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Pacificorp/Naughton Plant

Electric Services, Kemmerer, Wyoming. NPDES permit WY0020311, in force until Mar 31, 2030. Last 12 months: over a limit 4 times (last June 2026), 15 required values missing, 6 of 34 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form MA yearly (4 values), form MQ quarterly (24 values), form WQ quarterly (22 values), form AA yearly, form SA yearly, form WA twice a year, and 1 more form
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 23 required values missing, 13 of 43 reports late

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

Period endingParameterReportedLimitOver by
April 2026Chlorine, total residual, daily maximum.02 mg/L≤ .019 mg/L5%
May 2026Chlorine, total residual, daily maximum.02 mg/L≤ .019 mg/L5%
May 2026Selenium, total [as Se], daily maximum15.6 ug/L≤ 5 ug/L212%
June 2026Chlorine, total residual, daily maximum.02 mg/L≤ .019 mg/L5%

Limits in force (59)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year
Copper, total [as Cu]monthly average≤ 1 mg/Lall year
Copper, total [as Cu]monthly average≤ 1 mg/Lall year
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]monthly average≤ 1 mg/Lall year
Iron, total [as Fe]monthly average≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year
Selenium, total [as Se]daily maximum≤ 5 ug/Lall year
Selenium, total [as Se]daily maximum≤ 5 ug/Lall year
Durationmonthly totalreport only (d)all year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
E. colidaily maximumreport only (CFU/100mL)all year
E. colimonthly averagereport only (CFU/100mL)all year
Nitrogen, Ammonia Totaldaily maximumreport only (mg/L)all year
Nitrogen, Ammonia Totalmonthly averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolvedannual totalreport only (ton/yr)all year
Solids, total dissolvedmonthly averagereport only (ton/mo)all year
Solids, total dissolvedmonthly averagereport only (ton/mo)all year
Solids, total dissolveddaily maximumreport only (ton/mo)all year
Solids, total dissolveddaily maximumreport only (ton/mo)all year
Flowmonthly averagereport only (MGD)all year
Flowmonthly averagereport only (MGD)all year
Flowweekly averagereport only (MGD)all year
Flowweekly averagereport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year
Pass/Fail Static 48Hr Acute Ceriodaphnia dubia48-hour maximum≤ 0 pass=0;fail=1all year
Pass/Fail Static 96 Hr Acute Pimephales Promelas96-hour value≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia7-day maximum≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelas7-day maximum≤ 0 pass=0;fail=1all year

How strict are these limits?

Cited limits by parameter: Wyoming's rules and the federal ones.

Same industry: the 3 Electric Services permits in Wyoming.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0020311 · MCP: https://passage-data.com/mcp