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City of Green River

Sewage treatment plant, major discharger, Green River, Wyoming. NPDES permit WY0020443, in force until Jun 30, 2031. Last 12 months: over a limit once (last January 2026), 7 required values missing, 5 of 26 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MM monthly (26 values), outfall CRS1 form MM monthly (1 value), outfall 001 form AA yearly, outfall 001 form AW quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 2 required values missing, 3 of 29 reports late

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

Period endingParameterReportedLimitOver by
January 2026Solids, total suspended, weekly average90 mg/L≤ 45 mg/L100%

Limits in force (41)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendeddaily maximumreport only (mg/L)all 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
Nitrogen, ammonia total [as N]monthly average≤ 29.04 mg/LMay–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 32.59 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Phosphate, ortho [as P]daily maximumreport only (mg/L)all year001
Durationmonthly totalreport only (d)all year001
Chlorine, total residualdaily maximum≤ .47 mg/LMay–Sep001
Chlorine, total residualdaily maximum≤ .33 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
Chlorine, total residualmonthly average≤ .27 mg/LMay–Sep001
Chlorine, total residualmonthly average≤ .19 mg/LJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colimonthly geometric mean≤ 739 #/100mLMay–Sep001
E. colimonthly geometric mean≤ 9312 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily maximum≤ 3420 #/100mLMay–Sep001
E. colidaily maximum≤ 9312 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolvedannual average≤ 400 mg/Lall year001
Flowmonthly average≤ 2.2 MGDall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]weekly averagereport only (mg/L)all year001
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Produced water, oil and greasedaily maximum≤ 10 mg/Lall 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
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia48-hour maximum≤ 0 pass=0;fail=1all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas96-hour value≤ 0 pass=0;fail=1all year001
Solids, total dissolveddaily maximumreport only (mg/L)all yearCRS1

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/WY0020443 · MCP: https://passage-data.com/mcp