Keystone Manor WWTF — NPDES permit OK0036081: limits, due date and EPA's record

Keystone Manor WWTF

Sewerage Systems, Tulsa, Oklahoma. NPDES permit OK0036081, in force until Oct 31, 2027. Last 12 months: over a limit 19 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 15 days after each period: form A monthly (14 values)

Renewal application due

May 4, 2027 · 180 days before expiry; your permit may set another date

Last report on file

August 2026

Oct 2024 – Sep 2025

47 values over a limit, 0 required values missing, 0 of 12 reports late

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

All 19 values over a limit

Period ending	Parameter	Reported	Limit	Over by
December 2025	BOD, 5-day, 20 deg. C, monthly average	65.1 mg/L	≤ 20 mg/L	226%
December 2025	BOD, 5-day, 20 deg. C, monthly average	8.2 lb/d	≤ 4.4 lb/d	86%
December 2025	BOD, 5-day, 20 deg. C, weekly average	65.1 mg/L	≤ 30 mg/L	117%
January 2026	BOD, 5-day, 20 deg. C, monthly average	36.1 mg/L	≤ 20 mg/L	81%
January 2026	BOD, 5-day, 20 deg. C, weekly average	36.1 mg/L	≤ 30 mg/L	20%
February 2026	BOD, 5-day, 20 deg. C, monthly average	23.2 mg/L	≤ 20 mg/L	16%
March 2026	BOD, 5-day, 20 deg. C, monthly average	6.2 lb/d	≤ 4.4 lb/d	41%
March 2026	BOD, 5-day, 20 deg. C, monthly average	66.1 mg/L	≤ 20 mg/L	231%
March 2026	BOD, 5-day, 20 deg. C, weekly average	66.1 mg/L	≤ 30 mg/L	120%
April 2026	BOD, 5-day, 20 deg. C, monthly average	56.1 mg/L	≤ 20 mg/L	181%
April 2026	BOD, 5-day, 20 deg. C, monthly average	6.3 lb/d	≤ 4.4 lb/d	43%
April 2026	BOD, 5-day, 20 deg. C, weekly average	56.1 mg/L	≤ 30 mg/L	87%
May 2026	BOD, 5-day, 20 deg. C, monthly average	56.1 mg/L	≤ 20 mg/L	181%
May 2026	BOD, 5-day, 20 deg. C, monthly average	6.3 lb/d	≤ 4.4 lb/d	43%
May 2026	BOD, 5-day, 20 deg. C, weekly average	56.1 mg/L	≤ 30 mg/L	87%
May 2026	Solids, total suspended, monthly average	30.4 mg/L	≤ 30 mg/L	1%
June 2026	Solids, total suspended, monthly average	34 mg/L	≤ 30 mg/L	13%
August 2026	BOD, 5-day, 20 deg. C, monthly average	35.4 mg/L	≤ 20 mg/L	77%
August 2026	BOD, 5-day, 20 deg. C, weekly average	35.4 mg/L	≤ 30 mg/L	18%

Limits in force (14)

Parameter	Statistic	Limit	Months
Oxygen, dissolved [DO]	monthly minimum	≥ 5 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 20 mg/L	all year
BOD, 5-day, 20 deg. C	weekly average	≤ 30 mg/L	all year
BOD, 5-day, 20 deg. C	monthly average	≤ 4.4 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	≤ 6.6 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	May–Sep
E. coli	geometric mean	≤ 126 CFU/100mL	May–Sep
E. coli	daily maximum	≤ 235 CFU/100mL	May–Sep

How strict are these limits?

E. coli, daily maximum 235 CFU/100mL — stricter than 72% of 91 other minor industrial and other permits nationwide; 10% have the same limit

Oxygen, dissolved [DO], monthly minimum at least 5 mg/L — stricter than 71% of 724 other minor industrial and other permits nationwide; 6% have the same limit

BOD, 5-day, 20 deg. C, monthly average 20 mg/L — stricter than 65% of 2,447 other minor industrial and other permits nationwide; 11% have the same limit

Your permit document is the final word. As JSON: /api/v1/permits/OK0036081 · MCP: https://passage-data.com/mcp