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Sewage treatment plant, major discharger, Aberdeen, Maryland. NPDES permit MD0021563, in force until Feb 28, 2027. Last 12 months: over a limit 4 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Phosphorus, total [as P], maximum monthly average | .68 mg/L | ≤ .65 mg/L | 5% |
| June 2026 | Phosphorus, total [as P], maximum weekly average | 1.63 mg/L | ≤ 1 mg/L | 63% |
| July 2026 | Phosphorus, total [as P], maximum monthly average | 1.14 mg/L | ≤ .65 mg/L | 75% |
| July 2026 | Phosphorus, total [as P], maximum weekly average | 1.92 mg/L | ≤ 1 mg/L | 92% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 7 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 20 mg/L | May–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 30 mg/L | May–Oct |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 1000 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 670 lb/d | May–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1500 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1000 lb/d | May–Oct |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | maximum monthly average | ≤ 1000 lb/d | all year |
| Solids, total suspended | maximum weekly average | ≤ 1500 lb/d | all year |
| Solids, total suspended | cumulative total | ≤ 365467 lb/yr | all year |
| Solids, total suspended | monthly total | report only (lb/mo) | all year |
| Nitrogen, total [as N] | maximum monthly average | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | maximum weekly average | ≤ 15 mg/L | all year |
| Nitrogen, total [as N] | maximum monthly average | ≤ 334 lb/d | all year |
| Nitrogen, total [as N] | maximum weekly average | ≤ 500 lb/d | all year |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year |
| Nitrogen, total [as N] | cumulative total | ≤ 48729 lb/yr | all year |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.2 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 14.4 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 14.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 40 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 113 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 480 lb/d | May–Oct |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 480 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | maximum monthly average | ≤ .65 mg/L | all year |
| Phosphorus, total [as P] | maximum weekly average | ≤ 1 mg/L | all year |
| Phosphorus, total [as P] | maximum monthly average | ≤ 22 lb/d | all year |
| Phosphorus, total [as P] | cumulative total | ≤ 3655 lb/yr | all year |
| Phosphorus, total [as P] | maximum weekly average | ≤ 33 lb/d | all year |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year |
| Zinc, total recoverable | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec |
| Lead, total recoverable | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec |
| Copper, total recoverable | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year |
| Di[2-ethylhexyl] phthalate [DEHP] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | annual total | report only (Mgal/yr) | all year |
| Flow, in conduit or thru treatment plant | annual total | report only (Mgal/yr) | all year |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year |
| Flow, total | monthly total | report only (Mgal/mo) | all year |
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/MD0021563 · MCP: https://passage-data.com/mcp