≤ 100 mg/Lall year
Solids, total suspendedweekly average≤ 150 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport 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
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ 1.23 mg/LMay–Sep
Chlorine, total residualdaily maximum≤ 1 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colimonthly geometric mean≤ 55713 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colimonthly geometric mean≤ 11919 #/100mLMay–Sep
E. colidaily maximum≤ 55713 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 24156 #/100mLMay–Sep
Flowmonthly average≤ .4 MGDall year
Flowdaily maximumreport only (MGD)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall 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/WY0020834 · MCP: https://passage-data.com/mcp