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Sewage treatment plant, Ironton, Missouri. NPDES permit MO0026514, in force until Oct 31, 2030. Last 12 months: over a limit 20 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Nitrogen, ammonia total [as N], daily maximum | 15.4 | ≤ 10.6 mg/L | 45% |
| November 2025 | Nitrogen, ammonia total [as N], monthly average | 15.4 | ≤ 5.3 mg/L | 191% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 14.8 | ≤ 10.6 mg/L | 40% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 14.8 | ≤ 5.3 mg/L | 179% |
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 19 | ≤ 10.6 mg/L | 79% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 17.7 | ≤ 5.3 mg/L | 234% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 10.8 | ≤ 10.6 mg/L | 2% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 10.34 | ≤ 5.3 mg/L | 95% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 5.55 | ≤ 5.3 mg/L | 5% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 3.36 | ≤ 2.5 mg/L | 34% |
| June 2026 | E. coli, 30-day geometric mean | 238.4 | ≤ 206 #/100mL | 16% |
| June 2026 | E. coli, daily maximum | > 2419.6 | ≤ 1030 #/100mL | — |
| June 2026 | Nitrogen, ammonia total [as N], daily maximum | 7.8 | ≤ 5 mg/L | 56% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 6.78 | ≤ 2.5 mg/L | 171% |
| July 2026 | E. coli, 30-day geometric mean | 460.1 | ≤ 206 #/100mL | 123% |
| July 2026 | Nitrogen, ammonia total [as N], monthly average | 2.53 | ≤ 2.5 mg/L | 1% |
| July 2026 | pH, maximum | 9.18 | ≤ 9 SU | — |
| August 2026 | E. coli, 30-day geometric mean | 291.8 | ≤ 206 #/100mL | 42% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 2.51 | ≤ 2.5 mg/L | 0% |
| August 2026 | pH, maximum | 9.26 | ≤ 9 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | Apr–Oct | 001 |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | Apr–Oct | 001 |
| 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 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | weekly average | ≤ 110 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 70 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] | annual average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (lb/wk) | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/wk) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.3 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | annual average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (lb/wk) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly total | report only (lb/wk) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | annual average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (lb/wk) | all year | 001 |
| Nitrite + Nitrate total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly total | report only (lb/wk) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | annual average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (lb/wk) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/wk) | 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 | ≤ 1030 #/100mL | Apr–Oct | 001 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct | 001 |
| Flow, total | monthly total | report only (MGD) | all year | 001 |
| Rainfall | total | report only (in) | all year | 002 |
| Rainfall | monthly total | report only (in) | all year | 002 |
| Freeboard | total | report only (ft) | all year | 002 |
| Rainfall | total | report only (in) | all year | 003 |
| Rainfall | monthly total | report only (in) | all year | 003 |
| Freeboard | total | report only (ft) | all year | 003 |
| Application rate area sprayed | total | report only (acr) | all year | 005 |
| Application rate area sprayed | monthly total | report only (acr) | all year | 005 |
| E. coli | daily maximum | ≤ 126 #/100mL | all year | 005 |
| Application rate, gallons spray irrigation | total | report only (gal) | all year | 005 |
| Application rate, gallons spray irrigation | monthly total | report only (gal) | all year | 005 |
| Spray irrigation | total | report only (hr/d) | all year | 005 |
| Spray irrigation | monthly total | report only (hr/d) | all year | 005 |
| Spray irrigation, application rate | total | report only (in/d) | all year | 005 |
| Spray irrigation, application rate | monthly total | report only (in/d) | all year | 005 |
| 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 |
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/MO0026514 · MCP: https://passage-data.com/mcp