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Scott County Public Service Authority

Sewage treatment plant, Duffield, Virginia. NPDES permit VA0029564, in force until Oct 31, 2028. Last 12 months: over a limit 2 times (last March 2026), 2 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (19 values), form S1 twice a year, form S2 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 1 of 16 reports late

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

Period endingParameterReportedLimitOver by
January 2026Chlorine, total residual, weekly average1≤ .019 mg/L5163%
March 2026Chlorine, total residual, weekly average.25≤ .019 mg/L1216%

Limits in force (23)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily minimum≥ 6.2 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≤ 36 kg/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 54 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 45 kg/dall year
Solids, total suspendedweekly average≤ 68 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 5.2 mg/LJun–Nov
Nitrogen, ammonia total [as N]weekly average≤ 7.7 mg/LJun–Nov
Flow, in conduit or thru treatment plantmonthly average≤ .4 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≤ .016 mg/Lall year
Chlorine, total residualweekly average≤ .019 mg/Lall year
Chlorine, total residualinstantaneous minimum≥ .6 mg/Lall 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.

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/VA0029564 · MCP: https://passage-data.com/mcp