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Water Supply, Frederick, Maryland. NPDES permit MD0061841, in force until Nov 30, 2030. Last 12 months: over a limit 3 times (last August 2026), 64 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Aluminum, total recoverable, daily maximum | 13.6 mg/L | ≤ 6 mg/L | 127% |
| October 2025 | Solids, total suspended, daily maximum | 81 mg/L | ≤ 30 mg/L | 170% |
| August 2026 | Oxygen, dissolved [DO], instantaneous minimum | 4.4 mg/L | ≥ 5 mg/L | 12% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | monthly average | report only (mg/L) | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 20 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly load | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | monthly load | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 0 lb/yr | Dec | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, organic total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | monthly load | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | monthly load | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 0 lb/yr | Dec | 001 |
| Iron, total [as Fe] | maximum monthly average | ≤ 4 mg/L | all year | 001 |
| Iron, total [as Fe] | daily maximum | ≤ 6 mg/L | all year | 001 |
| Aluminum, total recoverable | maximum monthly average | ≤ 4 mg/L | all year | 001 |
| Aluminum, total recoverable | daily maximum | ≤ 6 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 monthly average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| Flow, total | total | report only (Mgal/mo) | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 201 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 201 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ .25 lb/d | all year | 201 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ .38 lb/d | all year | 201 |
| pH | minimum | ≥ 6.5 SU | all year | 201 |
| pH | maximum | ≤ 8.5 SU | all year | 201 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 201 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 201 |
| Solids, total suspended | maximum monthly average | ≤ .25 lb/d | all year | 201 |
| Solids, total suspended | maximum weekly average | ≤ .38 lb/d | all year | 201 |
| Flow, in conduit or thru treatment plant | monthly average | report only (gal/d) | all year | 201 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (gal/d) | all year | 201 |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year | 201 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 201 |
| E. coli | daily maximum | report only (MPN/100mL) | all year | 201 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 301 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 301 |
| Nitrogen, total [as N] | monthly load | report only (lb/mo) | all year | 301 |
| Nitrogen, total [as N] | annual maximum | report only (lb/yr) | all year | 301 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 301 |
| Nitrogen, organic total [as N] | daily maximum | report only (mg/L) | all year | 301 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 301 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 301 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 301 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 301 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 301 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 301 |
| Phosphorus, total [as P] | monthly load | report only (lb/mo) | all year | 301 |
| Phosphorus, total [as P] | annual maximum | report only (lb/yr) | all year | 301 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 301 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 301 |
| Flow, total | total | report only (Mgal/mo) | all year | 301 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 401 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 401 |
| Nitrogen, total [as N] | monthly load | report only (lb/mo) | all year | 401 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | 401 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 401 |
| Nitrogen, organic total [as N] | daily maximum | report only (mg/L) | all year | 401 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 401 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 401 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 401 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 401 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 401 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 401 |
| Phosphorus, total [as P] | monthly load | report only (lb/mo) | all year | 401 |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | 401 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 401 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 401 |
| Flow, total | monthly total | report only (Mgal/mo) | all year | 401 |
Cited limits by parameter: Maryland's rules and the federal ones.
Same industry: the 18 Water Supply permits in Maryland.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MD0061841 · MCP: https://passage-data.com/mcp