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Rawlins, City of

Sewage treatment plant, major discharger, Unknown, Wyoming. NPDES permit WY0020427 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MM monthly (20 values), outfall 001 form QQ quarterly (2 values), outfall 002 form MM monthly (21 values), outfall 002 form QQ quarterly (2 values), outfall 001 form MA yearly, outfall 001 form SS twice a year, and 2 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 38 reports late

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

Period endingParameterReportedLimitOver by
April 2026Solids, suspended percent removal, monthly average minimum75 %≥ 85 %67%
June 2026Solids, suspended percent removal, monthly average minimum71 %≥ 85 %93%

Limits in force (69)

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 maximum≤ 90 mg/Lall 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 averagereport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Solids, total suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 100 mg/Lall year001
Solids, total suspendedweekly average≤ 150 mg/Lall year001
Solids, total suspendeddaily maximum≤ 300 mg/Lall 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≤ .011 mg/Lall year001
E. colimonthly geometric mean≤ 126 CFU/100mLApr–Sep001
E. colidaily maximum≤ 630 CFU/100mLJan, Feb, Mar, Oct, Nov, Dec001
E. colidaily maximum≤ 576 CFU/100mLApr–Sep001
E. colimonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Oct, Nov, Dec001
Nitrogen, Ammonia Totaldaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowmonthly averagereport only (MGD)all year001
Flowdaily maximumreport only (MGD)all year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Produced water, oil and greasedaily maximumreport only (mg/L)all year001
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia48-hour maximum= 0 pass=0;fail=1all year001
Pass/Fail Static 96 Hr Acute Pimephales Promelas96-hour value= 0 pass=0;fail=1all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year002
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 90 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year002
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendedweekly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Solids, total suspendedmonthly average≤ 100 mg/Lall year002
Solids, total suspendedweekly average≤ 150 mg/Lall year002
Solids, total suspendeddaily maximum≤ 300 mg/Lall year002
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Durationmonthly totalreport only (d)all year002
Chlorine, total residualdaily maximum≤ .011 mg/Lall year002
E. colidaily maximum≤ 630 CFU/100mLJan, Feb, Mar, Oct, Nov, Dec002
E. colimonthly geometric mean≤ 126 CFU/100mLApr–Sep002
E. colimonthly geometric mean≤ 126 #/100mLApr–Sep002
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Oct, Nov, Dec002
E. colimonthly average≤ 630 CFU/100mLJan, Feb, Mar, Oct, Nov, Dec002
E. colidaily maximum≤ 576 CFU/100mLApr–Sep002
E. colidaily maximum≤ 576 #/100mLApr–Sep002
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Oct, Nov, Dec002
Nitrogen, Ammonia Totaldaily maximumreport only (mg/L)all year002
Solids, total dissolveddaily maximumreport only (mg/L)all year002
Flowmonthly averagereport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year002
Produced water, oil and greasedaily maximumreport only (mg/L)all year002
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia48-hour maximum= 0 pass=0;fail=1all year002
Pass/Fail Static 96 Hr Acute Pimephales Promelas96-hour value= 0 pass=0;fail=1all year002

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/WY0020427 · MCP: https://passage-data.com/mcp