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Wydot

Sewage treatment plant, Buffalo, Wyoming. NPDES permit WY0043745, in force until Jun 30, 2031. Last 12 months: over a limit 9 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form AA yearly, outfall 001 form MQ quarterly, outfall 001 form QQ quarterly, outfall 002 form AA yearly, outfall 002 form MA yearly, outfall DMP1 form QQ quarterly
Last report on file
June 2026
Oct 2024 – Sep 2025
12 values over a limit, 1 required value missing, 0 of 34 reports late

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

Period endingParameterReportedLimitOver by
October 2025Solids, suspended percent removal, monthly average100 %< 85 %100%
November 2025Solids, suspended percent removal, monthly average100 %< 85 %100%
December 2025Solids, suspended percent removal, monthly average100 %< 85 %100%
January 2026Solids, suspended percent removal, monthly average100 %< 85 %100%
February 2026Solids, suspended percent removal, monthly average100 %< 85 %100%
March 2026Solids, suspended percent removal, monthly average100 %< 85 %100%
April 2026Solids, suspended percent removal, monthly average100 %< 85 %100%
May 2026Solids, suspended percent removal, monthly average100 %< 85 %100%
June 2026Solids, suspended percent removal, monthly average100 %< 85 %100%

Limits in force (52)

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. Cmonthly averagereport only (mg/L) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L) (alert, not enforceable)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 suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.75 mg/LMay–Sep001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Oct, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 17.2 mg/LMay–Sep001
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/mo)all year001
Chlorine, total residualmonthly average≤ 2.303 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Chlorine, total residualmonthly average≤ .086 mg/LMay–Sep001
Chlorine, total residualdaily maximum≤ 3.98 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Chlorine, total residualdaily maximum≤ .149 mg/LMay–Sep001
E. colimonthly geometric mean≤ 985 #/100mLMay–Sep001
E. colimonthly geometric mean≤ 131900 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily maximum≤ 4503 #/100mLMay–Sep001
E. colidaily maximum≤ 131900 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowmonthly average≤ .014 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
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 30 mg/Lall year002
Solids, total suspendedweekly average≤ 45 mg/Lall year002
Durationmonthly totalreport only (d/mo)all year002
Durationmonthly totalreport only (d/mo)all year002
E. colimonthly geometric mean≤ 126 #/100mLall year002
E. colidaily maximum≤ 630 #/100mLall year002
Flowmonthly averagereport only (MGD)all year002
Flowmonthly averagereport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearDMP1
pHinstantaneous minimum≥ 6.5 SUall yearDMP1
pHinstantaneous maximum≤ 9 SUall 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/WY0043745 · MCP: https://passage-data.com/mcp