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Sewage treatment plant, Mayville, New York. NPDES permit NY0020826 expired Mar 31, 2020; its limits still apply. Last 12 months: over a limit 7 times (last September 2026), 4 of 48 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Phosphorus, total [as P], year-to-date total | 349.62 lb/yr | ≤ 339.5 lb/yr | 3% |
| March 2026 | Flow, in conduit or thru treatment plant, monthly average | .5969 MGD | ≤ .5 MGD | 19% |
| March 2026 | Phosphorus, total [as P], year-to-date total | 361.86 lb/yr | ≤ 339.5 lb/yr | 7% |
| April 2026 | Flow, in conduit or thru treatment plant, monthly average | .5776 MGD | ≤ .5 MGD | 16% |
| April 2026 | Phosphorus, total [as P], year-to-date total | 374.43 lb/yr | ≤ 339.5 lb/yr | 10% |
| July 2026 | Nitrogen, ammonia, total [as NH3], monthly average | 16.6 mg/L | ≤ 4.9 mg/L | 239% |
| September 2026 | Phosphorus, total [as P], year-to-date total | 340.03 lb/yr | ≤ 339.5 lb/yr | 0% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | 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 | ≤ 125 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 188 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| pH | minimum | report only (SU) | all year | 001 |
| pH | maximum | report only (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 | ≤ 125 lb/d | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 188 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 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 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 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | year-to-date total | ≤ 339.5 lb/yr | all year | 001 |
| Total agg concentration #1 | year-to-date total | ≤ 375.6 lb/yr | all year | 001 |
| Total agg concentration #1 | year-to-date total | report only (lb/yr) | all year | 001 |
| Nitrogen, ammonia, total [as NH3] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia, total [as NH3] | monthly average | ≤ 4.9 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia, total [as NH3] | monthly average | ≤ 7.6 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| Nitrogen, ammonia, total [as NH3] | monthly average | report only (mg/L) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ .5 MGD | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ 2 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/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 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 125 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 188 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| pH | minimum | report only (SU) | all year | 002 |
| pH | maximum | report only (SU) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 125 lb/d | all year | 002 |
| Solids, total suspended | 7-day average | ≤ 188 lb/d | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, settleable | daily maximum | ≤ .3 mL/L | all year | 002 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | year-to-date total | ≤ 339.5 lb/yr | all year | 002 |
| Total agg concentration #1 | year-to-date total | ≤ 375.6 lb/yr | all year | 002 |
| Total agg concentration #1 | year-to-date total | report only (lb/yr) | all year | 002 |
| Nitrogen, ammonia, total [as NH3] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia, total [as NH3] | monthly average | ≤ 4.9 mg/L | Jun, Jul, Aug, Sep, Oct, Dec | 002 |
| Nitrogen, ammonia, total [as NH3] | monthly average | ≤ 7.6 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 002 |
| Nitrogen, ammonia, total [as NH3] | monthly average | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | ≤ .5 MGD | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ 2 mg/L | all year | 002 |
| Chlorine, total residual | daily maximum | ≤ .1 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 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 003 |
| pH | minimum | report only (SU) | all year | 003 |
| pH | maximum | report only (SU) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, settleable | daily maximum | report only (mL/L) | all year | 003 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | year-to-date total | ≤ 339.5 lb/yr | all year | 003 |
| Total agg concentration #1 | year-to-date total | ≤ 375.6 lb/yr | all year | 003 |
| Total agg concentration #1 | year-to-date total | report only (lb/yr) | all year | 003 |
| Nitrogen, ammonia, total [as NH3] | monthly average | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 003 |
| Coliform, fecal general | 30-day geometric mean | ≤ 200 #/100mL | all year | 003 |
| Coliform, fecal general | 7-day geometric mean | ≤ 400 #/100mL | all year | 003 |
| Phosphorus, total [as P] | year-to-date total | report only (lb/yr) (alert, not enforceable) | all year | SUM |
| Total agg concentration #1 | year-to-date total | report only (lb/yr) (alert, not enforceable) | all year | SUM |
Cited limits by parameter: New York'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/NY0020826 · MCP: https://passage-data.com/mcp