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Lyman, Town of

Sewage treatment plant, (Unknown City), Wyoming. NPDES permit WY0020117, in force until Sep 30, 2027. Last 12 months: over a limit 13 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: outfall 002 form MQ quarterly (42 values), outfall 002 form QQ quarterly (1 value), outfall 003 form MA yearly (4 values), outfall CRS1 form MQ quarterly (2 values), outfall CRS2 form MQ quarterly (2 values), outfall DMP1 form QQ quarterly (4 values), and 2 more forms
Renewal application due
Apr 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
12 values over a limit, 9 required values missing, 7 of 58 reports late

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

All 13 values over a limit
Period endingParameterReportedLimitOver by
January 2026E. coli, daily maximum649 #/100mL≤ 630 #/100mL3%
April 2026BOD, 5-day, 20 deg. C, monthly average76 mg/L≤ 30 mg/L153%
April 2026BOD, 5-day, 20 deg. C, weekly average76 mg/L≤ 65 mg/L17%
April 2026BOD, 5-day, percent removal, monthly average minimum15 %≥ 65 %143%
April 2026Produced water, oil and grease, daily maximum76 mg/L≤ 10 mg/L660%
April 2026Solids, total suspended, monthly average134 mg/L≤ 100 mg/L34%
April 2026pH, instantaneous maximum9.4 SU≤ 9 SU—
May 2026BOD, 5-day, percent removal, monthly average minimum58 %≥ 65 %20%
May 2026E. coli, daily maximum1990 #/100mL≤ 576 #/100mL245%
May 2026pH, instantaneous maximum9.26 SU≤ 9 SU—
June 2026BOD, 5-day, 20 deg. C, monthly average44 mg/L≤ 30 mg/L47%
June 2026BOD, 5-day, percent removal, monthly average minimum59 %≥ 65 %17%
July 2026BOD, 5-day, percent removal, monthly average minimum35 %≥ 65 %86%

Limits in force (70)

ParameterStatisticLimitMonthsOutfall
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. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cdaily maximumreport only (mg/L)all year002
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all 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. Cweekly averagereport only (mg/L)all year002
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 100 mg/Lall year002
Solids, total suspendedmonthly average≤ 100 mg/Lall year002
Solids, total suspendedweekly average≤ 150 mg/Lall year002
Solids, total suspendedweekly average≤ 150 mg/Lall year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year002
Phosphorus, total [as P]daily maximumreport only (mg/L)all year002
Chlorine, total residualmonthly average≤ .011 mg/Lall year002
Chlorine, total residualmonthly average≤ .011 mg/Lall year002
Chlorine, total residualdaily maximum≤ .019 mg/Lall year002
Chlorine, total residualdaily maximum≤ .019 mg/Lall year002
E. colimonthly geometric mean≤ 126 #/100mLMay–Sep002
E. colimonthly geometric mean≤ 126 #/100mLMay–Sep002
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
E. colimonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
E. colidaily maximum≤ 576 #/100mLMay–Sep002
E. colidaily maximum≤ 576 #/100mLMay–Sep002
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
E. colidaily maximum≤ 630 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec002
Solids, total dissolveddaily maximumreport only (mg/L)all year002
Solids, total dissolveddaily maximumreport only (mg/L)all year002
Solids, total dissolvedmonthly averagereport only (mg/L)all year002
Solids, total dissolvedmonthly averagereport only (mg/L)all year002
Solids, total dissolvedannual maximum≤ 366 ton/yrall year002
Flowdaily maximumreport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002
Flowmonthly averagereport only (MGD)all year002
Flowmonthly averagereport only (MGD)all year002
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year002
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year002
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year002
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year002
pHinstantaneous minimum≥ 6.5 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Solids, total suspendedmonthly average≤ 100 mg/Lall year003
Solids, total suspendedweekly average≤ 150 mg/Lall year003
Solids, total suspendeddaily maximumreport only (mg/L)all year003
Solids, total dissolved [TDS]daily maximum≤ 5000 mg/Lall year003
Flowmonthly averagereport only (MGD)all year003
Flowmonthly averagereport only (MGD)all year003
Flowdaily maximumreport only (MGD)all year003
Flowdaily maximumreport only (MGD)all year003
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year003
Solids, total dissolveddaily maximumreport only (mg/L)all yearCRS1
Solids, total dissolveddaily maximumreport only (mg/L)all yearCRS1
Solids, total dissolveddaily maximumreport only (mg/L)all yearCRS2
Solids, total dissolveddaily maximumreport only (mg/L)all yearCRS2
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearDMP1
pHinstantaneous minimumreport only (SU)all yearDMP1
pHinstantaneous maximumreport only (SU)all yearDMP1
Nitrogen, ammonia total [as N]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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Your permit document is the final word. As JSON: /api/v1/permits/WY0020117 · MCP: https://passage-data.com/mcp