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Sewage treatment plant, Delmar, Maryland. NPDES permit MD0020532, in force until Jul 31, 2031. Last 12 months: over a limit 6 times (last March 2026), 1 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 18.8 mg/L | ≤ 3 mg/L | 527% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 89.9 lb/d | ≤ 21.3 lb/d | 322% |
| February 2026 | Nitrogen, ammonia total [as N], maximum daily average | 118.4 lb/d | ≤ 88.7 lb/d | 33% |
| February 2026 | Nitrogen, ammonia total [as N], maximum daily average | 25.3 mg/L | ≤ 12.5 mg/L | 102% |
| March 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 3.9 mg/L | ≤ 3 mg/L | 30% |
| March 2026 | Nitrogen, ammonia total [as N], maximum daily average | 15.7 mg/L | ≤ 12.5 mg/L | 26% |
| 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 | ≤ 20 mg/L | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 30 mg/L | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 140 lb/d | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 210 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 210 lb/d | Apr–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 320 lb/d | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 8.5 SU | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 21 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 31 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 148 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 222 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 54000 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | value | report only (%) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 10355 lb/yr | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | total | report only (lb/yr) | all year | 001 |
| Nitrogen, total [as N] | 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 | ≤ 1.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 10.5 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 12.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 74.5 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 88.7 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 10.6 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 21.3 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .38 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ .58 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 2.7 lb/d | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 777 lb/yr | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 4.1 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 001 |
| Phosphorus, total [as P] | total | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | total | report only (lb/yr) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[k]fluoranthene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzo[a]pyrene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Indeno[1,2,3-cd]pyrene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dibenz[a,h]anthracene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzidine | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 4,4'-DDT | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Aldrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dieldrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Endosulfan, total | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Endrin | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Toxaphene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Heptachlor | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Heptachlor epoxide | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Hexachlorobenzene | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 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 | ≤ .1 mg/L | all year | 001 |
| Chlordane | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 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 | monthly total | report only (Mgal/mo) | all year | 001 |
| Flow, total | total | report only (Mgal/yr) | all year | 001 |
| Flow, total | 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 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 101 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 101 |
| Solids, total suspended | cumulative total | report only (lb/yr) | all year | TRAD |
| Solids, total suspended | cumulative total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | TRAD |
| Nitrogen, total [as N] | cumulative total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | TRAD |
| Phosphorus, total [as P] | cumulative total | report only (lb/yr) | all year | TRAD |
| Flow | year-to-date total | report only (Mgal/yr) | all year | TRAD |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average | 1.5 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 1.55 mg/L (6 values) | 1.03× |
| Nitrogen, ammonia total [as N], maximum monthly average | 7.1 lb/d (May–Oct) | tighter | 0.3 lb/d (6 values) | 0.0423× |
| Nitrogen, ammonia total [as N], maximum monthly average | 1 mg/L (May–Oct) | tighter | 0.1 mg/L (6 values) | 0.1× |
| Nitrogen, ammonia total [as N], maximum monthly average | 11 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 7.2 lb/d (6 values) | 0.655× |
| Nitrogen, ammonia total [as N], maximum daily average | 49.7 lb/d (May–Oct) | tighter | 0.85 lb/d (6 values) | 0.0171× |
| Nitrogen, ammonia total [as N], maximum daily average | 7 mg/L (May–Oct) | tighter | 0.15 mg/L (6 values) | 0.0214× |
| Nitrogen, ammonia total [as N], maximum daily average | 8 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 4.05 mg/L (6 values) | 0.506× |
| Nitrogen, ammonia total [as N], maximum daily average | 57 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 20 lb/d (6 values) | 0.351× |
Cited limits by parameter: Maryland's rules and the federal ones.
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