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Sewage treatment plant, Huntsville, Missouri. NPDES permit MO0040819 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit 10 times (last June 2026), 1 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 22.1 | ≤ 12.1 mg/L | 83% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 12.13 | ≤ 3.1 mg/L | 291% |
| December 2025 | Oil and grease [soxhlet extr.] tot., daily maximum | 24.8 | ≤ 15 mg/L | 65% |
| December 2025 | Oil and grease [soxhlet extr.] tot., monthly average | 12.53 | ≤ 10 mg/L | 25% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 34.7 | ≤ 10.1 mg/L | 244% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 28.16 | ≤ 2.7 mg/L | 943% |
| April 2026 | E. coli, 30-day geometric mean | 857 | ≤ 206 #/100mL | 316% |
| May 2026 | E. coli, 30-day geometric mean | 258 | ≤ 206 #/100mL | 25% |
| June 2026 | E. coli, 30-day geometric mean | 556.71 | ≤ 206 #/100mL | 170% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | 18.8 | ≤ 1.8 mg/L | 944% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 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 | ≤ 120 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 80 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, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Apr–Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct–Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jan–Mar | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.8 mg/L | Apr–Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Oct–Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Jan–Mar | 001 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (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 | report only (mg/L) | all year | 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 | 7-day geometric mean | ≤ 1030 #/100mL | Apr–Dec | 001 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Dec | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year | 001 |
| 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 |
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/MO0040819 · MCP: https://passage-data.com/mcp