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Basin, Town of

Sewage treatment plant, Unknown, Wyoming. NPDES permit WY0020028, in force until Dec 31, 2026. Last 12 months: over a limit 8 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MM monthly (19 values), form QM quarterly (4 values), form MA yearly
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
11 values over a limit, 3 required values missing, 1 of 25 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, daily maximum1990 #/100mL≤ 630 #/100mL216%
February 2026BOD, 5-day, 20 deg. C, monthly average54 mg/L≤ 30 mg/L80%
February 2026BOD, 5-day, 20 deg. C, weekly average54 mg/L≤ 45 mg/L20%
February 2026BOD, 5-day, percent removal, monthly average minimum59.1 %≥ 65 %17%
February 2026E. coli, daily maximum155000 #/100mL≤ 630 #/100mL24503%
February 2026E. coli, geometric mean64215 #/100mL≤ 630 #/100mL10093%
March 2026E. coli, daily maximum4480 #/100mL≤ 630 #/100mL611%
May 2026E. coli, daily maximum435 MPN/100mL≤ 235 MPN/100mL85%

Limits in force (35)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)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 maximum≤ 90 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
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedweekly average≤ 150 mg/Lall year
Solids, total suspendeddaily maximum≤ 300 mg/Lall 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
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ 1.31 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Chlorine, total residualmonthly average≤ 1.125 mg/LMay–Sep
Chlorine, total residualmonthly average≤ 1.38 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Chlorine, total residualdaily maximum≤ .99 mg/LMay–Sep
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. coligeometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. coligeometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 235 MPN/100mLMay–Sep
E. colidaily maximum≤ 235 MPN/100mLMay–Sep
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Solids, total dissolveddaily maximumreport only (mg/L)all year
Flowmonthly average≤ 2.4 MGDall year
Flowdaily maximumreport only (MGD)all year
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year
Produced water, oil and greasedaily maximumreport only (mg/L)all 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/WY0020028 · MCP: https://passage-data.com/mcp