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Sewage treatment plant, major discharger, Oswego, New York. NPDES permit NY0029106, in force until Apr 30, 2031. Last 12 months: over a limit 9 times (last April 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Solids, settleable, daily maximum | .7 mL/L | ≤ .3 mL/L | 133% |
| January 2026 | Flow, in conduit or thru treatment plant, monthly average | 4.15 MGD | ≤ 4 MGD | 4% |
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 78 % | ≥ 85 % | 47% |
| March 2026 | Flow, in conduit or thru treatment plant, monthly average | 5.66 MGD | ≤ 4 MGD | 42% |
| March 2026 | Solids, settleable, daily maximum | 1.2 mL/L | ≤ .3 mL/L | 300% |
| March 2026 | Solids, total suspended, 7-day average | 1754 lb/d | ≤ 1502 lb/d | 17% |
| April 2026 | Flow, in conduit or thru treatment plant, monthly average | 4.99 MGD | ≤ 4 MGD | 25% |
| April 2026 | Solids, settleable, daily maximum | .7 mL/L | ≤ .3 mL/L | 133% |
| April 2026 | Solids, total suspended, 7-day average | 1754 lb/d | ≤ 1502 lb/d | 17% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 2000 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 3000 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 2000 lb/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 3000 lb/d | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, settleable | daily maximum | ≤ .3 mL/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.9 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 7.2 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 19 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 001 |
| Copper, total [as Cu] | daily maximum | ≤ 150 ug/L | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 001 |
| Zinc, total recoverable | daily maximum | ≤ 1.3 mg/L | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (lb/d) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | ≤ 93 ug/L | all year | 001 |
| Lead, total recoverable | daily maximum | report only (lb/d) | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | ≤ 3.34 lb/d (alert, not enforceable) | all year | 001 |
| Di[2-ethylhexyl] phthalate [DEHP] | daily maximum | report only (ug/L) | all year | 001 |
| Phenols | monthly average | report only (ug/L) | all year | 001 |
| Phenols | monthly average | report only (lb/d) | all year | 001 |
| Phenols | monthly average | ≤ 10 ug/L | all year | 001 |
| Phenols | monthly average | ≤ .67 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ 8 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .25 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | report only (#/100mL) | all year | 001 |
| E. coli | 7-day geometric mean | report only (#/100mL) | all year | 001 |
| Perfluorooctanoic acid (PFOA) | daily maximum | ≤ 10 ng/L (alert, not enforceable) | all year | 001 |
| Perfluorobutanoic acid (PFBA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonamide (PFOSA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoropentanoic acid (PFPeA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorohexanoic acid (PFHxA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoroheptanoic acid (PFHpA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorononanoic acid (PFNA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorodecanoic acid (PFDA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoroundecanoic acid (PFUnA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorododecanoic acid (PFDoA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorotridecanoic acid (PFTrDA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorotetradecanoic acid (PFTeDA) | daily maximum | report only (ng/L) | all year | 001 |
| N-ethyl perfluorooctanesulfonamidoethanol (NEtFOSE) | daily maximum | report only (ng/L) | all year | 001 |
| N-methyl perfluorooctanesulfonamidoethanol (NMeFOSE) | daily maximum | report only (ng/L) | all year | 001 |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | daily maximum | report only (ng/L) | all year | 001 |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorodecanesulfonic acid (PFDS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoroheptanesulfonic acid (PFHpS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorohexanesulfonic acid (PFHxS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonic acid (PFOS) | daily maximum | ≤ 10 ng/L (alert, not enforceable) | all year | 001 |
| 1H,1H,2H,2H-Perfluorohexane sulfonic acid (4:2 FTS) | daily maximum | report only (ng/L) | all year | 001 |
| 1H,1H,2H,2H-Perfluorooctane sulfonic acid (6:2 FTS) | daily maximum | report only (ng/L) | all year | 001 |
| 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid (8:2 FTS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoropentanesulfonic acid (PFPeS) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorononanesulfonic acid (PFNS) | daily maximum | report only (ng/L) | all year | 001 |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | 001 |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoro(2-ethoxyethane)sulfonic acid (PFEESA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorododecanesulfonic acid (PFDoS) | daily maximum | report only (ng/L) | all year | 001 |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | daily maximum | report only (ng/L) | all year | 001 |
| N-methyl perfluorooctanesulfonamide (NMeFOSA) | daily maximum | report only (ng/L) | all year | 001 |
| N-ethyl perfluorooctanesulfonamide (NEtFOSA) | daily maximum | report only (ng/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | ≤ 50 ng/L | all year | 001 |
| Coliform, fecal general | 30-day geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| 3-Perfluoropropyl propanoic acid (3:3 FTCA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | daily maximum | report only (ng/L) | all year | 001 |
| 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acid (9Cl-PF3ONS) | daily maximum | report only (ng/L) | all year | 001 |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | daily maximum | report only (ng/L) | all year | 001 |
| 3-Perfluoroheptyl propanoic acid (7:3 FTCA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | daily maximum | report only (ng/L) | all year | 001 |
| 2H,2H,3H,3H-Perfluorooctanoic acid (5:3 FTCA) | daily maximum | report only (ng/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 002 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 002 |
| Floating solids, waste or visible foam-visual | EPA's "NONSP MX" | report only (N=0;Y=1) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | 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 total | report only (Mgal/mo) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 2 mg/L | all year | 002 |
| Coliform, fecal general | 30-day geometric mean | ≤ 200 #/100mL | all year | 002 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year | 002 |
Cited limits by parameter: New York's rules and the federal ones.
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