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Glenrock, Town of

Sewage treatment plant, Glenrock, Wyoming. NPDES permit WY0020630, in force until Jun 30, 2030. Last 12 months: over a limit 12 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ monthly (21 values), form AA yearly, form QQ quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
13 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, monthly average66 mg/L≤ 30 mg/L120%
December 2025BOD, 5-day, 20 deg. C, weekly average66 mg/L≤ 45 mg/L47%
January 2026BOD, 5-day, 20 deg. C, monthly average40 mg/L≤ 30 mg/L33%
March 2026BOD, 5-day, 20 deg. C, monthly average65 mg/L≤ 30 mg/L117%
March 2026BOD, 5-day, 20 deg. C, weekly average65 mg/L≤ 45 mg/L44%
April 2026BOD, 5-day, 20 deg. C, monthly average42 mg/L≤ 30 mg/L40%
May 2026BOD, 5-day, 20 deg. C, monthly average51 mg/L≤ 30 mg/L70%
May 2026BOD, 5-day, 20 deg. C, weekly average51 mg/L≤ 45 mg/L13%
June 2026BOD, 5-day, 20 deg. C, monthly average71 mg/L≤ 30 mg/L137%
June 2026BOD, 5-day, 20 deg. C, weekly average71 mg/L≤ 45 mg/L58%
June 2026BOD, 5-day, percent removal, monthly average minimum64.5 %≥ 65 %1%
June 2026Flow, monthly average.883 MGD≤ .402 MGD120%

Limits in force (33)

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 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
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport 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
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 residualmonthly average≤ 1.55 mg/LMay–Sep
Chlorine, total residualmonthly average≤ 1.66 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
Chlorine, total residualdaily maximum≤ 2.68 mg/LMay–Sep
Chlorine, total residualdaily maximum≤ 2.86 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 91348 MPN/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colimonthly average≤ 11612 MPN/100mLMay–Oct
E. colimonthly average≤ 91348 MPN/100mLJan, Feb, Mar, Apr, Nov, Dec
E. colidaily maximum≤ 35876 MPN/100mLMay–Oct
Solids, total dissolved [TDS]daily maximumreport only (mg/L)all year
Flowmonthly average≤ .402 MGDall year
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year
Solids, suspended 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/WY0020630 · MCP: https://passage-data.com/mcp