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Cherokee Utilities Authority

Water Supply, Cherokee, Oklahoma. NPDES permit OK0045055, in force until Jun 30, 2029. Last 12 months: no values over a limit, 2 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (10 values), outfall 999 form A monthly (1 value), outfall 001 form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 3 required values missing, 1 of 26 reports late

Limits in force (14)

ParameterStatisticLimitMonthsOutfall
pHminimum≥ 6.5 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 20 mg/Lall year001
Solids, total suspendeddaily maximum≤ 30 mg/Lall year001
Solids, total suspendedmonthly average≤ 21.5 lb/dall year001
Chloride [as Cl]monthly averagereport only (mg/L)all year001
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year001
Selenium, total [as Se]monthly averagereport only (ug/L)all year001
Selenium, total [as Se]daily maximumreport only (ug/L)all year001
Selenium, total [as Se]monthly averagereport only (lb/d)all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year001
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year999

New limits from Jul 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Selenium, total [as Se], daily maximum21.65 ug/Lnew25.2 ug/L (11 values)1.16×
Selenium, total [as Se], monthly average0.016 lb/dnew0.022 lb/d (11 values)1.38×
Selenium, total [as Se], monthly average15.11 ug/Lnew24 ug/L (11 values)1.59×

How strict are these limits?

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

Same industry: the 49 Water Supply permits in Oklahoma.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OK0045055 · MCP: https://passage-data.com/mcp