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Sewage treatment plant, Hampstead, Maryland. NPDES permit MD0022446, in force until Aug 31, 2030. Last 12 months: over a limit 11 times (last February 2026), 3 required values missing, 4 of 56 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Nitrogen, ammonia total [as N], maximum monthly average | 4.3 mg/L | ≤ 1.6 mg/L | 169% |
| December 2025 | Nitrogen, ammonia total [as N], maximum monthly average | 8.2 lb/d | ≤ 8 lb/d | 3% |
| December 2025 | Nitrogen, ammonia total [as N], maximum daily average | 7.5 mg/L | < 3.4 mg/L | 121% |
| January 2026 | Nitrogen, ammonia total [as N], daily maximum | 30.8 lb/d | ≤ 17 lb/d | 81% |
| January 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 17.9 lb/d | ≤ 8 lb/d | 124% |
| January 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 8.1 mg/L | ≤ 1.6 mg/L | 406% |
| January 2026 | Nitrogen, ammonia total [as N], maximum daily average | 13.1 mg/L | < 3.4 mg/L | 285% |
| February 2026 | Nitrogen, ammonia total [as N], daily maximum | 49.4 lb/d | ≤ 17 lb/d | 191% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 18.2 lb/d | ≤ 8 lb/d | 128% |
| February 2026 | Nitrogen, ammonia total [as N], maximum monthly average | 7.8 mg/L | ≤ 1.6 mg/L | 388% |
| February 2026 | Nitrogen, ammonia total [as N], maximum daily average | 20.3 mg/L | < 3.4 mg/L | 497% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | maximum | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 20 mg/L | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 30 mg/L | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 100 lb/d | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 150 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 150 lb/d | May–Sep | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 225 lb/d | Jan, Feb, Mar, Apr, 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 | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | maximum monthly average | ≤ 150 lb/d | all year | 001 |
| Solids, total suspended | annual maximum | report only (lb/yr) | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 225 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | annual maximum | report only (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, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .5 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ .6 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 1.9 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 2.5 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.5 lb/d | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3 lb/d | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 9.5 lb/d | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | maximum daily average | ≤ 12.5 lb/d | Jan, Feb, Mar, Apr, Oct, 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 | ≤ .3 mg/L | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ .45 mg/L | all year | 001 |
| Phosphorus, total [as P] | annual maximum | report only (lb/yr) | all year | 001 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1.5 lb/d | all year | 001 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 2.3 lb/d | 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 |
| Cyanide, free [as free] | minimum | report only (ug/L) | all year | 001 |
| Sulfate, dissolved [as SO4] | minimum | report only (ug/L) | all year | 001 |
| Aluminum, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Acrylonitrile | minimum | report only (ug/L) | all year | 001 |
| Benzo[b]fluoranthene | minimum | report only (ug/L) | all year | 001 |
| Benzo[k]fluoranthene | minimum | report only (ug/L) | all year | 001 |
| Chrysene | minimum | report only (ug/L) | all year | 001 |
| Indeno[1,2,3-cd]pyrene | minimum | report only (ug/L) | all year | 001 |
| N-Nitrosodi-N-propylamine | minimum | report only (ug/L) | all year | 001 |
| N-Nitrosodimethylamine [NDMA] | minimum | report only (ug/L) | all year | 001 |
| Benzo[a]anthracene | minimum | report only (ug/L) | all year | 001 |
| 3,3'-Dichlorobenzidine | minimum | report only (ug/L) | all year | 001 |
| Benzidine | minimum | report only (ug/L) | all year | 001 |
| 4,4'-DDT | minimum | report only (ug/L) | all year | 001 |
| 4,4'-DDD | minimum | report only (ug/L) | all year | 001 |
| 4,4'-DDE | minimum | report only (ug/L) | all year | 001 |
| Aldrin | minimum | report only (ug/L) | all year | 001 |
| Chlordane [tech mix. and metabolites] | minimum | report only (ug/L) | all year | 001 |
| Dieldrin | minimum | report only (ug/L) | all year | 001 |
| Toxaphene | minimum | report only (ug/L) | all year | 001 |
| Heptachlor | minimum | report only (ug/L) | all year | 001 |
| Heptachlor epoxide | minimum | report only (ug/L) | all year | 001 |
| Polychlorinated biphenyls [PCBs] | minimum | report only (ug/L) | all year | 001 |
| Hexachlorobenzene | minimum | report only (ug/L) | all year | 001 |
| Temperature, length of excursion | value | ≤ 1 d | all year | 001 |
| Temperature, length of excursion | value | report only (hr) | all year | 001 |
| Temperature, length of excursion | value | ≤ 1 d | all year | 001 |
| Flow, in conduit or thru treatment plant | maximum | ≤ .55 MGD | all year | 001 |
| E. coli | maximum | ≤ 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 | annual total | report only (Mgal/yr) | all year | 001 |
| Flow, total | annual total | report only (Mgal/yr) | all year | 001 |
| Chloride, dissolved [as Cl] | minimum | report only (ug/L) | all year | 001 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 20 mg/L | May–Sep | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 30 mg/L | May–Sep | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 150 lb/mo | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 100 lb/d | May–Sep | 002 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 150 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 225 lb/mo | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 150 lb/d | May–Sep | 002 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 225 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 002 |
| pH | minimum | report only (SU) | all year | 002 |
| pH | maximum | report only (SU) | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 150 lb/d | all year | 002 |
| Solids, total suspended | maximum weekly average | ≤ 225 lb/d | all year | 002 |
| Solids, total suspended | annual maximum | report only (lb/yr) | all year | 002 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 002 |
| Nitrogen, total [as N] | annual maximum | report only (lb/yr) | all year | 002 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | average value | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily average | report only (lb/d) | all year | 002 |
| Nitrogen, ammonia total [as N] | average value | report only (lb/d) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | maximum monthly average | ≤ .3 mg/L | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | maximum weekly average | ≤ .45 mg/L | all year | 002 |
| Phosphorus, total [as P] | maximum monthly average | ≤ 1.5 lb/d | all year | 002 |
| Phosphorus, total [as P] | annual maximum | report only (lb/yr) | all year | 002 |
| Phosphorus, total [as P] | maximum weekly average | ≤ 2.3 lb/d | all year | 002 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 002 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 002 |
| Flow, in conduit or thru treatment plant | annual maximum | ≤ .6 MGD | all year | 002 |
| E. coli | maximum | report only (MPN/100mL) | all year | 002 |
| BOD, 5-day, percent removal | monthly average | report only (%) | all year | 002 |
| Solids, suspended percent removal | monthly average | report only (%) | all year | 002 |
| Flow, total | monthly total | report only (MGD) | all year | 002 |
| Oxygen, dissolved [DO] | minimum | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | weekly maximum | report only (mg/L) | all year | 101 |
| BOD, 5-day, 20 deg. C | monthly average | report only (lb/d) | all year | 101 |
| BOD, 5-day, 20 deg. C | weekly maximum | report only (lb/d) | all year | 101 |
| pH | minimum | report only (SU) | all year | 101 |
| pH | maximum | report only (SU) | all year | 101 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 101 |
| Solids, total suspended | weekly maximum | report only (mg/L) | all year | 101 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 101 |
| Solids, total suspended | weekly maximum | report only (lb/d) | all year | 101 |
| Solids, total suspended | annual maximum | ≤ 82000 lb/yr | all year | 101 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 101 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 101 |
| Nitrogen, total [as N] | annual maximum | ≤ 10964 lb/yr | all year | 101 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 101 |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | all year | 101 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (lb/d) | all year | 101 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year | 101 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 101 |
| Phosphorus, total [as P] | weekly maximum | report only (mg/L) | all year | 101 |
| Phosphorus, total [as P] | monthly average | report only (lb/d) | all year | 101 |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year | 101 |
| Phosphorus, total [as P] | annual average | ≤ 822 lb/yr | all year | 101 |
| Phosphorus, total [as P] | weekly maximum | report only (lb/d) | all year | 101 |
| Phosphate, ortho [as P] | 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 |
| E. coli | maximum | report only (MPN/100mL) | all year | 101 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 102 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 102 |
| 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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