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Warrenton Town

Sewage treatment plant, major discharger, Warrenton, Virginia. NPDES permit VA0021172, in force until Aug 31, 2027. Last 12 months: over a limit 2 times (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (21 values), form A1 yearly
Renewal application due
Mar 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 0 of 13 reports late

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

Period endingParameterReportedLimitOver by
December 2025Nitrogen, Total As N, rolling average9.1≤ 4 mg/L128%
February 2026BOD, 5-day, 20 deg. C, weekly average18≤ 15 mg/L20%

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6.5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 95 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 140 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 10 mg/Lall year
Solids, total suspendedweekly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 95 kg/dall year
Solids, total suspendedweekly average≤ 140 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≤ 1.4 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ 1.7 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ 2.5 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD) (alert, not enforceable)all year
BOD, percent removal [total]monthly average minimum≥ 85 %all year
E. colimonthly average≤ 126 #/100mLall year
Nitrogen, Total As Nrolling average≤ 4 mg/LDec
Phosphorus, Total As Prolling average≤ .3 mg/LDec
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamaximumreport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Pimphales promelasmaximumreport 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/VA0021172 · MCP: https://passage-data.com/mcp