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Sewerage Systems, major discharger, Wright City, Missouri. NPDES permit MO0140503, in force until Jun 30, 2029. Last 12 months: over a limit 22 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Chloride, daily maximum | 654 | ≤ 378 mg/L | 73% |
| October 2025 | Chloride, monthly average | 654 | ≤ 188 mg/L | 248% |
| November 2025 | Chloride, daily maximum | 598 | ≤ 378 mg/L | 58% |
| November 2025 | Chloride, monthly average | 598 | ≤ 188 mg/L | 218% |
| December 2025 | Chloride, daily maximum | 476 | ≤ 378 mg/L | 26% |
| December 2025 | Chloride, monthly average | 476 | ≤ 188 mg/L | 153% |
| January 2026 | Chloride, daily maximum | 640 | ≤ 378 mg/L | 69% |
| January 2026 | Chloride, monthly average | 640 | ≤ 188 mg/L | 240% |
| February 2026 | Chloride, daily maximum | 583 | ≤ 378 mg/L | 54% |
| February 2026 | Chloride, monthly average | 583 | ≤ 188 mg/L | 210% |
| March 2026 | Chloride, daily maximum | 382 | ≤ 378 mg/L | 1% |
| March 2026 | Chloride, monthly average | 382 | ≤ 188 mg/L | 103% |
| April 2026 | Chloride, daily maximum | 515 | ≤ 378 mg/L | 36% |
| April 2026 | Chloride, monthly average | 515 | ≤ 188 mg/L | 174% |
| May 2026 | Chloride, daily maximum | 480 | ≤ 378 mg/L | 27% |
| May 2026 | Chloride, monthly average | 480 | ≤ 188 mg/L | 155% |
| June 2026 | Chloride, daily maximum | 601 | ≤ 378 mg/L | 59% |
| June 2026 | Chloride, monthly average | 601 | ≤ 188 mg/L | 220% |
| July 2026 | Chloride, daily maximum | 537 | ≤ 378 mg/L | 42% |
| July 2026 | Chloride, monthly average | 537 | ≤ 188 mg/L | 186% |
| August 2026 | Chloride, daily maximum | 552 | ≤ 378 mg/L | 46% |
| August 2026 | Chloride, monthly average | 552 | ≤ 188 mg/L | 194% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | ≥ 7 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 7 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 15 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 10 mg/L | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | ≤ 11 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.2 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .7 mg/L | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | ≤ 10 mg/L | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | total | ≤ 8523.48 lb/yr | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | average | report only (lb/mo) | all year | 001 |
| Iron, total recoverable | daily maximum | ≤ 1643 ug/L | all year | 001 |
| Iron, total recoverable | monthly average | ≤ 819 ug/L | all year | 001 |
| Chloride | daily maximum | ≤ 378 mg/L | all year | 001 |
| Chloride | monthly average | ≤ 188 mg/L | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 3.5 MGD | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 18.1 ug/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | all year | 001 |
| E. coli | daily maximum | ≤ 1030 #/100mL | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | all year | 001 |
| Nitrogen, Kjeldahl, total [TKN] [water] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [TKN] [water] | monthly average | report only (mg/L) | all year | 001 |
| Toxicity [chronic], Ceriodaphnia dubia | value | ≤ 1.1 toxic | all year | 001 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | value | ≤ 1.1 toxic | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 001 |
| Coliform, fecal general | monthly average | report only (#/100mL) | all year | 001 |
| Flow, total | monthly total | report only (MGD) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | INF |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | INF |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | INF |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | INF |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | INF |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | INF |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | INF |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | INF |
| Nitrogen, Kjeldahl, total [TKN] [water] | daily maximum | report only (mg/L) | all year | INF |
| Nitrogen, Kjeldahl, total [TKN] [water] | monthly average | report only (mg/L) | all year | INF |
Cited limits by parameter: Missouri's rules and the federal ones.
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