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Fairfax County

Sewage treatment plant, major discharger, Lorton, Virginia. NPDES permit VA0025364, in force until May 31, 2030. Last 12 months: no values over a limit, 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form U monthly (25 values), form A1 yearly, form B yearly
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 (32)

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≤ 1522 kg/dall year
Solids, total suspendedweekly average≤ 2282 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≤ 3.1 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 254 kg/dApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 380 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≤ 45.6 kg/dall year
Phosphorus, total [as P]weekly average≤ 68.5 kg/dall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD) (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD) (alert, not enforceable)all year
E. coligeometric mean≤ 126 #/100mLall year
Nitrogen, Total As Nmonthly average≤ 3 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≤ 1286 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 2029 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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/VA0025364 · MCP: https://passage-data.com/mcp