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Montgomery County Public Service Authority

Sewage treatment plant, Shawsville, Virginia. NPDES permit VA0024031, in force until Dec 31, 2028. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (22 values), form S1 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 1 of 14 reports late

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

Period endingParameterReportedLimitOver by
December 2025Oxygen, dissolved [DO], minimum.3≥ 5 mg/L94%

Limits in force (30)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 22700 g/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 34000 g/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 22700 g/dall year
Solids, total suspendedmaximum weekly average≤ 34000 g/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 13 mg/LJun–Dec
Nitrogen, ammonia total [as N]monthly average≤ 10.1 mg/LJan–May
Nitrogen, ammonia total [as N]maximum weekly average≤ 13 mg/LJun–Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 10.1 mg/LJan–May
Nitrogen, ammonia total [as N]monthly average≤ 9800 g/dJun–Dec
Nitrogen, ammonia total [as N]monthly average≤ 7600 g/dJan–May
Nitrogen, ammonia total [as N]maximum weekly average≤ 9800 g/dJun–Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 7600 g/dJan–May
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]maximum weekly average≤ 1.5 mg/Lall year
Phosphorus, total [as P]monthly average≤ 760 g/dall year
Phosphorus, total [as P]maximum weekly average≤ 1100 g/dall year
Flow, in conduit or thru treatment plantmonthly average≤ .2 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD) (alert, not enforceable)all year
BOD, percent removal [total]monthly average minimum≥ 85 %all year
E. coligeometric mean≤ 126 #/100mLall 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/VA0024031 · MCP: https://passage-data.com/mcp