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Gretna Town

Sewage treatment plant, Gretna, Virginia. NPDES permit VA0063843, in force until Aug 31, 2029. Last 12 months: over a limit 12 times (last April 2026), 1 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (21 values), form S1 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 2 of 13 reports late

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

Period endingParameterReportedLimitOver by
November 2025Nitrogen, ammonia total [as N], monthly average10.3≤ 7 mg/L47%
November 2025Nitrogen, ammonia total [as N], maximum weekly average18.3≤ 10.2 mg/L79%
December 2025Nitrogen, ammonia total [as N], monthly average10.6≤ 7 mg/L51%
December 2025Nitrogen, ammonia total [as N], maximum weekly average18.9≤ 10.2 mg/L85%
January 2026Nitrogen, ammonia total [as N], monthly average17.4≤ 7 mg/L149%
January 2026Nitrogen, ammonia total [as N], maximum weekly average24.4≤ 10.2 mg/L139%
February 2026Nitrogen, ammonia total [as N], monthly average14≤ 7 mg/L100%
February 2026Nitrogen, ammonia total [as N], maximum weekly average25.9≤ 10.2 mg/L154%
March 2026Nitrogen, ammonia total [as N], monthly average11.2≤ 7 mg/L60%
March 2026Nitrogen, ammonia total [as N], maximum weekly average13≤ 10.2 mg/L27%
April 2026Nitrogen, ammonia total [as N], monthly average15.7≤ 7 mg/L124%
April 2026Nitrogen, ammonia total [as N], maximum weekly average21.7≤ 10.2 mg/L113%

Limits in force (27)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily 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≤ 26.1 kg/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 39.2 kg/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (kg/d)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 26.1 kg/dall year
Solids, total suspendedmaximum weekly average≤ 39.2 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (kg/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 7 mg/Lall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 10.2 mg/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ .23 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD) (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ 26.5 ug/Lall year
Chlorine, total residualmaximum weekly average≤ 30 ug/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/VA0063843 · MCP: https://passage-data.com/mcp