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Rectors and Visitors of George Mason University

Sewage treatment plant, Lorton, Virginia. NPDES permit VA0090221, in force until Dec 31, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (27 values), form A1 yearly
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 13 reports late

Limits in force (34)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 6 mg/Lall year
Solids, total suspendedweekly average≤ 9 mg/Lall year
Solids, total suspendedmonthly average≤ .11 kg/dall year
Solids, total suspendedweekly average≤ .17 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 2.1 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 1.5 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 2.1 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ .019 kg/dApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ .028 kg/dApr–Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ .18 mg/Lall year
Phosphorus, total [as P]weekly average≤ .27 mg/Lall year
Phosphorus, total [as P]monthly average≤ .008 lb/dall year
Phosphorus, total [as P]weekly average≤ .011 lb/dall year
Flow, in conduit or thru treatment plantmonthly average≤ .005 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD) (alert, not enforceable)all year
Chlorine, total residualmonthly average≤ .002 mg/Lall year
Chlorine, total residualweekly average≤ .0025 mg/Lall year
E. colimonthly average≤ 126 #/100mLall year
Nitrogen, Total As Nannual average≤ 12 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 8 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ .095 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ .15 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Virginia's rules and the federal ones.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/VA0090221 · MCP: https://passage-data.com/mcp