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Sewage treatment plant, Tecumseh, Oklahoma. NPDES permit OK0020788, in force until Jul 31, 2030. Last 12 months: over a limit 27 times (last August 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chlorine, total residual, instantaneous maximum | .31 mg/L | ≤ .099 mg/L | 213% |
| October 2025 | Solids, total suspended, monthly average | 36.5 mg/L | ≤ 15 mg/L | 143% |
| October 2025 | Solids, total suspended, weekly average | 55 mg/L | ≤ 22.5 mg/L | 144% |
| November 2025 | Chlorine, total residual, instantaneous maximum | .6 mg/L | ≤ .099 mg/L | 506% |
| November 2025 | E. coli, daily maximum | 9800 MPN/100mL | ≤ 2030 MPN/100mL | 383% |
| November 2025 | pH, minimum | 6.4 SU | ≥ 6.5 SU | — |
| December 2025 | Chlorine, total residual, instantaneous maximum | .12 mg/L | ≤ .099 mg/L | 21% |
| January 2026 | Chlorine, total residual, instantaneous maximum | .19 mg/L | ≤ .099 mg/L | 92% |
| February 2026 | Chlorine, total residual, instantaneous maximum | .11 mg/L | ≤ .099 mg/L | 11% |
| March 2026 | Chlorine, total residual, instantaneous maximum | .17 mg/L | ≤ .099 mg/L | 72% |
| March 2026 | Solids, total suspended, monthly average | 179.6 lb/d | ≤ 150.12 lb/d | 20% |
| March 2026 | Solids, total suspended, weekly average | 84 mg/L | ≤ 45 mg/L | 87% |
| April 2026 | Chlorine, total residual, instantaneous maximum | .13 mg/L | ≤ .099 mg/L | 31% |
| May 2026 | Chlorine, total residual, instantaneous maximum | .15 mg/L | ≤ .099 mg/L | 52% |
| May 2026 | E. coli, daily maximum | 48800 MPN/100mL | ≤ 406 MPN/100mL | 11920% |
| May 2026 | E. coli, geometric mean | 127.65 MPN/100mL | ≤ 126 MPN/100mL | 1% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 23.16 lb/d | ≤ 15.01 lb/d | 54% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 5.93 mg/L | ≤ 3 mg/L | 98% |
| May 2026 | Nitrogen, ammonia total [as N], weekly average | 14.6 mg/L | ≤ 4.5 mg/L | 224% |
| May 2026 | Oxygen, dissolved [DO], instantaneous minimum | 5.37 mg/L | ≥ 6 mg/L | 11% |
| June 2026 | E. coli, daily maximum | 242000 MPN/100mL | ≤ 406 MPN/100mL | 59506% |
| June 2026 | E. coli, geometric mean | 1835 MPN/100mL | ≤ 126 MPN/100mL | 1356% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 2.32 mg/L | ≤ 2 mg/L | 16% |
| June 2026 | Nitrogen, ammonia total [as N], weekly average | 5.04 mg/L | ≤ 3 mg/L | 68% |
| July 2026 | E. coli, daily maximum | 2600 MPN/100mL | ≤ 406 MPN/100mL | 540% |
| July 2026 | Oxygen, dissolved [DO], instantaneous minimum | 5.3 mg/L | ≥ 6 mg/L | 12% |
| August 2026 | pH, minimum | 6.42 SU | ≥ 6.5 SU | — |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Apr–Oct |
| Solids, total suspended | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | weekly average | ≤ 22.5 mg/L | Apr–Oct |
| Solids, total suspended | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec |
| Solids, total suspended | monthly average | ≤ 75.06 lb/d | Apr–Oct |
| Solids, total suspended | monthly average | ≤ 150.12 lb/d | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 mg/L | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.5 mg/L | Apr, May |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3 mg/L | Jun–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 15.01 lb/d | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 10 lb/d | Jun–Oct |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 50.04 lb/d | Jan, Feb, Mar, Nov, Dec |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 22.5 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | Apr–Oct |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 75.06 lb/d | Jan, Feb, Mar, Nov, Dec |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 50.04 lb/d | Apr–Oct |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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