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Sewage treatment plant, Sudlersville, Maryland. NPDES permit MD0020559, in force until Dec 31, 2026. Last 12 months: over a limit 4 times (last December 2025). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | BOD, 5-day, 20 deg. C, maximum monthly average | 29.3 mg/L | ≤ 14 mg/L | 109% |
| November 2025 | BOD, 5-day, 20 deg. C, maximum weekly average | 60 mg/L | ≤ 21 mg/L | 186% |
| November 2025 | Nitrogen, total [as N], annual maximum | 2614 lb/yr | ≤ 2435 lb/yr | 7% |
| December 2025 | Nitrogen, total [as N], annual maximum | 3143 lb/yr | ≤ 2435 lb/yr | 29% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Evaporation Total | monthly average | report only (in/d) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Conductivity | monthly average | report only (umho/cm) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 14 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 11 mg/L | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 21 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 16 mg/L | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 23 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 18 lb/d | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 34 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 27 lb/d | May–Sep | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 50 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 75 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | EPA's "SEAN MAX" | ≤ 1217 lb/yr | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 2435 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | annual 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 | ≤ 1.9 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.2 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 9.3 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 6.5 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.2 lb/d | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.7 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 16 lb/d | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 11 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | May–Oct | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 183 lb/yr | all year | 001 |
| Phosphorus, total [as P] | EPA's "SEAN MAX" | ≤ 91 lb/yr | May–Oct | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Rainfall | monthly average | report only (in) | all year | 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 |
| 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 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Chlorine, total residual | maximum | < .1 mg/L | all year | 001 |
| Enterococci | maximum | ≤ 21 MPN/100mL | all year | 001 |
| Depth of pond or reservoir in feet | monthly average | report only (ft) | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| Flow, total | total | report only (Mgal/mo) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly total | report only (lb/yr) | all year | TRAD |
| Solids, total suspended | monthly total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | monthly total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | monthly total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | monthly total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | monthly total | report only (lb/yr) | all year | TRAD |
| Flow | year-to-date total | report only (Mgal/yr) | all year | TRAD |
Cited limits by parameter: Maryland's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/MD0020559 · MCP: https://passage-data.com/mcp