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Lander, City of

Sewage treatment plant, major discharger, Unknown, Wyoming. NPDES permit WY0020389 expired Apr 30, 2026; its limits still apply. Last 12 months: over a limit 19 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form MM monthly (25 values), outfall 001 form WC quarterly (2 values), outfall DMP1 form MM quarterly (8 values), outfall UMP1 form UM quarterly (4 values), outfall 001 form MA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 41 reports late

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

All 19 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average10.42 mg/L≤ 7.13 mg/L46%
December 2025Nitrogen, ammonia total [as N], daily maximum12.3 mg/L≤ 10.79 mg/L14%
December 2025Nitrogen, ammonia total [as N], monthly average9.88 mg/L≤ 4.78 mg/L107%
January 2026Nitrogen, ammonia total [as N], monthly average4.89 mg/L≤ 4.39 mg/L11%
January 2026pH, instantaneous maximum9.52 SU≤ 9 SU—
February 2026Nitrogen, ammonia total [as N], monthly average4.55 mg/L≤ 3.63 mg/L25%
February 2026pH, instantaneous maximum9.41 SU≤ 9 SU—
March 2026pH, instantaneous maximum9.36 SU≤ 9 SU—
April 2026pH, instantaneous maximum9.12 SU≤ 9 SU—
May 2026Nitrogen, ammonia total [as N], monthly average8.35 mg/L≤ 4.7 mg/L78%
June 2026Nitrogen, ammonia total [as N], monthly average10.7 mg/L≤ 7.53 mg/L42%
July 2026Nitrogen, ammonia total [as N], daily maximum8.7 mg/L≤ 7.01 mg/L24%
July 2026Nitrogen, ammonia total [as N], monthly average7.8 mg/L≤ 2.03 mg/L284%
July 2026Solids, suspended percent removal, monthly average minimum63.636 %≥ 65 %4%
August 2026E. coli, daily maximum700 #/100mL≤ 511 #/100mL37%
August 2026Nitrogen, ammonia total [as N], monthly average6.625 mg/L≤ 2.65 mg/L150%
September 2026Nitrogen, ammonia total [as N], daily maximum10.9 mg/L≤ 5.24 mg/L108%
September 2026Nitrogen, ammonia total [as N], monthly average4.99 mg/L≤ 2.74 mg/L82%
September 2026pH, instantaneous maximum9.2 SU≤ 9 SU—

Limits in force (96)

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
Nitrogen, ammonia total [as N]monthly average≤ 2.74 mg/LSep001
Nitrogen, ammonia total [as N]monthly average≤ 10.11 mg/LApr001
Nitrogen, ammonia total [as N]daily maximum≤ 9.93 mg/LAug001
Nitrogen, ammonia total [as N]monthly average≤ 7.13 mg/LOct001
Nitrogen, ammonia total [as N]daily maximum≤ 9.57 mg/LMar001
Nitrogen, ammonia total [as N]monthly average≤ 3.63 mg/LFeb001
Nitrogen, ammonia total [as N]monthly average≤ 4.78 mg/LDec001
Nitrogen, ammonia total [as N]monthly average≤ 7.53 mg/LJun001
Nitrogen, ammonia total [as N]monthly average≤ 5.6 mg/L (alert, not enforceable)Nov001
Nitrogen, ammonia total [as N]monthly average≤ 4.7 mg/LMay001
Nitrogen, ammonia total [as N]daily maximum≤ 7.01 mg/LJul001
Nitrogen, ammonia total [as N]monthly average≤ 4.39 mg/LJan001
Nitrogen, ammonia total [as N]daily maximum≤ 5.24 mg/LSep001
Nitrogen, ammonia total [as N]daily maximum≤ 24.44 mg/LApr001
Nitrogen, ammonia total [as N]monthly average≤ 2.65 mg/LAug001
Nitrogen, ammonia total [as N]daily maximum≤ 17.25 mg/LOct001
Nitrogen, ammonia total [as N]weekly average≤ 22.14 mg/LMar001
Nitrogen, ammonia total [as N]daily maximum< 8.4 mg/LFeb001
Nitrogen, ammonia total [as N]daily maximum≤ 10.79 mg/LDec001
Nitrogen, ammonia total [as N]daily maximum≤ 29.47 mg/LJun001
Nitrogen, ammonia total [as N]daily maximum< 13.54 mg/L (alert, not enforceable)Nov001
Nitrogen, ammonia total [as N]daily maximum≤ 20.53 mg/LMay001
Nitrogen, ammonia total [as N]monthly average≤ 2.03 mg/LJul001
Nitrogen, ammonia total [as N]daily maximum≤ 10.14 mg/LJan001
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 average≤ 481 #/100mLJun001
E. colimonthly average≤ 1574 #/100mLOct001
E. colimonthly average≤ 1240 #/100mLNov001
E. colimonthly geometric mean≤ 932 #/100mLFeb001
E. colimonthly average≤ 1244 #/100mLDec001
E. colimonthly average≤ 2424 #/100mLMar001
E. colimonthly average≤ 140 #/100mLSep001
E. colimonthly average≤ 207 #/100mLAug001
E. colimonthly geometric mean≤ 1121 #/100mLJan001
E. colimonthly average≤ 2222 #/100mLApr001
E. colimonthly average≤ 245 #/100mLMay001
E. colimonthly average≤ 214 #/100mLJul001
E. colidaily maximum≤ 1230 #/100mLJun001
E. colidaily maximum≤ 1574 #/100mLOct001
E. colidaily maximum≤ 1240 #/100mLNov001
E. colidaily maximum≤ 932 #/100mLFeb001
E. colidaily maximum≤ 1244 #/100mLDec001
E. colidaily maximum≤ 2424 #/100mLMar001
E. colidaily maximum≤ 274 #/100mLSep001
E. colidaily maximum≤ 511 #/100mLAug001
E. colidaily maximum≤ 1121 #/100mLJan001
E. colidaily maximum≤ 2222 #/100mLApr001
E. colidaily maximum≤ 611 #/100mLMay001
E. colidaily maximum≤ 529 #/100mLJul001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Flowmonthly average≤ 3.5 MGDJul001
Flowmonthly average≤ 5 MGDMay, Jun001
Flowmonthly average≤ 2 MGDAug–Oct001
Flowmonthly average≤ 1.8 MGDJan, Feb, Mar, Nov, Dec001
Flowmonthly average≤ 4 MGDApr001
Flowdaily maximumreport only (MGD)Jul001
Flowdaily maximumreport only (MGD)May, Jun001
Flowdaily maximumreport only (MGD)Aug–Oct001
Flowdaily maximumreport only (MGD)Jan, Feb, Mar, Nov, Dec001
Flowdaily maximumreport only (MGD)Apr001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Produced water, oil and greasedaily maximumreport only (mg/L)all 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
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearDMP1
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearDMP1
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearDMP1
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearDMP1
pHinstantaneous minimumreport only (SU)all yearDMP1
pHinstantaneous minimumreport only (SU)all yearDMP1
pHinstantaneous maximumreport only (SU)all yearDMP1
pHinstantaneous maximumreport only (SU)all yearDMP1
E. colidaily maximumreport only (#/100mL)all yearUMP1
E. colidaily maximumreport only (#/100mL)all yearUMP1
Flowdaily maximumreport only (cfs)all yearUMP1
Flowdaily maximumreport only (cfs)all yearUMP1

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/WY0020389 · MCP: https://passage-data.com/mcp