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Otter Tail Power Company

Electric Services, Beulah, North Dakota. NPDES permit ND0024996, in force until Mar 31, 2028. Last 12 months: over a limit once (last April 2026), 12 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 89 days after each period: outfall 003 form A quarterly (8 values), outfall 005 form A quarterly (20 values), outfall 012 form A quarterly (27 values), outfall CWI form S quarterly (2 values)
Renewal application due
Oct 3, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 48 reports late

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

Period endingParameterReportedLimitOver by
April 2026Chlorine, free available, daily maximum.41 lb/d≤ .11 lb/d273%

Limits in force (57)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendeddaily minimumreport only (mg/L)all year003
Solids, total suspendedmonthly averagereport only (mg/L)all year003
Solids, total suspendeddaily maximum≤ 50 mg/Lall year003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Flow, totaltotalreport only (Mgal)all year003
pHminimum≥ 6.5 SUall year005
pHmaximum≤ 9 SUall year005
Nitrogen, total [as N]daily minimumreport only (mg/L)all year005
Nitrogen, total [as N]monthly averagereport only (mg/L)all year005
Nitrogen, total [as N]daily maximumreport only (mg/L)all year005
Nitrogen, total [as N]monthly averagereport only (lb/d)all year005
Nitrogen, total [as N]daily maximumreport only (lb/d)all year005
Phosphorus, total [as P]daily minimumreport only (mg/L)all year005
Phosphorus, total [as P]monthly averagereport only (mg/L)all year005
Phosphorus, total [as P]daily maximumreport only (mg/L)all year005
Phosphorus, total [as P]monthly averagereport only (lb/d)all year005
Phosphorus, total [as P]daily maximumreport only (lb/d)all year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Chlorine, free availabledaily minimumreport only (mg/L)all year005
Chlorine, free availabledaily average≤ .2 mg/Lall year005
Chlorine, free availabledaily maximum≤ .5 mg/Lall year005
Chlorine, free available30-day average≤ .04 lb/dall year005
Chlorine, free availabledaily maximum≤ .11 lb/dall year005
Flow, totaltotalreport only (Mgal)all year005
pHminimum≥ 6 SU (alert, not enforceable)all year012
pHmaximum≤ 9 SU (alert, not enforceable)all year012
Solids, total suspendeddaily minimumreport only (mg/L) (alert, not enforceable)all year012
Solids, total suspendedmonthly averagereport only (mg/L) (alert, not enforceable)all year012
Solids, total suspendeddaily maximum≤ 100 mg/L (alert, not enforceable)all year012
Oil & Greasedaily minimumreport only (mg/L)all year012
Oil & Greasemonthly averagereport only (mg/L)all year012
Oil & Greasedaily maximum≤ 15 mg/Lall year012
Chloride [as Cl]daily minimumreport only (mg/L) (alert, not enforceable)all year012
Chloride [as Cl]monthly averagereport only (mg/L) (alert, not enforceable)all year012
Chloride [as Cl]daily maximum≤ 250 mg/L (alert, not enforceable)all year012
Sulfate, total [as SO4]daily minimumreport only (mg/L) (alert, not enforceable)all year012
Sulfate, total [as SO4]monthly averagereport only (mg/L) (alert, not enforceable)all year012
Sulfate, total [as SO4]daily maximum≤ 750 mg/L (alert, not enforceable)all year012
Arsenic, total [as As]daily minimumreport only (mg/L) (alert, not enforceable)all year012
Arsenic, total [as As]monthly averagereport only (mg/L) (alert, not enforceable)all year012
Arsenic, total [as As]daily maximum≤ .15 mg/L (alert, not enforceable)all year012
Boron, total [as B]daily minimumreport only (mg/L) (alert, not enforceable)all year012
Boron, total [as B]monthly averagereport only (mg/L) (alert, not enforceable)all year012
Boron, total [as B]daily maximum≤ .15 mg/L (alert, not enforceable)all year012
Iron, total [as Fe]daily minimumreport only (mg/L) (alert, not enforceable)all year012
Iron, total [as Fe]monthly averagereport only (mg/L) (alert, not enforceable)all year012
Iron, total [as Fe]daily maximum≤ 1 mg/L (alert, not enforceable)all year012
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD) (alert, not enforceable)all year012
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all year012
Flow, totaltotalreport only (Mgal) (alert, not enforceable)all year012
Oil and grease visualtotal≤ 0 N=0;Y=1 (alert, not enforceable)all year012
Flow, process wastewater30-day averagereport only (MGD)all yearCWI
Flow, process wastewaterdaily maximumreport only (MGD)all yearCWI

How strict are these limits?

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

Same industry: the 6 Electric Services permits in North Dakota.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ND0024996 · MCP: https://passage-data.com/mcp