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Sewage treatment plant, Unionville, Missouri. NPDES permit MO0054569, in force until Apr 30, 2029. Last 12 months: over a limit 19 times (last July 2026), 4 of 56 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| December 2025 | 002 | Nitrogen, ammonia total [as N], daily maximum | 14.4 | ≤ 10.1 mg/L | 43% |
| December 2025 | 002 | Nitrogen, ammonia total [as N], monthly average | 14.4 | ≤ 2.7 mg/L | 433% |
| December 2025 | 003 | Nitrogen, ammonia total [as N], daily maximum | 12.4 | ≤ 10.1 mg/L | 23% |
| December 2025 | 003 | Nitrogen, ammonia total [as N], monthly average | 12.4 | ≤ 2.7 mg/L | 359% |
| March 2026 | 002 | Nitrogen, ammonia total [as N], daily maximum | 14.4 | ≤ 10.1 mg/L | 43% |
| March 2026 | 002 | Nitrogen, ammonia total [as N], monthly average | 14.4 | ≤ 2.7 mg/L | 433% |
| March 2026 | 003 | Nitrogen, ammonia total [as N], daily maximum | 11.3 | ≤ 10.1 mg/L | 12% |
| March 2026 | 003 | Nitrogen, ammonia total [as N], monthly average | 11.3 | ≤ 2.7 mg/L | 319% |
| May 2026 | 002 | E. coli, 30-day geometric mean | 223 | ≤ 206 #/100mL | 8% |
| May 2026 | 003 | E. coli, 30-day geometric mean | 454 | ≤ 206 #/100mL | 120% |
| June 2026 | 002 | E. coli, 30-day geometric mean | 261 | ≤ 206 #/100mL | 27% |
| June 2026 | 002 | Nitrogen, ammonia total [as N], monthly average | 3.69 | ≤ 1.5 mg/L | 146% |
| June 2026 | 003 | E. coli, 30-day geometric mean | 649 | ≤ 206 #/100mL | 215% |
| July 2026 | 002 | E. coli, 30-day geometric mean | 2419 | ≤ 206 #/100mL | 1074% |
| July 2026 | 002 | E. coli, 7-day geometric mean | 2419 | ≤ 1030 #/100mL | 135% |
| July 2026 | 002 | Nitrogen, ammonia total [as N], monthly average | 7.66 | ≤ 1.1 mg/L | 596% |
| July 2026 | 003 | E. coli, 30-day geometric mean | 2419 | ≤ 206 #/100mL | 1074% |
| July 2026 | 003 | E. coli, 7-day geometric mean | 2419 | ≤ 1030 #/100mL | 135% |
| July 2026 | 003 | Nitrogen, ammonia total [as N], monthly average | 7.53 | ≤ 1.1 mg/L | 585% |
| 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 | ≤ 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 | report only (mg/L) | all year | 001 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (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 | ≤ 12.1 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Nov | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Apr | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Feb, Mar, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Aug | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Nov | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jul | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Apr | 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–Oct | 001 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct | 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 | weekly average | ≤ 65 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | weekly average | ≤ 110 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 70 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | report only (mg/L) | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Feb, Mar, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Nov | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jul | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | Sep | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Aug | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Feb, Mar, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Oct | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Nov | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Apr | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | May | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jul | 002 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| E. coli | 7-day geometric mean | ≤ 1030 #/100mL | Apr–Oct | 002 |
| E. coli | 30-day geometric mean | ≤ 206 #/100mL | Apr–Oct | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 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 | ≤ 110 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 70 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, 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 | ≤ 12.1 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Feb, Mar, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 12.1 mg/L | Jan, Nov | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 10.1 mg/L | Jul | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.7 mg/L | Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.9 mg/L | May | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | Jun | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Feb, Mar, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.6 mg/L | Oct | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Aug | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.3 mg/L | Apr | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3.1 mg/L | Jan, Nov | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.1 mg/L | Jul | 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 |
| 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 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | 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 |
Cited limits by parameter: Missouri's rules and the federal ones.
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