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Northumberland County

Sewage treatment plant, Callao, Virginia. NPDES permit VA0091421, in force until Nov 30, 2029. Last 12 months: over a limit 10 times (last March 2026), 1 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (24 values), form A1 yearly, form S1 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 4 of 13 reports late

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

Period endingParameterReportedLimitOver by
February 2026Nitrogen, Kjeldahl, total [as N], monthly average1.7≤ .68 kg/d150%
February 2026Nitrogen, Kjeldahl, total [as N], monthly average11.4≤ 3 mg/L280%
February 2026Nitrogen, Kjeldahl, total [as N], weekly average12.6≤ 4.5 mg/L180%
February 2026Nitrogen, Kjeldahl, total [as N], weekly average2.3≤ 1 kg/d130%
February 2026Nitrogen, ammonia total [as N], monthly average10.03≤ .63 mg/L1492%
February 2026Nitrogen, ammonia total [as N], weekly average11.91≤ .93 mg/L1181%
March 2026Nitrogen, Kjeldahl, total [as N], weekly average1.1≤ 1 kg/d10%
March 2026Nitrogen, Kjeldahl, total [as N], weekly average7.7≤ 4.5 mg/L71%
March 2026Nitrogen, ammonia total [as N], monthly average1.55≤ .63 mg/L146%
March 2026Nitrogen, ammonia total [as N], weekly average6.2≤ .93 mg/L567%

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 5 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 10 mg/Lall year
Solids, total suspendedweekly average≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 2.3 kg/dall year
Solids, total suspendedweekly average≤ 3.4 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ .63 mg/Lall year
Nitrogen, ammonia total [as N]weekly average≤ .93 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly average≤ 3 mg/Lall year
Nitrogen, Kjeldahl, total [as N]weekly average≤ 4.5 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly average≤ .68 kg/dall year
Nitrogen, Kjeldahl, total [as N]weekly average≤ 1 kg/dall year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Zinc, total recoverablemonthly average≤ 82 ug/Lall year
Zinc, total recoverableweekly average≤ 82 ug/Lall year
Copper, total recoverablemonthly average≤ 9.3 ug/Lall year
Copper, total recoverableweekly average≤ 9.3 ug/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ .06 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD) (alert, not enforceable)all year
E. colimonthly geometric mean≤ 126 #/100mLall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 2.3 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 3.4 kg/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carb-5 day, 20 deg C, percent removalmonthly average minimum≥ 85 %all 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/VA0091421 · MCP: https://passage-data.com/mcp