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Upper Occoquan Service Authority

Sewage treatment plant, major discharger, Centreville, Virginia. NPDES permit VA0024988, in force until Sep 30, 2028. 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 (21 values), form A1 yearly, form S1 twice a year
Renewal application due
Apr 3, 2028 · 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 15 reports late

Limits in force (25)

ParameterStatisticLimitMonths
Turbiditymonthly average≤ .5 NTUall year
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/Lall year
Oxygen demand, chem. [low level] [COD]monthly average≤ 10 mg/Lall year
Oxygen demand, chem. [low level] [COD]weekly average≤ 25 mg/Lall year
Oxygen demand, chem. [low level] [COD]monthly average≤ 2000 kg/dall year
Oxygen demand, chem. [low level] [COD]weekly average≤ 5100 kg/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 1 mg/Lall year
Solids, total suspendedweekly average≤ 2.5 mg/Lall year
Solids, total suspendedmonthly average≤ 200 kg/dall year
Solids, total suspendedweekly average≤ 510 kg/dall year
Nitrogen, Kjeldahl, total [as N]monthly average≤ 1 mg/Lall year
Nitrogen, Kjeldahl, total [as N]weekly average≤ 2.5 mg/Lall year
Phosphorus, total [as P]monthly average≤ .1 mg/Lall year
Phosphorus, total [as P]weekly average≤ .25 mg/Lall year
Surfactants [MBAS]monthly average≤ .1 mg/Lall year
Surfactants [MBAS]weekly average≤ .25 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ 54 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all year
Chlorine, total residualmonthly average≤ .008 mg/Lall year
Chlorine, total residualweekly average≤ .01 mg/Lall year
E. colimonthly geometric mean≤ 2 #/100mLall year
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaweekly averagereport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Pimphales promelasweekly averagereport only (tox chronic)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/VA0024988 · MCP: https://passage-data.com/mcp