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The Madeira School, Inc.

Sewerage Systems, Mclean, Virginia. NPDES permit VA0024121, in force until Apr 30, 2029. Last 12 months: over a limit 2 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (16 values), form A1 yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
November 2025pH, instantaneous maximum8.7≤ 8.5 SU—
July 2026Oxygen, dissolved [DO], instantaneous minimum4.7≥ 6 mg/L22%

Limits in force (17)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 23 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 2.2 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 3.4 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 23 mg/Lall year
Solids, total suspendedmonthly average≤ 2.2 kg/dall year
Solids, total suspendedweekly average≤ 3.4 kg/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 1.9 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ .0395 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all year
E. coligeometric mean≤ 126 #/100mLall 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/VA0024121 · MCP: https://passage-data.com/mcp