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Sewage treatment plant, major discharger, Neosho, Missouri. NPDES permit MO0104906 expired Apr 30, 2022; its limits still apply. Last 12 months: over a limit 16 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| October 2025 | 001 | E. coli, 30-day geometric mean | 6127.93 | ≤ 126 #/100mL | 4763% |
| October 2025 | 001 | E. coli, 7-day geometric mean | 11199 | ≤ 630 #/100mL | 1678% |
| February 2026 | 001 | Nitrogen, ammonia total [as N], monthly average | 2.825 | ≤ 2.2 mg/L | 28% |
| March 2026 | IP5 | Solids, suspended percent removal, monthly average minimum | 75 | ≥ 85 % | 67% |
| April 2026 | 001 | E. coli, 30-day geometric mean | 289 | ≤ 126 #/100mL | 129% |
| April 2026 | 001 | E. coli, 7-day geometric mean | 14136 | ≤ 630 #/100mL | 2144% |
| May 2026 | 001 | E. coli, 7-day geometric mean | 24196 | ≤ 630 #/100mL | 3741% |
| May 2026 | 001 | Nitrogen, ammonia total [as N], daily maximum | 9.8 | ≤ 6.1 mg/L | 61% |
| May 2026 | 001 | Nitrogen, ammonia total [as N], monthly average | 4.9 | ≤ 1.2 mg/L | 308% |
| June 2026 | 001 | E. coli, 30-day geometric mean | 1087 | ≤ 126 #/100mL | 763% |
| June 2026 | 001 | E. coli, 7-day geometric mean | 10462 | ≤ 630 #/100mL | 1561% |
| July 2026 | 001 | E. coli, 30-day geometric mean | 4198 | ≤ 126 #/100mL | 3232% |
| July 2026 | 001 | E. coli, 7-day geometric mean | 24196 | ≤ 630 #/100mL | 3741% |
| August 2026 | 001 | E. coli, 30-day geometric mean | > 2419.6 | ≤ 126 #/100mL | — |
| August 2026 | 001 | E. coli, 7-day geometric mean | > 2419.6 | ≤ 630 #/100mL | — |
| August 2026 | 001 | Nitrogen, ammonia total [as N], monthly average | 2.18 | ≤ 1.2 mg/L | 82% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | 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 | ≤ 11.9 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 6.1 mg/L | Apr–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.2 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.2 mg/L | Apr–Sep | 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 |
| Iron, total recoverable | daily maximum | ≤ 1849.6 ug/L | all year | 001 |
| Iron, total recoverable | monthly average | ≤ 702.5 ug/L | all year | 001 |
| Selenium, total recoverable | daily maximum | ≤ 9.2 ug/L | all year | 001 |
| Selenium, total recoverable | monthly average | ≤ 3.2 ug/L | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Nickel, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | ≤ .6 ug/L | all year | 001 |
| Cadmium, total recoverable | monthly average | ≤ .3 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | report only (ug/L) | all year | 001 |
| Chromium, trivalent total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Chromium, trivalent total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Phenol | daily maximum | ≤ 4200.5 ug/L | all year | 001 |
| Phenol | monthly average | ≤ 1316.3 ug/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 | ≤ 630 #/100mL | Apr–Oct | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | Apr–Oct | 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 |
| Mercury, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Mercury, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 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 | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | 002 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 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 | ≤ 7.5 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Apr–Sep | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 002 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Apr–Sep | 002 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (lb/d) | all year | 002 |
| Cyanide, free [amenable to chlorination] | daily maximum | ≤ 8.2 ug/L | all year | 002 |
| Cyanide, free [amenable to chlorination] | monthly average | ≤ 4.1 ug/L | all year | 002 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 002 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | ≤ 502.5 ug/L | all year | 002 |
| Sulfate, total [as SO4] | monthly average | ≤ 250 ug/L | all year | 002 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Boron, dissolved [as B] | daily maximum | ≤ 4020 ug/L | all year | 002 |
| Boron, dissolved [as B] | monthly average | ≤ 2000 ug/L | all year | 002 |
| Nickel, total recoverable | daily maximum | ≤ 128.9 ug/L | all year | 002 |
| Nickel, total recoverable | monthly average | ≤ 64.3 ug/L | all year | 002 |
| Zinc, total recoverable | daily maximum | ≤ 180.7 ug/L | all year | 002 |
| Zinc, total recoverable | monthly average | ≤ 90.1 ug/L | all year | 002 |
| Cadmium, total recoverable | daily maximum | ≤ .6 ug/L | all year | 002 |
| Cadmium, total recoverable | monthly average | ≤ .3 ug/L | all year | 002 |
| Lead, total recoverable | daily maximum | ≤ 9.7 ug/L | all year | 002 |
| Lead, total recoverable | monthly average | ≤ 4.8 ug/L | all year | 002 |
| Copper, total recoverable | daily maximum | ≤ 22 ug/L | all year | 002 |
| Copper, total recoverable | monthly average | ≤ 11 ug/L | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 15 ug/L | all year | 002 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 7.5 ug/L | all year | 002 |
| Chromium, trivalent total recoverable | daily maximum | ≤ 210.2 ug/L | all year | 002 |
| Chromium, trivalent total recoverable | monthly average | ≤ 104.8 ug/L | all year | 002 |
| 1,2-Dichloroethane | daily maximum | ≤ 10.05 ug/L | all year | 002 |
| 1,2-Dichloroethane | monthly average | ≤ 5 ug/L | all year | 002 |
| 1,1,1-Trichloroethane | daily maximum | ≤ 402 ug/L | all year | 002 |
| 1,1,1-Trichloroethane | monthly average | ≤ 200 ug/L | all year | 002 |
| 1,1,2-Trichloroethane | daily maximum | ≤ 10.05 ug/L | all year | 002 |
| 1,1,2-Trichloroethane | monthly average | ≤ 5 ug/L | all year | 002 |
| Phenol | daily maximum | ≤ 201 ug/L | all year | 002 |
| Phenol | monthly average | ≤ 100 ug/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 | ≤ 17 ug/L | all year | 002 |
| Chlorine, total residual | monthly average | ≤ 8 ug/L | all year | 002 |
| E. coli | daily maximum | ≤ 126 #/100mL | all year | 002 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 002 |
| Mercury, total recoverable | daily maximum | ≤ .8 ug/L | all year | 002 |
| Mercury, total recoverable | monthly average | ≤ .4 ug/L | all year | 002 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 15 mg/L | all year | IP2 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 10 mg/L | all year | IP2 |
| pH | minimum | ≥ 6.5 SU | all year | IP2 |
| pH | maximum | ≤ 9 SU | all year | IP2 |
| Solids, total suspended | weekly average | ≤ 20 mg/L | all year | IP2 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | all year | IP2 |
| Oil and grease [soxhlet extr.] tot. | daily maximum | ≤ 15 mg/L | all year | IP2 |
| Oil and grease [soxhlet extr.] tot. | monthly average | ≤ 10 mg/L | all year | IP2 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | IP2 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | IP2 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 3.6 mg/L | Apr–Sep | IP2 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 7.5 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | IP2 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.4 mg/L | Apr–Sep | IP2 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.9 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | IP2 |
| Nitrogen, nitrate total [as N] | daily maximum | report only (mg/L) | all year | IP2 |
| Nitrogen, nitrate total [as N] | monthly average | report only (mg/L) | all year | IP2 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | IP2 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | IP2 |
| Cyanide, free [amenable to chlorination] | daily maximum | ≤ 8.2 ug/L | all year | IP2 |
| Cyanide, free [amenable to chlorination] | monthly average | ≤ 4.1 ug/L | all year | IP2 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | IP2 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | IP2 |
| Sulfate, total [as SO4] | daily maximum | ≤ 502.5 ug/L | all year | IP2 |
| Sulfate, total [as SO4] | monthly average | ≤ 250 ug/L | all year | IP2 |
| Iron, total recoverable | daily maximum | report only (ug/L) | all year | IP2 |
| Iron, total recoverable | monthly average | report only (ug/L) | all year | IP2 |
| Selenium, total recoverable | daily maximum | report only (ug/L) | all year | IP2 |
| Selenium, total recoverable | monthly average | report only (ug/L) | all year | IP2 |
| Boron, dissolved [as B] | daily maximum | ≤ 4020 ug/L | all year | IP2 |
| Boron, dissolved [as B] | monthly average | ≤ 2000 ug/L | all year | IP2 |
| Nickel, total recoverable | daily maximum | ≤ 128.9 ug/L | all year | IP2 |
| Nickel, total recoverable | monthly average | ≤ 64.3 ug/L | all year | IP2 |
| Zinc, total recoverable | daily maximum | ≤ 180.7 ug/L | all year | IP2 |
| Zinc, total recoverable | monthly average | ≤ 90.1 ug/L | all year | IP2 |
| Cadmium, total recoverable | daily maximum | ≤ .6 ug/L | all year | IP2 |
| Cadmium, total recoverable | monthly average | ≤ .3 ug/L | all year | IP2 |
| Lead, total recoverable | daily maximum | ≤ 9.7 ug/L | all year | IP2 |
| Lead, total recoverable | monthly average | ≤ 4.8 ug/L | all year | IP2 |
| Copper, total recoverable | daily maximum | ≤ 22 ug/L | all year | IP2 |
| Copper, total recoverable | monthly average | ≤ 11 ug/L | all year | IP2 |
| Chromium, hexavalent dissolved [as Cr] | daily maximum | ≤ 15 ug/L | all year | IP2 |
| Chromium, hexavalent dissolved [as Cr] | monthly average | ≤ 7.5 ug/L | all year | IP2 |
| Chromium, trivalent total recoverable | daily maximum | ≤ 210.2 ug/L | all year | IP2 |
| Chromium, trivalent total recoverable | monthly average | ≤ 104.8 ug/L | all year | IP2 |
| 1,2-Dichloroethane | daily maximum | ≤ 10.05 ug/L | all year | IP2 |
| 1,2-Dichloroethane | monthly average | ≤ 5 ug/L | all year | IP2 |
| 1,1,1-Trichloroethane | daily maximum | ≤ 402 ug/L | all year | IP2 |
| 1,1,1-Trichloroethane | monthly average | ≤ 200 ug/L | all year | IP2 |
| 1,1,2-Trichloroethane | daily maximum | ≤ 10.05 ug/L | all year | IP2 |
| 1,1,2-Trichloroethane | monthly average | ≤ 5 ug/L | all year | IP2 |
| Phenol | daily maximum | ≤ 201 ug/L | all year | IP2 |
| Phenol | monthly average | ≤ 100 ug/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 |
| Chlorine, total residual | daily maximum | ≤ 17 ug/L | all year | IP2 |
| Chlorine, total residual | monthly average | ≤ 8 ug/L | all year | IP2 |
| E. coli | daily maximum | ≤ 126 #/100mL | all year | IP2 |
| E. coli | monthly average | report only (#/100mL) | all year | IP2 |
| Mercury, total recoverable | daily maximum | ≤ .8 ug/L | all year | IP2 |
| Mercury, total recoverable | monthly average | ≤ .4 ug/L | all year | IP2 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 65 mg/L | all year | IP3 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 45 mg/L | all year | IP3 |
| pH | minimum | ≥ 6 SU | all year | IP3 |
| pH | maximum | ≤ 9 SU | all year | IP3 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | IP3 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | IP3 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | IP3 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | IP3 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | IP3 |
| Solids, suspended percent removal | monthly average minimum | ≥ 65 % | all year | IP3 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | IP5 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | IP5 |
| pH | minimum | ≥ 6 SU | all year | IP5 |
| pH | maximum | ≤ 9 SU | all year | IP5 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | IP5 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | IP5 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | IP5 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | IP5 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | IP5 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | IP5 |
| 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 |
| Hardness, total [as CaCO3] | daily maximum | report only (mg/L) | all year | SM2 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | SM2 |
Cited limits by parameter: Missouri's rules and the federal ones.
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