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Sewage treatment plant, Elkton, Maryland. NPDES permit MD0022641, in force until Jan 31, 2029. Last 12 months: over a limit once (last January 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit |
|---|---|---|---|
| January 2026 | pH, minimum | 6.4 SU | ≥ 6.5 SU |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 22 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 33 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly load | ≤ 128 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly load | ≤ 175 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 193 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | weekly maximum | ≤ 263 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly load | ≤ 175 lb/d | all year | 001 |
| Solids, total suspended | weekly maximum | ≤ 263 lb/d | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 20 mg/L | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 125 lb/d | 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 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.8 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 5.8 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 8.8 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.8 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 16 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 34 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 52 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 1.5 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 6.2 lb/d | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 8.8 lb/d | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | 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 |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year | 001 |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| Flow, total | monthly total | report only (Mgal/mo) | 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 |
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/MD0022641 · MCP: https://passage-data.com/mcp