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Sewage treatment plant, major discharger, Wentzville, Missouri. NPDES permit MO0093599 expired Mar 31, 2024; its limits still apply. Last 12 months: over a limit 2 times (last June 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Copper, total recoverable, monthly average | 15.3 | ≤ 12.2 ug/L | 25% |
| June 2026 | Copper, total recoverable, daily maximum | 29.4 | ≤ 24.4 ug/L | 20% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 27 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 18 mg/L | all year | 003 |
| pH | minimum | ≥ 6.5 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | weekly average | ≤ 41 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 27 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.5 mg/L | Apr–Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Apr–Sep | 003 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 003 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | daily maximum | ≤ 6.2 ug/L | all year | 003 |
| Selenium, total recoverable | monthly average | ≤ 3.1 ug/L | all year | 003 |
| Copper, total recoverable | daily maximum | ≤ 24.4 ug/L | all year | 003 |
| Copper, total recoverable | monthly average | ≤ 12.2 ug/L | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| E. coli | 7-day geometric mean | ≤ 1030 #/100mL | Apr–Oct | 003 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct | 003 |
| Toxicity [chronic], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 003 |
| Toxicity [chronic], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | 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 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | INF |
| Nitrogen, Kjeldahl, 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 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | SM2 |
| pH | daily maximum | report only (SU) | all year | SM2 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | SM2 |
Cited limits by parameter: Missouri's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
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