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Cheyenne Board of Public Utilities

Sewage treatment plant, major discharger, Cheyenne, Wyoming. NPDES permit WY0022934, in force until Oct 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MM monthly (33 values), outfall 001 form QQ quarterly (2 values), outfall DMP1 form DM monthly (3 values), outfall 001 form MA yearly
Renewal application due
May 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 3 of 29 reports late

Limits in force (44)

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 suspendeddaily maximumreport only (mg/L)all year001
Solids, total suspendedweekly averagereport only (mg/L)all year001
Nitrogen, total [as N]daily maximumreport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 3.33 mg/LMay–Oct001
Nitrogen, ammonia total [as N]monthly average≤ 4.93 mg/LJan, Feb, Mar, Apr, Nov, Dec001
Nitrogen, ammonia total [as N]daily maximum≤ 31.2 mg/LMay–Oct001
Nitrogen, ammonia total [as N]daily maximum≤ 34.5 mg/LJan, Feb, Mar, Apr, 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
Cadmium, dissolved [as Cd]daily maximum≤ .4 ug/Lall year001
Copper, dissolved [as Cu]daily maximum≤ 16.9 ug/Lall year001
Selenium, total [as Se]daily maximum≤ 5 ug/Lall year001
Phosphate, ortho [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 #/100mLMay–Sep001
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
E. colidaily maximum≤ 235 #/100mLMay–Sep001
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowdaily maximum≤ 10.5 MGDall year001
Flowmonthly averagereport only (MGD)all 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 Renewal 7 Day Chronic Ceriodaphnia dubia7-day maximum≤ 0 pass=0;fail=1all year001
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day maximum≤ 0 pass=0;fail=1all year001
pHinstantaneous maximumreport only (SU)all yearDMP1
pHinstantaneous minimumreport only (SU)all yearDMP1
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all yearDMP1

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/WY0022934 · MCP: https://passage-data.com/mcp