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Black Hills Corporation

Electric Services, Cheyenne, Wyoming. NPDES permit WY0097001, in force until Oct 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form PT every 60 months, form QA yearly, form QQ quarterly
Last report on file
June 2026

Limits in force (25)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedannual average≤ 27 mg/Lall year
Solids, total suspendedannual average≤ 27 mg/Lall year
Solids, total suspendedquarterly maximumreport only (mg/L)all year
Solids, total suspendedquarterly maximumreport only (mg/L)all year
Arsenic, dissolved [as As]daily maximum≤ 10.6 ug/Lall year
Chromium, total [as Cr]daily maximum≤ .2 mg/Lall year
Chromium, total [as Cr]monthly average≤ .2 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year
Selenium, total [as Se]monthly average≤ 20 ug/Lall year
Selenium, total [as Se]daily maximum≤ 5 ug/Lall year
Durationmonthly totalreport only (d)all year
Chlorine, total residualdaily maximum≤ .0203 mg/Lall year
Chlorine, total residualmonthly average≤ .0118 mg/Lall year
Chlorine, free availabledaily maximum≤ .5 mg/Lall year
Chlorine, free availablemonthly average≤ .2 mg/Lall year
Flowdaily maximum≤ .052 MGDall year
Flowmonthly averagereport only (MGD)all 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/WY0097001 · MCP: https://passage-data.com/mcp