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Ardmore, City of (Ind Air Park)

Sewage treatment plant, Ardmore, Oklahoma. NPDES permit OK0030422, in force until May 31, 2029. Last 12 months: over a limit 10 times (last March 2026), 13 required values missing, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due: About 16 days after each period: form A monthly (13 values)
Last report on file: August 2026
Oct 2024 – Sep 2025: 0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period ending	Parameter	Reported	Limit	Over by
October 2025	Chlorine, total residual, instantaneous maximum	2.2 mg/L	≤ .099 mg/L	2122%
October 2025	Chlorine, total residual, instantaneous maximum	2.2 mg/L	≤ .099 mg/L	2122%
October 2025	E. coli, daily maximum	> 2419.6 MPN/100mL	≤ 2030 MPN/100mL	—
October 2025	E. coli, daily maximum	> 2419.6 MPN/100mL	≤ 2030 MPN/100mL	—
December 2025	Solids, total suspended, monthly average	37 mg/L	≤ 30 mg/L	23%
December 2025	Solids, total suspended, weekly average	48 mg/L	≤ 45 mg/L	7%
January 2026	Solids, total suspended, monthly average	35 mg/L	≤ 30 mg/L	17%
February 2026	E. coli, daily maximum	> 2419.6 MPN/100mL	≤ 2030 MPN/100mL	—
March 2026	Solids, total suspended, monthly average	49 mg/L	≤ 30 mg/L	63%
March 2026	Solids, total suspended, weekly average	90 mg/L	≤ 45 mg/L	100%

Limits in force (15)

Parameter	Statistic	Limit	Months
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year
BOD, 5-day, 20 deg. C	weekly average	≤ 45 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 50 lb/d	all year
pH	minimum	≥ 6.5 SU	all year
pH	maximum	≤ 9 SU	all year
Solids, total suspended	monthly average	≤ 30 mg/L	all year
Solids, total suspended	weekly average	≤ 45 mg/L	all year
Solids, total suspended	monthly average	≤ 50 lb/d	all year
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year
Chlorine, total residual	instantaneous maximum	≤ .099 mg/L	all year
E. coli	geometric mean	≤ 126 MPN/100mL	May–Sep
E. coli	geometric mean	≤ 630 MPN/100mL	Jan, Feb, Mar, Apr, Oct, Nov, Dec
E. coli	daily maximum	≤ 406 MPN/100mL	May–Sep
E. coli	daily maximum	≤ 2030 MPN/100mL	Jan, Feb, Mar, Apr, Oct, Nov, Dec

How strict are these limits?

Solids, total suspended, monthly average 30 mg/L — stricter than 44% of 176 other minor POTWs in Oklahoma; 34% have the same limit
Solids, total suspended, weekly average 45 mg/L — stricter than 44% of 171 other minor POTWs in Oklahoma; 34% have the same limit

Cited limits by parameter: Oklahoma'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/OK0030422 · MCP: https://passage-data.com/mcp