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Sewage treatment plant, major discharger, Perryville, Missouri. NPDES permit MO0051144, in force until Jun 30, 2029. Last 12 months: no values over a limit, 2 of 30 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | weekly average | ≤ 21.6 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 14.4 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 003 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | 003 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.2 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | Feb, Mar | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.4 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.4 mg/L | Jul, Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.2 mg/L | Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Nov | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.4 mg/L | Feb, Mar | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1 mg/L | Jul, Aug | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Dec | 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 |
| Cyanide, free [amenable to chlorination] | daily maximum | ≤ 9 ug/L | all year | 003 |
| Cyanide, free [amenable to chlorination] | monthly average | ≤ 4.5 ug/L | all year | 003 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 003 |
| Chloride [as Cl] | monthly average | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, total [as SO4] | monthly average | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | daily maximum | report only (mg/L) | all year | 003 |
| Fluoride, total [as F] | 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 |
| Cobalt, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Cobalt, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Thallium, total recoverable | daily maximum | report only (ug/L) | all year | 003 |
| Thallium, total recoverable | monthly average | report only (ug/L) | all year | 003 |
| Boron, total recoverable | daily maximum | report only (mg/L) | all year | 003 |
| Boron, total recoverable | monthly average | report only (mg/L) | all year | 003 |
| Zinc, total recoverable | daily maximum | ≤ 250.9 ug/L | all year | 003 |
| Zinc, total recoverable | monthly average | ≤ 125.1 ug/L | all year | 003 |
| Aluminum, total recoverable | daily maximum | ≤ 753.7 ug/L | all year | 003 |
| Aluminum, total recoverable | monthly average | ≤ 375.7 ug/L | all year | 003 |
| Lead, total recoverable | daily maximum | ≤ 13.8 ug/L | all year | 003 |
| Lead, total recoverable | monthly average | ≤ 6.9 ug/L | all year | 003 |
| Copper, total recoverable | daily maximum | ≤ 113.7 ug/L | all year | 003 |
| Copper, total recoverable | monthly average | ≤ 56.7 ug/L | all year | 003 |
| Phenol | daily maximum | report only (ug/L) | all year | 003 |
| Phenol | monthly average | report only (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 [acute], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 003 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 003 |
| p-Cresol | daily maximum | report only (ug/L) | all year | 003 |
| p-Cresol | monthly average | report only (ug/L) | all year | 003 |
| Benzoic acids, total | daily maximum | report only (ug/L) | all year | 003 |
| Benzoic acids, total | monthly average | report only (ug/L) | all year | 003 |
| .alpha.-Terpineol | daily maximum | report only (ug/L) | all year | 003 |
| .alpha.-Terpineol | monthly average | report only (ug/L) | all year | 003 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 14.4 mg/L | Jun–Sep | 003 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10.8 mg/L | Jun–Sep | 003 |
| BOD, carbonaceous [5 day, 5 C] | weekly average | ≤ 18 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 003 |
| BOD, carbonaceous [5 day, 5 C] | monthly average | ≤ 14.4 mg/L | Jan, Feb, Mar, Apr, May, Oct, Nov, Dec | 003 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| 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 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | INF |
Cited limits by parameter: Missouri's rules and the federal ones.
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