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Black Hills Energy

Industrial or other facility, (Unknown City), Wyoming. NPDES permit WY0096784, in force until Apr 30, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form MQ quarterly (3 values), form QQ quarterly (17 values), form WA yearly
Renewal application due
Nov 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 17 reports late

Limits in force (22)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Chromium, total [as Cr]daily maximumreport only (mg/L)all year
Copper, total [as Cu]daily maximum≤ 1 mg/Lall year
Copper, total [as Cu]monthly average≤ 1 mg/Lall year
Iron, total [as Fe]daily maximum≤ 1 mg/Lall year
Iron, total [as Fe]monthly average≤ 1 mg/Lall year
Zinc, total [as Zn]daily maximum≤ 1 mg/Lall year
Zinc, total [as Zn]monthly average≤ 1 mg/Lall year
Aluminum, dissolved [as Al]daily maximum≤ 750 ug/Lall year
Chloridedaily maximum≤ .5 mg/Lall year
Chloridemonthly average≤ .2 mg/Lall year
Durationmonthly totalreport only (d/mo)all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Flowmonthly averagereport only (MGD)all year
Flowdaily maximumreport 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

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0096784 · MCP: https://passage-data.com/mcp