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Sewage treatment plant, Mountain Lake Park, Maryland. NPDES permit MD0051497 expired Sep 30, 2016; its limits still apply. Last 12 months: over a limit 2 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | BOD, 5-day, 20 deg. C, maximum monthly average | 32 mg/L | ≤ 30 mg/L | 7% |
| February 2026 | E. coli, maximum monthly geometric mean | 376 MPN/100mL | ≤ 126 MPN/100mL | 198% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | monthly average | report only (deg F) | all year |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year |
| Oxygen, dissolved [DO] | daily average minimum | ≥ 6 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jun–Oct |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jun–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | Jun–Oct |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 230 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, 5-day, 20 deg. C | weekly average | report only (lb/d) | Jun–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 340 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| BOD, 5-day, 20 deg. C | daily average | report only (lb/d) | Jun–Oct |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | Jun–Oct |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | Jun–Oct |
| Solids, total suspended | monthly average | report only (lb/d) | Jun–Oct |
| Solids, total suspended | weekly average | report only (lb/d) | Jun–Oct |
| Solids, total suspended | daily average | report only (lb/d) | Jun–Oct |
| Solids, total suspended | maximum monthly average | ≤ 90 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Solids, total suspended | maximum monthly average | ≤ 680 lb/d | Jan, Feb, Mar, Apr, May, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, Kjeldahl, total [as N] | maximum monthly average | ≤ 15 mg/L | Jun–Oct |
| Nitrogen, Kjeldahl, total [as N] | maximum weekly average | ≤ 23 mg/L | Jun–Oct |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (lb/d) | Jun–Oct |
| Nitrogen, Kjeldahl, total [as N] | daily average | report only (lb/d) | Jun–Oct |
| Nitrogen, Kjeldahl, total [as N] | weekly maximum | report only (lb/d) | Jun–Oct |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Copper, total recoverable | monthly average | report only (ug/L) | all year |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year |
| Flow, in conduit or thru treatment plant | annual average | ≤ .9 MGD | all year |
| 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 | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | annual average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year |
| Flow, total | 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/MD0051497 · MCP: https://passage-data.com/mcp