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Sewage treatment plant, Cecilton, Maryland. NPDES permit MD0020443 expired Feb 28, 2025; its limits still apply. Last 12 months: over a limit 10 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 5.21 lb/d | ≤ 2.6 lb/d | 100% |
| May 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 9.62 mg/L | ≤ 3.1 mg/L | 210% |
| June 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 11.92 mg/L | ≤ 3.1 mg/L | 285% |
| June 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 6.86 lb/d | ≤ 2.6 lb/d | 164% |
| July 2026 | BOD, 5-day, 20 deg. C, maximum weekly average | 18 mg/L | ≤ 15 mg/L | 20% |
| July 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 10.8 mg/L | ≤ 3.1 mg/L | 248% |
| July 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 5.94 lb/d | ≤ 2.6 lb/d | 128% |
| July 2026 | Nitrogen, total [as N], maximum weekly average | 23.2 mg/L | ≤ 22 mg/L | 5% |
| July 2026 | Solids, total suspended, maximum weekly average | 51 mg/L | ≤ 45 mg/L | 13% |
| August 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 3.22 mg/L | ≤ 3.1 mg/L | 4% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 6 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 10 mg/L | May–Oct |
| 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 weekly average | ≤ 15 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 monthly average | ≤ 8.3 lb/d | May–Oct |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 25 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 13 lb/d | May–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 38 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| 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 | monthly average | report only (mg/L) | all year |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year |
| Solids, total suspended | maximum monthly average | ≤ 25 lb/d | all year |
| Solids, total suspended | maximum weekly average | ≤ 38 lb/d | all year |
| Solids, total suspended | monthly total | report only (lb/mo) | all year |
| Solids, total suspended | annual maximum | report only (lb/yr) | all year |
| Nitrogen, total [as N] | maximum monthly average | ≤ 15 mg/L | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | maximum weekly average | ≤ 22 mg/L | May–Oct |
| Nitrogen, total [as N] | maximum monthly average | ≤ 12 lb/d | May–Oct |
| Nitrogen, total [as N] | annual maximum | ≤ 2466 lb/yr (alert, not enforceable) | all year |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, total [as N] | maximum weekly average | ≤ 18 lb/d | May–Oct |
| Nitrogen, total [as N] | monthly maximum | ≤ 365 lb/mo | May–Oct |
| Nitrogen, total [as N] | monthly average | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.1 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 4.2 lb/d | Jan, Feb, Mar, Apr, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.6 lb/d | May–Oct |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec |
| Phosphorus, total [as P] | maximum monthly average | ≤ 4 mg/L | May–Oct |
| Phosphorus, total [as P] | maximum weekly average | ≤ 6 mg/L | May–Oct |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec |
| Phosphorus, total [as P] | maximum monthly average | ≤ 3.4 lb/d | May–Oct |
| Phosphorus, total [as P] | annual maximum | ≤ 411 lb/yr (alert, not enforceable) | all year |
| Phosphorus, total [as P] | monthly maximum | ≤ 102 lb/mo | May–Oct |
| Phosphorus, total [as P] | maximum weekly average | ≤ 5.1 lb/d | May–Oct |
| Phosphorus, total [as P] | monthly average | report only (lb/mo) | Jan, Feb, Mar, Apr, Nov, Dec |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | 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 |
| 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/MD0020443 · MCP: https://passage-data.com/mcp