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Byron, Town of

Sewage treatment plant, (Unknown City), Wyoming. NPDES permit WY0020281, in force until Mar 31, 2029. Last 12 months: over a limit 2 times (last May 2026), 21 required values missing, 8 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (42 values), form SS twice a year
Last report on file
June 2026
Oct 2024 – Sep 2025
36 values over a limit, 2 required values missing, 10 of 14 reports late

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

Period endingParameterReportedLimitOver by
May 2026E. coli, daily maximum2000 #/100mL≤ 576 #/100mL247%
May 2026E. coli, monthly geometric mean2000 #/100mL≤ 126 #/100mL1487%

Limits in force (47)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall 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. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all 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. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly 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
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedweekly average≤ 150 mg/Lall year
Solids, total suspendedweekly average≤ 150 mg/Lall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Durationmonthly totalreport only (d)all year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ 2 mg/Lall year
Chlorine, total residualdaily maximum≤ 2 mg/Lall year
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Oct, Nov, Dec
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Oct, Nov, Dec
E. colimonthly geometric mean≤ 126 #/100mLApr–Sep
E. colimonthly geometric mean≤ 126 #/100mLApr–Sep
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Oct, Nov, Dec
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Oct, Nov, Dec
E. colidaily maximum≤ 576 #/100mLApr–Sep
E. colidaily maximum≤ 576 #/100mLApr–Sep
Flowmonthly average≤ .177 MGDall year
Flowmonthly average≤ .177 MGDall year
Flowdaily maximumreport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall 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/WY0020281 · MCP: https://passage-data.com/mcp