Passage Data · Check a report · Use it from your AI
Gypsum Products, Baltimore, Maryland. NPDES permit MD0001457, in force until May 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 002 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 45 mg/L | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 7 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 7 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 10.5 lb/d | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 10.5 lb/d | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | minimum | ≥ 6 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| pH | maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 7 lb/d | all year | 002 |
| Solids, total suspended | monthly average | ≤ 7 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 10.5 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 10.5 lb/d | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/yr) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/yr) | all year | 002 |
| Nitrogen, total [as N] | annual maximum | ≤ 933 lb/yr | all year | 002 |
| Nitrogen, total [as N] | annual maximum | ≤ 933 lb/yr | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/yr) | May–Oct | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/yr) | May–Oct | 002 |
| Nitrogen, total [as N] | EPA's "SEAS TDT" | ≤ 466 lb/yr | May–Oct | 002 |
| Nitrogen, total [as N] | EPA's "SEAS TDT" | ≤ 466 lb/yr | May–Oct | 002 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, organic total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, organic total [as N] | daily maximum | 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] | monthly average | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate 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] | 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] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/yr) | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/yr) | all year | 002 |
| Phosphorus, total [as P] | annual maximum | ≤ 155 lb/yr | all year | 002 |
| Phosphorus, total [as P] | annual maximum | ≤ 155 lb/yr | all year | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/yr) | May–Oct | 002 |
| Phosphorus, total [as P] | monthly average | report only (lb/yr) | May–Oct | 002 |
| Phosphorus, total [as P] | EPA's "SEAS TDT" | ≤ 73 lb/yr | May–Oct | 002 |
| Phosphorus, total [as P] | EPA's "SEAS TDT" | ≤ 73 lb/yr | May–Oct | 002 |
| Fecal coliform | monthly geometric mean | ≤ 14 MPN/g | all year | 002 |
| Fecal coliform | monthly geometric mean | ≤ 14 MPN/g | all year | 002 |
| Fecal coliform | monthly geometric mean | ≤ 14 MPN/g | all year | 002 |
| Fecal coliform | monthly geometric mean | ≤ 14 MPN/g | all year | 002 |
| Fecal coliform | daily maximum | report only (MPN/g) | all year | 002 |
| Fecal coliform | daily maximum | report only (MPN/g) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Chlorine, total residual | monthly average | < .1 mg/L | all year | 002 |
| Chlorine, total residual | monthly average | < .1 mg/L | all year | 002 |
| Chlorine, total residual | daily maximum | < .1 mg/L | all year | 002 |
| Chlorine, total residual | daily maximum | < .1 mg/L | all year | 002 |
| Enterococci | monthly geometric mean | ≤ 35 MPN/100mL | all year | 002 |
| Enterococci | monthly geometric mean | ≤ 35 MPN/100mL | all year | 002 |
| Enterococci | daily maximum | report only (MPN/100mL) | all year | 002 |
| Enterococci | daily maximum | report only (MPN/100mL) | all year | 002 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 003 |
| Oxygen, dissolved [DO] | instantaneous minimum | ≥ 5 mg/L | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | minimum | ≥ 6 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| pH | maximum | ≤ 9 SU | all year | 003 |
| Temp. diff. between up/down stream deg. F | daily maximum | ≤ 0 deg F | all year | 003 |
| Temp. diff. between up/down stream deg. F | daily maximum | ≤ 0 deg F | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year | 003 |
| Chlorine, total residual | monthly average | ≤ .1 mg/L | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 003 |
| Chlorine, total residual | daily maximum | ≤ .1 mg/L | all year | 003 |
Cited limits by parameter: Maryland's rules and the federal ones.
Same industry: the 3 Stone, Clay, Glass and Concrete Products permits in Maryland.
· 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/MD0001457 · MCP: https://passage-data.com/mcp