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Electronic Coils And Transformers, Yankton, South Dakota. NPDES permit SD0025917, in force until Dec 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Flow rate | 30-day average | report only (MGD) | all year |
| Flow rate | daily maximum | report only (MGD) | all year |
| Conductivity | 30-day average | report only (umho/cm) | all year |
| Conductivity | daily maximum | report only (umho/cm) | all year |
| pH | daily minimum | ≥ 6.5 SU | all year |
| pH | daily maximum | ≤ 8.3 SU | all year |
| Oil and grease, hexane extr method | daily maximum | ≤ 1 mg/L | all year |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 abst=0;prst=1 | all year |
| Flow, total | monthly total | report only (Mgal) | all year |
| Solids, total dissolved [TDS] | 30-day average | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | daily maximum | report only (mg/L) | all year |
| Hydrocarbons, petroleum | daily maximum | ≤ 1 mg/L | all year |
| Oil and grease visual | daily maximum | ≤ 0 abst=0;prst=1 | all year |
Cited limits by parameter: South Dakota'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/SD0025917 · MCP: https://passage-data.com/mcp