Passage Data · Check a report · Use it from your AI
Sewage treatment plant, major discharger, Westminster, Maryland. NPDES permit MD0021831, in force until Jul 31, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Conductivity | monthly average | report only (dS/m) | all year | 001 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 1300 lb/d | all year | 001 |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 1900 lb/d | all year | 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 | ≤ 1300 lb/d | all year | 001 |
| Solids, total suspended | maximum weekly average | ≤ 1900 lb/d | all year | 001 |
| Solids, total suspended | cumulative total | ≤ 456834 lb/yr | all year | 001 |
| Solids, total suspended | monthly total | report only (lb/mo) | all year | 001 |
| Solids, total suspended | annual total | report only (lb/yr) | Dec | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year | 001 |
| Nitrogen, total [as N] | cumulative total | ≤ 60911 lb/yr | 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] | annual total | report only (lb/yr) | Dec | 001 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 2.7 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 5.5 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 113 lb/d | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 229 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] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | cumulative total | ≤ 4568 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 |
| Phosphorus, total [as P] | annual total | report only (lb/yr) | Dec | 001 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Selenium, total recoverable | value | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Cadmium, total recoverable | value | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Lead, total recoverable | value | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year | 001 |
| Acrolein | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzo[b]fluoranthene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzo[k]fluoranthene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzo[a]pyrene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Chrysene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 1,2-Diphenylhydrazine | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| .beta.-Endosulfan | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| .alpha.-Endosulfan | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Indeno[1,2,3-cd]pyrene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| N-Nitrosodi-N-propylamine | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| N-Nitrosodimethylamine [NDMA] | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzo[a]anthracene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dibenz[a,h]anthracene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 3,3'-Dichlorobenzidine | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 4,6-Dinitro-o-cresol | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Pentachlorophenol | value | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Pentachlorophenol | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzidine | value | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Benzidine | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 4,4'-DDT | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 4,4'-DDD | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| 4,4'-DDE | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Aldrin | value | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Aldrin | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| .alpha.-BHC | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| .beta.-BHC | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Chlordane [tech mix. and metabolites] | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Dieldrin | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Endrin | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Toxaphene | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Heptachlor | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Heptachlor epoxide | monthly average | report only (ug/L) | Mar, Jun, Sep, Dec | 001 |
| Hexachlorobenzene | monthly 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 | instantaneous maximum | ≤ .012 mg/L | all year | 001 |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year | 001 |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | 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 | 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 |
| 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 | 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 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Nitrogen, ammonia total [as N], maximum monthly average | 1.4 mg/L (May–Oct) | tighter | 0.18 mg/L (5 values) | 0.129× |
| Nitrogen, ammonia total [as N], maximum monthly average | 58 lb/d (May–Oct) | tighter | 5.12 lb/d (5 values) | 0.0883× |
| Nitrogen, ammonia total [as N], maximum monthly average | 2 mg/L (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 0.3 mg/L (6 values) | 0.15× |
| Nitrogen, ammonia total [as N], maximum monthly average | 83 lb/d (Jan, Feb, Mar, Apr, Nov, Dec) | tighter | 9.53 lb/d (6 values) | 0.115× |
Cited limits by parameter: Maryland's rules and the federal ones.
· Save this facility as a site · Superfund sites nearby · Your permits on one board
On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MD0021831 · MCP: https://passage-data.com/mcp