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Dayton, Town of

Sewerage Systems, Dayton, Wyoming. NPDES permit WY0020435, in force until Dec 31, 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 MQ quarterly (24 values), outfall 002 form MQ quarterly (2 values), outfall 002 form QQ quarterly (7 values), outfall 001 form MA yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 29 reports late

Limits in force (42)

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 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
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Solids, total suspendedmonthly averagereport 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≤ 1.91 mg/LMay–Sep001
Chlorine, total residualdaily maximum≤ 1.51 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Chlorine, total residualmonthly average≤ 1.1 mg/LMay–Sep001
Chlorine, total residualmonthly average≤ .88 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colimonthly geometric mean≤ 126 #/100mLMay–Sep001
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily maximum≤ 298 #/100mLMay–Sep001
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowmonthly average≤ .3 MGDall year001
Flowdaily maximumreport only (MGD)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
pHinstantaneous minimumreport only (SU)all year002
pHinstantaneous maximumreport only (SU)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Chlorine, total residualdaily maximumreport only (mg/L)all year002
E. colidaily maximumreport only (#/100mL)all year002
E. colimonthly geometric meanreport only (#/100mL)all year002
Flowmonthly averagereport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002

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/WY0020435 · MCP: https://passage-data.com/mcp