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Noncommercial Research Organizations, Beltsville, Maryland. NPDES permit MD0020851 expired Oct 31, 2023; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 2 required values missing, 4 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Copper, total recoverable, maximum monthly average | 58.95 ug/L | ≤ 19 ug/L | 210% |
| December 2025 | Phosphorus, total [as P], annual average | .49 mg/L | < .3 mg/L | 63% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | all year |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 20 mg/L | Apr–Oct |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 30 mg/L | Apr–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 33 lb/d | Apr–Oct |
| BOD, 5-day, 20 deg. C | maximum monthly average | ≤ 50 lb/d | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 50 lb/d | Apr–Oct |
| BOD, 5-day, 20 deg. C | maximum weekly average | ≤ 75 lb/d | Jan, Feb, Mar, Nov, Dec |
| BOD, 5-day, 20 deg. C | cumulative total | ≤ 14705 lb/yr | all year |
| BOD, 5-day, 20 deg. C | monthly total | report only (lb/mo) | all year |
| pH | minimum | ≥ 6.5 SU | all year |
| pH | maximum | ≤ 8.5 SU | all year |
| Solids, total suspended | maximum monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Solids, total suspended | maximum monthly average | ≤ 20 mg/L | Apr–Sep |
| Solids, total suspended | maximum weekly average | ≤ 45 mg/L | Jan, Feb, Mar, Oct, Nov, Dec |
| Solids, total suspended | maximum weekly average | ≤ 30 mg/L | Apr–Sep |
| Solids, total suspended | maximum monthly average | ≤ 50 lb/d | Jan, Feb, Mar, Oct, Nov, Dec |
| Solids, total suspended | maximum monthly average | ≤ 33 lb/d | Apr–Sep |
| Solids, total suspended | maximum weekly average | ≤ 75 lb/d | Jan, Feb, Mar, Oct, Nov, Dec |
| Solids, total suspended | EPA's "SEAS TDT" | ≤ 7120 lb/yr | Apr–Oct |
| Solids, total suspended | maximum weekly average | ≤ 50 lb/d | Apr–Sep |
| Solids, total suspended | cumulative total | ≤ 14680 lb/yr | all year |
| Solids, total suspended | monthly total | report only (lb/mo) | all year |
| Nitrogen, total [as N] | maximum monthly average | ≤ 6.7 lb/d | all year |
| Nitrogen, total [as N] | monthly total | report only (lb/mo) | all year |
| Nitrogen, total [as N] | cumulative total | ≤ 2437 lb/yr | all year |
| Nitrogen, total [as N] | annual average | < 4 mg/L | Dec |
| Nitrogen, organic total [as N] | monthly average | report only (mg/L) | all year |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 3.6 mg/L | Apr–Oct |
| Nitrogen, ammonia total [as N] | monthly average | report only (lb/d) | Jan, Feb, Mar, Nov, Dec |
| Nitrogen, ammonia total [as N] | maximum monthly average | ≤ 6 lb/d | Apr–Oct |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | all year |
| Phosphorus, total [as P] | annual average | < .3 mg/L | Dec |
| Phosphorus, total [as P] | maximum monthly average | ≤ .5 lb/d | all year |
| Phosphorus, total [as P] | monthly total | report only (lb/mo) | all year |
| Phosphorus, total [as P] | cumulative total | ≤ 183 lb/yr | all year |
| Cyanide, total [as CN] | monthly average | report only (ug/L) | all year |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year |
| Arsenic, total [as As] | monthly average | report only (ug/L) | all year |
| Cadmium, total [as Cd] | monthly average | report only (ug/L) | all year |
| Lead, total [as Pb] | monthly average | report only (ug/L) | all year |
| Nickel, total [as Ni] | monthly average | report only (ug/L) | all year |
| Silver, total [as Ag] | monthly average | report only (ug/L) | all year |
| Zinc, total [as Zn] | monthly average | report only (ug/L) | all year |
| Copper, total recoverable | maximum monthly average | ≤ 19 ug/L | all year |
| Copper, total recoverable | maximum monthly average | ≤ .03 lb/d | all year |
| Phosphate, ortho [as P] | monthly average | report only (mg/L) | all year |
| Heptachlor epoxide | monthly average | report only (ug/L) | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Chlorine, total residual | maximum | < .1 mg/L | all year |
| E. coli | maximum monthly geometric mean | ≤ 126 MPN/100mL | all year |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year |
| Organics, total toxic [TTO] | monthly average | report only (mg/L) | all year |
| Polychlorinated biphenyls [PCB] pg/L | cumulative total | report only (g/yr) | Mar, Jun, Sep, Dec |
| Polychlorinated biphenyls [PCB] pg/L | quarterly average | report only (pg/L) | Mar, Jun, Sep, Dec |
| Polychlorinated biphenyls [PCB] pg/L | quarterly total | report only (g/qtr) | Mar, Jun, Sep, Dec |
| Flow, total | monthly total | report only (Mgal/mo) | all year |
Cited limits by parameter: Maryland's rules and the federal ones.
Same industry: the 9 Engineering, Accounting, Research and Management Services permits in Maryland.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/MD0020851 · MCP: https://passage-data.com/mcp