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Loudoun County Sanitation Authority

Sewage treatment plant, Waterford, Virginia. NPDES permit VA0060500, in force until Feb 28, 2031. Last 12 months: no values over a limit, 6 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (17 values), form A1 yearly, form Q1 quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (23)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6.8 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 24 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 36 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5.3 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 7.9 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 6.6 kg/dall year
Solids, total suspendedweekly average≤ 9.9 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Dec
Nitrogen, ammonia total [as N]monthly average≤ 12 mg/LJun–Nov
Nitrogen, ammonia total [as N]weekly average≤ 18 mg/LJun–Nov
Flow, in conduit or thru treatment plantmonthly average≤ .058 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD) (alert, not enforceable)all year
Chlorine, total residualmonthly average≤ .017 mg/Lall year
Chlorine, total residualweekly average≤ .019 mg/Lall year
BOD, percent removal [total]monthly average minimum≥ 85 %all year
E. colimonthly average≤ 126 #/100mLall year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

New limits from Aug 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Nitrogen, ammonia total [as N], monthly average6.6 mg/L (Jun–Nov)tighter2.6 mg/L (3 values)0.394×
Nitrogen, ammonia total [as N], weekly average9.7 mg/L (Jun–Nov)tighter2.74 mg/L (3 values)0.282×

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/VA0060500 · MCP: https://passage-data.com/mcp