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Tishomingo, City of

Sewage treatment plant, Tishomingo, Oklahoma. NPDES permit OK0031992, in force until Apr 30, 2029. Last 12 months: over a limit 15 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (20 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 2 of 12 reports late

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

All 15 values over a limit
Period endingParameterReportedLimitOver by
October 2025Phosphorus, total [as P], monthly average5.37 mg/L≤ 4.77 mg/L13%
January 2026BOD, carbonaceous [5 day, 20 C], monthly average14.5 mg/L≤ 9 mg/L61%
January 2026BOD, carbonaceous [5 day, 20 C], weekly average25.8 mg/L≤ 13.5 mg/L91%
January 2026Nitrogen, ammonia total [as N], monthly average12.2 mg/L≤ 6 mg/L103%
January 2026Nitrogen, ammonia total [as N], weekly average19.8 mg/L≤ 9 mg/L120%
January 2026Solids, total suspended, monthly average16.9 mg/L≤ 15 mg/L13%
January 2026Solids, total suspended, weekly average30 mg/L≤ 22.5 mg/L33%
February 2026Nitrogen, ammonia total [as N], monthly average13.06 mg/L≤ 6 mg/L118%
February 2026Nitrogen, ammonia total [as N], weekly average21.4 mg/L≤ 9 mg/L138%
April 2026Chlorine, total residual, instantaneous maximum.1 mg/L≤ .099 mg/L1%
April 2026Oxygen, dissolved [DO], minimum5.76 mg/L≥ 7 mg/L18%
April 2026pH, minimum6.08 SU≥ 6.5 SU—
May 2026Oxygen, dissolved [DO], minimum6.05 mg/L≥ 7 mg/L14%
May 2026Phosphorus, total [as P], monthly average4.91 mg/L≤ 4.77 mg/L3%
July 2026pH, minimum6.43 SU≥ 6.5 SU—

Limits in force (27)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/LJun–Oct
Oxygen, dissolved [DO]minimum≥ 7 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 22.5 mg/Lall year
Solids, total suspendedmonthly average≤ 66.8 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LApr, May
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 7.5 mg/LApr, May
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LJun–Oct
Nitrogen, ammonia total [as N]weekly average≤ 9 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 22.9 lb/dApr, May
Nitrogen, ammonia total [as N]monthly average≤ 9.2 lb/dJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 27.6 lb/dJan, Feb, Mar, Nov, Dec
Phosphorus, total [as P]monthly average≤ 4.77 mg/Lall year
Phosphorus, total [as P]daily maximum≤ 10.46 mg/Lall year
Phosphorus, total [as P]monthly average≤ 21.9 lb/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualinstantaneous maximum≤ .099 mg/Lall year
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. colidaily maximum≤ 406 MPN/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 9 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 13.5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 41.3 lb/dall year

How strict are these limits?

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/OK0031992 · MCP: https://passage-data.com/mcp