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Yellowstone Energy Limited Partnership

Electric Services, Billings, Montana. NPDES permit MT0030180 expired Apr 30, 2019; its limits still apply. Last 12 months: over a limit 20 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (15 values), form Q quarterly (1 value), form UP quarterly (6 values), form WQ quarterly (2 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
26 values over a limit, 0 required values missing, 0 of 25 reports late

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

All 20 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, total recoverable, daily maximum87 ug/L≤ 13.92 ug/L525%
October 2025Copper, total recoverable, monthly average46 ug/L≤ 9.53 ug/L383%
November 2025Copper, total recoverable, daily maximum174 ug/L≤ 13.92 ug/L1150%
November 2025Copper, total recoverable, monthly average64 ug/L≤ 9.53 ug/L572%
December 2025Copper, total recoverable, daily maximum99 ug/L≤ 13.92 ug/L611%
December 2025Copper, total recoverable, monthly average65 ug/L≤ 9.53 ug/L582%
January 2026Copper, total recoverable, daily maximum130 ug/L≤ 13.92 ug/L834%
January 2026Copper, total recoverable, monthly average97 ug/L≤ 9.53 ug/L918%
February 2026Copper, total recoverable, daily maximum84 ug/L≤ 13.92 ug/L503%
February 2026Copper, total recoverable, monthly average42 ug/L≤ 9.53 ug/L341%
March 2026Copper, total recoverable, daily maximum167 ug/L≤ 13.92 ug/L1100%
March 2026Copper, total recoverable, monthly average87 ug/L≤ 9.53 ug/L813%
April 2026Copper, total recoverable, daily maximum34 ug/L≤ 13.92 ug/L144%
April 2026Copper, total recoverable, monthly average23.8 ug/L≤ 9.53 ug/L150%
May 2026Copper, total recoverable, daily maximum92 ug/L≤ 13.92 ug/L561%
May 2026Copper, total recoverable, monthly average48 ug/L≤ 9.53 ug/L404%
June 2026Copper, total recoverable, daily maximum64 ug/L≤ 13.92 ug/L360%
June 2026Copper, total recoverable, monthly average63.5 ug/L≤ 9.53 ug/L566%
August 2026Copper, total recoverable, daily maximum21 ug/L≤ 13.92 ug/L51%
August 2026Copper, total recoverable, monthly average21 ug/L≤ 9.53 ug/L120%

Limits in force (25)

ParameterStatisticLimitMonths
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Flow ratequarterly averagereport only (gal/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
pHquarterly averagereport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 100 mg/Lall year
Oil and grease, hexane extr methodmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Phosphorus, total [as P]quarterly averagereport only (mg/L)all year
Phosphorus, total [as P]quarterly averagereport only (mg/L)all year
Hardness, total [as CaCO3]quarterly averagereport only (mg/L)all year
Zinc, total recoverablemonthly average≤ 116 ug/Lall year
Zinc, total recoverabledaily maximum≤ 178 ug/Lall year
Zinc, total recoverablequarterly averagereport only (ug/L)all year
Copper, total recoverablemonthly average≤ 9.53 ug/Lall year
Copper, total recoverabledaily maximum≤ 13.92 ug/Lall year
Copper, total recoverablequarterly averagereport only (ug/L)all year
Chlorine, total residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
Solids, total dissolved30-day averagereport only (mg/L)all year
Report due [yrmoda]value≤ 1 abst=0;prst=1all year
Pass/Fail Static 48Hr Acute Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvalue≤ 0 pass=0;fail=1all year

How strict are these limits?

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

Same industry: the 3 Electric Services permits in Montana.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0030180 · MCP: https://passage-data.com/mcp