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USCOE - Big Bend Dam

Federal facility (Sewerage Systems), Fort Thompson, South Dakota. NPDES permit SD0026361, in force until Dec 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (8 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (8)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratemonthly averagereport only (MGD)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Oil and grease, hexane extr methoddaily maximum≤ 1 mg/Lall year
Floating solids, waste or visible foam-visualdaily maximum≤ 0 abst=0;prst=1all year
Oil and grease visualdaily maximum≤ 0 abst=0;prst=1all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0026361 · MCP: https://passage-data.com/mcp