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Arlington County Environmental Services

Sewage treatment plant, major discharger, Arlington, Virginia. NPDES permit VA0025143 expired Nov 30, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form P monthly (29 values), form B yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 4 required values missing, 1 of 13 reports late

Limits in force (35)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 6 mg/Lall year
Solids, total suspendedweekly average≤ 9 mg/Lall year
Solids, total suspendedmonthly average≤ 910 kg/dall year
Solids, total suspendedweekly average≤ 1400 kg/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly average≤ 3.5 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 4.2 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 2.7 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 150 kg/dApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 410 kg/dApr–Oct
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]weekly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ .18 mg/Lall year
Phosphorus, total [as P]weekly average≤ .27 mg/Lall year
Phosphorus, total [as P]monthly average≤ 60 lb/dall year
Phosphorus, total [as P]weekly average≤ 90 lb/dall year
Copper, total recoverablemaximumreport only (ug/L)all year
Flow, in conduit or thru treatment plantmonthly average≤ 40 MGD (alert, not enforceable)all year
Flow, in conduit or thru treatment plantmaximumreport only (MGD) (alert, not enforceable)all year
Chlorine, total residualmonthly average≤ .007 mg/Lall year
Chlorine, total residualweekly average≤ .007 mg/Lall year
Chlorine, total residualminimum≥ .2 mg/Lall year
E. colimonthly geometric mean≤ 126 #/100mLall year
Nitrogen, Total As Nannual average≤ 3 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 5 mg/Lall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 8 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 800 kg/dall year
BOD, carbonaceous [5 day, 20 C]weekly average≤ 1000 kg/dall year
TU Static Renewal 7-Day Chronic Ceriodaphnia dubiamaximumreport only (tox chronic)all year
TU Static Renewal 7-Day Chronic Pimphales promelasmaximumreport only (tox chronic)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/VA0025143 · MCP: https://passage-data.com/mcp