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Sewage treatment plant, major discharger, Perryville, Maryland. NPDES permit MD0020613, in force until Aug 31, 2031. Last 12 months: over a limit 6 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Nitrogen, ammonia total [as N], maximum monthly average | 5.18 mg/L | ≤ 2.5 mg/L | 107% |
| November 2025 | Nitrogen, ammonia total [as N], maximum daily average | 14.3 mg/L | ≤ 5 mg/L | 186% |
| November 2025 | Nitrogen, ammonia total [as N], maximum daily average | 75 lb/d | ≤ 69 lb/d | 9% |
| December 2025 | E. coli, maximum monthly geometric mean | 200 MPN/100mL | ≤ 126 MPN/100mL | 59% |
| September 2026 | Aluminum, total recoverable, maximum | 1790 ug/L | ≤ 670 ug/L | 167% |
| September 2026 | Nitrogen, total [as N], annual maximum | 5982 lb/yr | ≤ 1508 lb/yr | 297% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 410 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 620 lb/d | 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 410 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 620 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 150755 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 1508 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 | ≤ 1.6 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 3.1 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 22 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 34 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 43 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 69 lb/d | Jan, Feb, Mar, Apr, 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] | cumulative total | ≤ 20088 lb/yr | all year | 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 |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Aluminum, total recoverable | maximum | ≤ 670 ug/L | all year | 001 |
| Copper, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Dioxin | monthly average | report only (ug/L) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[b]fluoranthene | monthly average | report only (ug/L) | all year | 001 |
| Benzo[a]pyrene | monthly average | report only (ug/L) | all year | 001 |
| .beta.-Endosulfan | monthly average | report only (ug/L) | all year | 001 |
| .alpha.-Endosulfan | monthly average | report only (ug/L) | all year | 001 |
| Indeno[1,2,3-cd]pyrene | monthly average | report only (ug/L) | all year | 001 |
| Benzo[a]anthracene | monthly average | report only (ug/L) | all year | 001 |
| Dibenz[a,h]anthracene | monthly average | report only (ug/L) | all year | 001 |
| Benzidine | monthly average | report only (ug/L) | all year | 001 |
| 4,4'-DDT | monthly average | report only (ug/L) | all year | 001 |
| 4,4'-DDD | monthly average | report only (ug/L) | all year | 001 |
| 4,4'-DDE | monthly average | report only (ug/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | monthly average | report only (ug/L) | all year | 001 |
| Toxaphene | monthly average | report only (ug/L) | all year | 001 |
| Heptachlor | monthly average | report only (ug/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 | ≤ .013 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average 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 |
| 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 average | report only (mg/L) | all year | 101 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average | 15 lb/d (May–Oct) | tighter | 3 lb/d (6 values) | 0.2× |
| Nitrogen, ammonia total [as N], maximum monthly average | 1.1 mg/L (May–Oct) | tighter | 0.455 mg/L (6 values) | 0.414× |
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/MD0020613 · MCP: https://passage-data.com/mcp