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Yankton, City of Water Purification Facility

Water Supply, Yankton, South Dakota. NPDES permit SD0028628 expired Sep 30, 2024; its limits still apply. Last 12 months: no values over a limit, 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 12 reports late

Limits in force (16)

ParameterStatisticLimitMonths
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Conductivity30-day average≤ 33739 umho/cmall year
Conductivitydaily maximumreport only (umho/cm)all year
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Alkalinity, total [as CaCO3]30-day average≤ 11770 mg/Lall year
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year
Chloride [as Cl]30-day average≤ 5021 mg/Lall year
Chloride [as Cl]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]30-day average≤ 10043 mg/Lall year
Sulfate, total [as SO4]daily maximum≤ 17574 mg/Lall year
Chlorine, total residualdaily maximum≤ .382 mg/Lall year
Flow, totalmonthly totalreport only (Mgal)all year
Solids, total dissolved30-day average≤ 8687 mg/Lall year
Solids, total dissolveddaily maximum≤ 23751 mg/Lall year

How strict are these limits?

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

Same industry: the 4 Water Supply permits in South Dakota.

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/SD0028628 · MCP: https://passage-data.com/mcp