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Hampton Roads Sanitation District

Sewage treatment plant, Onancock, Virginia. NPDES permit VA0021253, in force until Aug 31, 2031. Last 12 months: over a limit 2 times (last February 2026), 1 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form M1 monthly (21 values), form A1 yearly, form Q1 quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 17 reports late

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

Period endingParameterReportedLimitOver by
February 2026BOD, carbonaceous [5 day, 20 C], weekly average24≤ 15 mg/L60%
February 2026Nitrogen, ammonia total [as N], weekly average3.6≤ 2 mg/L80%

Limits in force (31)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6.5 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≤ 28 kg/dall year
Solids, total suspendedweekly average≤ 42 kg/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, total [as N]annual average≤ 4 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 4.6 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly averagereport only (mg/L)Jan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 6.2 mg/LApr–Oct
Phosphorus, total [as P]annual average≤ .3 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Copper, total recoverablemonthly average≤ 12 ug/Lall year
Copper, total recoverableweekly average≤ 12 ug/Lall year
Flow, in conduit or thru treatment plantmonthly average≤ .75 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD) (alert, not enforceable)all year
Chlorine, total residualmonthly average≤ .013 mg/Lall year
Chlorine, total residualweekly average≤ .016 mg/Lall year
Enterococcimonthly average≤ 35 #/100mLall year
Coliform, fecal generalmonthly average≤ 200 #/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≤ 28 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 42 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/VA0021253 · MCP: https://passage-data.com/mcp