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Sewage treatment plant, major discharger, Leonardtown, Maryland. NPDES permit MD0024767, in force until Feb 28, 2030. Last 12 months: over a limit 5 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], maximum monthly average | 4.2 mg/L | ≤ 4 mg/L | 5% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 24.99 lb/d | ≤ 23 lb/d | 9% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 4.35 mg/L | ≤ 4 mg/L | 9% |
| March 2026 | BOD, 5-day, percent removal, maximum monthly average | 98.57 % | ≤ 85 % | 90% |
| March 2026 | Solids, suspended percent removal, maximum monthly average | 97.69 % | ≤ 85 % | 85% |
| 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 | ≤ 15 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 23 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 85 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 130 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 | ≤ 170 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 255 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 62129 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] | cumulative total | ≤ 8284 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | Dec | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 4 mg/L | May–Oct | 001 |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | May–Oct | 001 |
| Nitrogen, total [as N] | EPA's "SEAN MAX" | ≤ 690 lb/mo | May–Oct | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .8 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.1 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 4 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 11.6 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 4.5 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 12 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 23 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 66 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 | ≤ 621 lb/yr | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | Dec | 001 |
| Phosphorus, total [as P] | monthly total | ≤ 52 lb/mo | May–Oct | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .3 mg/L | May–Oct | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Phosphorus, total [as P] | EPA's "SEAS TDT" | report only (lb/yr) | May–Oct | 001 |
| 2,3,7,8-Tetrachlorodibenzo-p-dioxin | monthly average | ≤ .0000016 ug/L | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[b]fluoranthene | monthly average | ≤ .57 ug/L | all year | 001 |
| Benzo[k]fluoranthene | monthly average | ≤ .57 ug/L | all year | 001 |
| Benzo[a]pyrene | monthly average | ≤ .57 ug/L | all year | 001 |
| Chrysene | monthly average | ≤ .57 ug/L | all year | 001 |
| Indeno[1,2,3-cd]pyrene | monthly average | ≤ .57 ug/L | all year | 001 |
| Benzo[a]anthracene | monthly average | ≤ .57 ug/L | all year | 001 |
| Dibenz[a,h]anthracene | monthly average | ≤ .57 ug/L | all year | 001 |
| Benzidine | monthly average | ≤ .34 ug/L | all year | 001 |
| 4,4'-DDT | monthly average | ≤ .0009 ug/L | all year | 001 |
| Chlordane [tech mix. and metabolites] | monthly average | ≤ .0043 ug/L | all year | 001 |
| Toxaphene | monthly average | ≤ .002 ug/L | all year | 001 |
| Heptachlor | monthly average | ≤ .00018 ug/L | all year | 001 |
| Heptachlor epoxide | monthly average | ≤ .0009 ug/L | all year | 001 |
| Hexachlorobenzene | monthly average | ≤ .0092 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 | daily maximum | < .011 mg/L | all year | 001 |
| Coliform, fecal general | monthly median | ≤ 14 MPN/100mL | all year | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (pg/L) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | cumulative total | report only (g/yr) | Mar, Jun, Sep, Dec | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly total | report only (g/qtr) | Mar, Jun, Sep, Dec | 001 |
| BOD, 5-day, percent removal | maximum monthly average | ≤ 85 % | all year | 001 |
| Solids, suspended percent removal | maximum monthly average | ≤ 85 % | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | total | report only (Mgal/mo) | 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 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly total | report only (lb/yr) | all year | TRAD |
| Solids, total suspended | monthly total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | monthly total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | monthly total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | monthly total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | monthly total | report only (lb/yr) | all year | TRAD |
| Flow | year-to-date total | report only (Mgal/yr) | all year | TRAD |
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/MD0024767 · MCP: https://passage-data.com/mcp