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Sewage treatment plant, major discharger, Salisbury, Maryland. NPDES permit MD0021571, in force until May 31, 2028. Last 12 months: over a limit 3 times (last April 2026), 21 required values missing, 3 of 85 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | Toxicity, Chronic, maximum | 4.8 tox acute | ≤ 2.84 tox acute | 69% |
| March 2026 | Toxicity, Chronic, maximum | 4.8 tox acute | ≤ 2.84 tox acute | 69% |
| April 2026 | Enterococci, maximum monthly geometric mean | 37 MPN/100mL | ≤ 35 MPN/100mL | 6% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | ≥ 6 mg/L | Feb–May | 001 |
| Oxygen, dissolved [DO] | minimum weekly average | report only (mg/L) | Jan, Jun, Jul, Aug, Sep, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 28.8 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum daily average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 43.2 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 2100 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 2041 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 3200 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 3062 lb/d | May–Oct | 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 | ≤ 2100 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 3200 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 776618 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 6.6 mg/L | May–Oct | 001 |
| Nitrogen, total [as N] | maximum monthly average | report only (mg/L) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 467 lb/d | May–Oct | 001 |
| Nitrogen, total [as N] | maximum monthly average | report only (lb/d) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, total [as N] | cumulative total | ≤ 103549 lb/yr | all year | 001 |
| Nitrogen, total [as N] | annual total | report only (lb/yr) | Dec | 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 | ≤ 4.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 12 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 319 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 850 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] | maximum monthly average | ≤ 1.6 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 110 lb/d | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 7766 lb/yr | all year | 001 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | Dec | 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 |
| Silver total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Silver total recoverable | daily average | ≤ 7.8 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ 7.1 ug/L | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ 7.5 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ 6.9 ug/L | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ 7.3 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ 6.8 ug/L | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ 6.9 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ 6.5 ug/L | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ .33 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ .3 lb/d | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ .38 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ .35 lb/d | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ .41 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ .39 lb/d | May–Oct | 001 |
| Silver total recoverable | daily average | ≤ .49 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Silver total recoverable | daily average | ≤ .46 lb/d | May–Oct | 001 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Copper, total recoverable | monthly average | ≤ 17.4 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ 16.6 ug/L | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ 16.7 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ 15.6 ug/L | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ 16.3 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ 15 ug/L | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ 14.8 ug/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ 13.8 ug/L | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ .73 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ .69 lb/d | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ .84 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ .78 lb/d | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ .92 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ .85 lb/d | May–Oct | 001 |
| Copper, total recoverable | monthly average | ≤ 1.05 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Copper, total recoverable | monthly average | ≤ .98 lb/d | May–Oct | 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[k]fluoranthene | 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 |
| 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 |
| Heptachlor epoxide | 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 |
| Enterococci | maximum monthly geometric mean | ≤ 35 MPN/100mL | all year | 001 |
| BOD, 5-day, percent removal | minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | minimum | ≥ 85 % | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | Dec | 001 |
| Flow, total | monthly 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 |
| Toxicity, Acute | maximum | ≤ 1 tox chronic | all year | 001 |
| Toxicity, Chronic | maximum | ≤ 2.84 tox acute | 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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