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Sewage treatment plant, major discharger, Annapolis, Maryland. NPDES permit MD0063207, in force until Aug 31, 2031. Last 12 months: over a limit 7 times (last July 2026), 2 of 23 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], maximum daily average | 9.1 mg/L | ≤ 7.3 mg/L | 25% |
| October 2025 | Nitrogen, total [as N], maximum daily average | 6.2 mg/L | ≤ 4.5 mg/L | 38% |
| December 2025 | Solids, total suspended, maximum weekly average | 69 mg/L | ≤ 45 mg/L | 53% |
| April 2026 | BOD, 5-day, 20 deg. C, maximum weekly average | 17 mg/L | ≤ 15 mg/L | 13% |
| April 2026 | Solids, total suspended, maximum monthly average | 33 mg/L | ≤ 30 mg/L | 10% |
| April 2026 | Solids, total suspended, maximum weekly average | 47 mg/L | ≤ 45 mg/L | 4% |
| July 2026 | E. coli, maximum monthly geometric mean | 151 MPN/100mL | ≤ 126 MPN/100mL | 20% |
| 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 | ≤ 10 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 15 mg/L | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 170 lb/d | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 500 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 250 lb/d | Apr–Oct | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 750 lb/d | Jan, Feb, Mar, 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 500 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 750 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | ≤ 182734 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 3 mg/L | Apr–Oct | 001 |
| Nitrogen, total [as N] | maximum daily average | ≤ 4.5 mg/L | Apr–Oct | 001 |
| Nitrogen, total [as N] | maximum monthly average | ≤ 50 lb/d | Apr–Oct | 001 |
| Nitrogen, total [as N] | maximum weekly average | ≤ 75 lb/d | Apr–Oct | 001 |
| Nitrogen, total [as N] | annual maximum | ≤ 24353 lb/yr | all year | 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, total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.2 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 1.9 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 7.3 mg/L | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 6.4 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 20 lb/d | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 32 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 122 lb/d | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 107 lb/d | Jan, Feb, Mar, 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] | monthly average | report only (lb/d) | all year | 001 |
| Phosphorus, total [as P] | annual maximum | ≤ 1827 lb/yr | all year | 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 |
| Carbon, dissolved organic [as C] | monthly average | report only (ug/L) | all year | 001 |
| Cyanide, free-water plus wastewaters | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Hardness, total [as CaCO3] | monthly average | report only (ug/L) | all year | 001 |
| Cadmium, total [as Cd] | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total [as Pb] | quarterly average | report only (mg/L) | Mar, Jun, Sep, Dec | 001 |
| Silver, total [as Ag] | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Aluminum, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | quarterly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Benzo[k]fluoranthene | quarterly average | report only (ug/L) | all year | 001 |
| Benzo[a]pyrene | quarterly average | report only (ug/L) | all year | 001 |
| Chrysene | quarterly average | report only (ug/L) | all year | 001 |
| Hexachlorobutadiene | quarterly average | report only (ug/L) | all year | 001 |
| Indeno[1,2,3-cd]pyrene | quarterly average | report only (ug/L) | all year | 001 |
| N-Nitrosodi-N-propylamine | quarterly average | report only (ug/L) | all year | 001 |
| N-Nitrosodimethylamine [NDMA] | quarterly average | report only (ug/L) | all year | 001 |
| Benzo[a]anthracene | quarterly average | report only (ug/L) | all year | 001 |
| Dibenz[a,h]anthracene | quarterly average | report only (ug/L) | all year | 001 |
| 2,3,7,8-TCDD TEC | quarterly average | report only (ug/L) | all year | 001 |
| Benzidine | quarterly average | report only (ug/L) | all year | 001 |
| 4,4'-DDT | quarterly average | report only (ug/L) | all year | 001 |
| 4,4'-DDD | quarterly average | report only (ug/L) | all year | 001 |
| 4,4'-DDE | quarterly average | report only (ug/L) | all year | 001 |
| Aldrin | quarterly average | report only (ug/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | quarterly average | report only (ug/L) | all year | 001 |
| Dieldrin | quarterly average | report only (ug/L) | all year | 001 |
| Toxaphene | quarterly average | report only (ug/L) | all year | 001 |
| Heptachlor | quarterly average | report only (ug/L) | all year | 001 |
| Heptachlor epoxide | quarterly 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 |
| Chlorine, total residual | maximum | < .012 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 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) | all year | 001 |
| Polychlorinated biphenyls [PCB] pg/L | quarterly total | report only (g/qtr) | Mar, Jun, Sep, Dec | 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 | 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 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| 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 average | report only (mg/L) | 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 daily average | 2.3 mg/L (Apr–Oct) | tighter | 2.75 mg/L (6 values) | 1.2× |
| Nitrogen, ammonia total [as N], maximum monthly average | 10 lb/d (Apr–Oct) | tighter | 3.95 lb/d (6 values) | 0.395× |
| Nitrogen, ammonia total [as N], maximum monthly average | 0.6 mg/L (Apr–Oct) | tighter | 0.55 mg/L (6 values) | 0.917× |
| Nitrogen, ammonia total [as N], maximum monthly average | 1 mg/L (Jan, Feb, Mar, Nov, Dec) | tighter | 0.2 mg/L (5 values) | 0.2× |
| Nitrogen, ammonia total [as N], maximum monthly average | 17 lb/d (Jan, Feb, Mar, Nov, Dec) | tighter | 1.7 lb/d (5 values) | 0.1× |
| Nitrogen, ammonia total [as N], maximum daily average | 38 lb/d (Apr–Oct) | tighter | 21.25 lb/d (6 values) | 0.559× |
| Nitrogen, ammonia total [as N], maximum daily average | 73 lb/d (Jan, Feb, Mar, Nov, Dec) | tighter | 4.4 lb/d (5 values) | 0.0603× |
| Nitrogen, ammonia total [as N], maximum daily average | 4.4 mg/L (Jan, Feb, Mar, Nov, Dec) | tighter | 0.6 mg/L (5 values) | 0.136× |
Cited limits by parameter: Maryland's rules and the federal ones.
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