Arlington County Environmental Services

NPDES permit VA0025143 · Major POTW · administratively continued, expires 2024-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2024-11-30 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 12 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 10 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (35)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
001pHMINIMUM >= 6 SU all year
001pHMAXIMUM <= 8.5 SU all year
001Solids, total suspendedMO AVG <= 6 mg/L all year
001Solids, total suspendedWKLY AVG <= 9 mg/L all year
001Solids, total suspendedMO AVG <= 910 kg/d all year
001Solids, total suspendedWKLY AVG <= 1400 kg/d all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 3.5 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 4.2 mg/L Jan, Feb, Mar, Nov, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= 2.7 mg/L Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 150 kg/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]WKLY AVG <= 410 kg/d Apr, May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]WKLY AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG <= .18 mg/L all year
001Phosphorus, total [as P]WKLY AVG <= .27 mg/L all year
001Phosphorus, total [as P]MO AVG <= 60 lb/d all year
001Phosphorus, total [as P]WKLY AVG <= 90 lb/d all year
001Copper, total recoverableMAXIMUM report only all year
001Flow, in conduit or thru treatment plantMO AVG <= 40 MGD (alert) all year
001Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
001Chlorine, total residualMO AVG <= .007 mg/L all year
001Chlorine, total residualWKLY AVG <= .007 mg/L all year
001Chlorine, total residualMINIMUM >= .2 mg/L all year
001E. coliMO GEOMN <= 126 #/100mL all year
001Nitrogen, Total As NANNL AVG <= 3 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 5 mg/L all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 8 mg/L all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 800 kg/d all year
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 1000 kg/d all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMAXIMUM report only all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMAXIMUM report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states