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EJ USA, Inc-Ardmore

Gray And Ductile Iron Foundries, Ardmore, Oklahoma. NPDES permit OK0044288, in force until Aug 31, 2029. Last 12 months: over a limit 8 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 002 form A monthly (11 values), outfall 003 form A monthly (11 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 24 reports late

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

Period endingOutfallParameterReportedLimit
January 2026002pH, minimum6.24 SU≥ 6.5 SU
January 2026003pH, minimum6.18 SU≥ 6.5 SU
February 2026002pH, minimum6.38 SU≥ 6.5 SU
February 2026003pH, minimum6.28 SU≥ 6.5 SU
March 2026002pH, minimum6.21 SU≥ 6.5 SU
March 2026003pH, minimum6.41 SU≥ 6.5 SU
May 2026002pH, minimum6.3 SU≥ 6.5 SU
May 2026003pH, minimum6.23 SU≥ 6.5 SU

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly average≤ 52 deg Call year002
Temperature, water deg. centigradeweekly average≤ 52 deg Call year002
Temperature, water deg. centigradedaily maximum≤ 52 deg Call year002
pHminimum≥ 6.5 SUall year002
pHmaximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximum≤ 45 mg/Lall year002
Solids, total suspendedmonthly averagereport only (lb/d)all year002
Solids, total suspendeddaily maximum≤ 10.1 lb/dall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Temperature, water deg. centigrademonthly average≤ 46.5 deg Call year003
Temperature, water deg. centigradeweekly average≤ 52 deg Call year003
Temperature, water deg. centigradedaily maximum≤ 52 deg Call year003
pHminimum≥ 6.5 SUall year003
pHmaximum≤ 9 SUall year003
Solids, total suspendedmonthly averagereport only (mg/L)all year003
Solids, total suspendeddaily maximum≤ 45 mg/Lall year003
Solids, total suspendedmonthly averagereport only (lb/d)all year003
Solids, total suspendeddaily maximum≤ 62.3 lb/dall 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

How strict are these limits?

Cited limits by parameter: Oklahoma'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/OK0044288 · MCP: https://passage-data.com/mcp