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Sewage treatment plant, Ridgely, Maryland. NPDES permit MD0020427 expired Aug 31, 2023; its limits still apply. Last 12 months: no values over a limit, 22 required values missing, 10 of 41 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | Jan–Mar | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 50 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 75 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | Jan–Mar | 001 |
| pH | maximum | ≤ 8 SU | Jan–Mar | 001 |
| Solids, total suspended | maximum monthly average | ≤ 90 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 150 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.3 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 10 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.5 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 17 lb/d | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan–Mar | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | Jan–Mar | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .02 mg/L | Jan–Mar | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| Turbidity, lab, NTU | maximum monthly average | ≤ 50 NTU | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 70 mg/L | all year | 002 |
| pH | minimum | ≥ 6.5 SU | all year | 002 |
| pH | maximum | ≤ 9.5 SU | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 90 mg/L | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 002 |
| Coliform, fecal general | maximum monthly average | < 200 MPN/100mL | all year | 002 |
| pH | value | report only (SU) | all year | MW1 |
| Nitrogen, total [as N] | value | report only (mg/L) | all year | MW1 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW1 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW1 |
| Chloride | value | report only (mg/L) | all year | MW1 |
| Solids, total dissolved | value | report only (mg/L) | all year | MW1 |
| Nitrogen, nitrate total [as NO3] | value | report only (mg/L) | all year | MW1 |
| Nitrogen, nitrite total [as NO2] | value | report only (mg/L) | all year | MW1 |
| Coliform, fecal general | value | report only (MPN/100mL) | all year | MW1 |
| pH | value | report only (SU) | all year | MW2 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year | MW2 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW2 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW2 |
| Chloride | maximum value | ≤ 250 mg/L | all year | MW2 |
| Solids, total dissolved | maximum value | ≤ 500 mg/L | all year | MW2 |
| Nitrogen, nitrate total [as NO3] | annual maximum | ≤ 10 mg/L | all year | MW2 |
| Nitrogen, nitrite total [as NO2] | annual maximum | ≤ 1 mg/L | all year | MW2 |
| Coliform, fecal general | maximum value | ≤ 2 MPN/100mL | all year | MW2 |
| pH | value | report only (SU) | all year | MW3 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year | MW3 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW3 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW3 |
| Chloride | maximum value | ≤ 250 mg/L | all year | MW3 |
| Solids, total dissolved | maximum value | ≤ 500 mg/L | all year | MW3 |
| Nitrogen, nitrate total [as NO3] | annual maximum | ≤ 10 mg/L | all year | MW3 |
| Nitrogen, nitrite total [as NO2] | annual maximum | ≤ 1 mg/L | all year | MW3 |
| Coliform, fecal general | maximum value | ≤ 2 MPN/100mL | all year | MW3 |
| pH | value | report only (SU) | all year | MW4 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year | MW4 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW4 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW4 |
| Chloride | maximum value | ≤ 250 mg/L | all year | MW4 |
| Solids, total dissolved | maximum value | ≤ 500 mg/L | all year | MW4 |
| Nitrogen, nitrate total [as NO3] | annual maximum | ≤ 10 mg/L | all year | MW4 |
| Nitrogen, nitrite total [as NO2] | annual maximum | ≤ 1 mg/L | all year | MW4 |
| Coliform, fecal general | maximum value | ≤ 2 MPN/100mL | all year | MW4 |
| pH | value | report only (SU) | all year | MW5 |
| Nitrogen, total [as N] | value | report only (mg/L) | all year | MW5 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW5 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW5 |
| Chloride | value | report only (mg/L) | all year | MW5 |
| Solids, total dissolved | value | report only (mg/L) | all year | MW5 |
| Nitrogen, nitrate total [as NO3] | value | report only (mg/L) | all year | MW5 |
| Nitrogen, nitrite total [as NO2] | value | report only (mg/L) | all year | MW5 |
| Coliform, fecal general | value | report only (MPN/100mL) | all year | MW5 |
| pH | value | report only (SU) | all year | MW6 |
| Nitrogen, total [as N] | value | report only (mg/L) | all year | MW6 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW6 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW6 |
| Chloride | value | report only (mg/L) | all year | MW6 |
| Solids, total dissolved | value | report only (mg/L) | all year | MW6 |
| Nitrogen, nitrate total [as NO3] | value | report only (mg/L) | all year | MW6 |
| Nitrogen, nitrite total [as NO2] | value | report only (mg/L) | all year | MW6 |
| Coliform, fecal general | value | report only (MPN/100mL) | all year | MW6 |
| pH | value | report only (SU) | all year | MW7 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year | MW7 |
| Nitrogen, Kjeldahl, total [as N] | value | report only (mg/L) | all year | MW7 |
| Phosphate, total [as PO4] | value | report only (mg/L) | all year | MW7 |
| Chloride | maximum value | ≤ 250 mg/L | all year | MW7 |
| Solids, total dissolved | maximum value | ≤ 500 mg/L | all year | MW7 |
| Nitrogen, nitrate total [as NO3] | annual maximum | ≤ 10 mg/L | all year | MW7 |
| Nitrogen, nitrite total [as NO2] | annual maximum | ≤ 1 mg/L | all year | MW7 |
| Coliform, fecal general | maximum value | ≤ 2 MPN/100mL | all year | MW7 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | SUM |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | SUM |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | SUM |
Cited limits by parameter: Maryland'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/MD0020427 · MCP: https://passage-data.com/mcp