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Sewage treatment plant, Richland, Missouri. NPDES permit MO0023299 expired Sep 30, 2021; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 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 | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 2.8 mg/L | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.4 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (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 | report only (MGD) | all year | 001 |
| E. coli | daily maximum | report only (#/100mL) | all year | 001 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Rainfall | total | report only (in) | all year | 003 |
| Rainfall | monthly total | report only (in) | all year | 003 |
| Depth to water level ft below landsurface | daily minimum | report only (ft) | all year | 003 |
| Application rate area sprayed | total | report only (acr) | all year | 004 |
| Application rate area sprayed | monthly total | report only (acr) | all year | 004 |
| Application rate, gallons spray irrigation | total | report only (gal) | all year | 004 |
| Application rate, gallons spray irrigation | monthly total | report only (gal) | all year | 004 |
| Spray irrigation | total | report only (hr/d) | all year | 004 |
| Spray irrigation | monthly total | report only (hr/d) | all year | 004 |
| Spray irrigation, application rate | total | report only (in/d) | all year | 004 |
| Spray irrigation, application rate | monthly total | report only (in/d) | all year | 004 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | SM1 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | SM1 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | SM1 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | SM1 |
Cited limits by parameter: Missouri'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/MO0023299 · MCP: https://passage-data.com/mcp