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Sewage treatment plant, Catawissa, Missouri. NPDES permit MO0115410, in force until Dec 31, 2029. Last 12 months: over a limit 11 times (last May 2026), 4 of 41 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], monthly average | 10.23 | ≤ 2.7 mg/L | 279% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | 3.34 | ≤ 2.7 mg/L | 24% |
| January 2026 | Nitrogen, ammonia total [as N], monthly average | 10.2 | ≤ 2.7 mg/L | 278% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 15.54 | ≤ 10.9 mg/L | 43% |
| February 2026 | Nitrogen, ammonia total [as N], monthly average | 12.4 | ≤ 2.7 mg/L | 359% |
| March 2026 | Nitrogen, ammonia total [as N], daily maximum | 15.56 | ≤ 10.9 mg/L | 43% |
| March 2026 | Nitrogen, ammonia total [as N], monthly average | 10.1 | ≤ 2.7 mg/L | 274% |
| April 2026 | Chlorine, total residual, daily maximum | 330 | ≤ 18 ug/L | 1733% |
| April 2026 | Chlorine, total residual, monthly average | 315 | ≤ 9 ug/L | 3400% |
| May 2026 | Chlorine, total residual, daily maximum | 270 | ≤ 18 ug/L | 1400% |
| May 2026 | Chlorine, total residual, monthly average | 150 | ≤ 9 ug/L | 1567% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | daily minimum | report only (mg/L) | Apr–Oct | 002 |
| Oxygen, dissolved [DO] | monthly average minimum | report only (mg/L) | Apr–Oct | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 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 | ≤ 10.9 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 5.3 mg/L | Apr–Sep | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.7 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.3 mg/L | Apr–Sep | 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 |
| Chlorine, total residual | daily maximum | ≤ 18 ug/L | Apr–Oct | 002 |
| Chlorine, total residual | monthly average | ≤ 9 ug/L | Apr–Oct | 002 |
| E. coli | 7-day geometric mean | ≤ 630 #/100mL | Apr–Oct | 002 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 002 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (toxic) | all year | 002 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (toxic) | all year | 002 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | INF |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | INF |
| Solids, total suspended | daily maximum | 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 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | IP1 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | IP1 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | IP1 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | IP1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | IP1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | IP1 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | IP1 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | IP1 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | IP2 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | IP2 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | IP2 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | IP2 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | IP2 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | IP2 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | IP2 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | IP2 |
Cited limits by parameter: Missouri's rules and the federal ones.
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