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Sewage treatment plant, Secretary, Maryland. NPDES permit MD0055352, in force until Sep 30, 2028. Last 12 months: over a limit once (last June 2026), 24 required values missing, 3 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| June 2026 | Coliform, fecal general, monthly median | 25.6 MPN/100mL | ≤ 14 MPN/100mL | 83% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year |
| Oxygen, dissolved [DO] | minimum 7-day average | ≥ 6 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Apr, May |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Apr, May |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 70 lb/d | Apr, May |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 70 lb/d | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 105 lb/d | Apr, May |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 105 lb/d | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | maximum monthly average | ≤ 90 mg/L | Apr, May |
| Solids, total suspended | maximum monthly average | ≤ 90 mg/L | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Solids, total suspended | maximum monthly average | ≤ 211 lb/d | Apr, May |
| Solids, total suspended | maximum monthly average | ≤ 211 lb/d | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Apr, May |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Apr, May |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | all year |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | Apr, May |
| Nitrogen, organic total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrogen, organic total [as N] | monthly average | report only (lb/d) | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | May–Oct |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.2 mg/L | May–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Apr, May |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 22 lb/d | May–Oct |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Apr, May |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Apr, May |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | Apr, May |
| Nitrite + Nitrate total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Phosphate, total [as PO4] | annual total | report only (lb/yr) | all year |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Apr, May |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Apr, May |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| 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 | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | maximum | ≤ .1 mg/L | all year |
| Phosphorous, in total orthophosphate | monthly average | report only (mg/L) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Phosphorous, in total orthophosphate | monthly average | report only (mg/L) | Apr, May |
| Phosphorous, in total orthophosphate | monthly average | report only (lb/d) | Jan, Feb, Mar, Jun, Jul, Aug, Sep, Oct, Nov, Dec |
| Phosphorous, in total orthophosphate | monthly average | report only (lb/d) | Apr, May |
| Coliform, fecal general | monthly median | ≤ 14 MPN/100mL | all year |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year |
| Flow, total | monthly total | report only (Mgal/mo) | all year |
| Flow, total | annual total | report only (Mgal/yr) | all year |
Cited limits by parameter: Maryland's rules and the federal ones.
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