Loudoun County Sanitation Authority

NPDES permit VA0091383 · Major NON-POTW · effective, expires 2028-07-31 · 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.

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

2values over a limit
0required values missing, on 0 form(s)
0of 26 forms filed late

Last period with anything received: 2026-07-31. Most often over: Chlorine, total residual (2).

Reporting

Reports are due about 10 days after each monitoring period ends (the most common figure among VA permits in EPA's filings — check your permit).

Limits in force (113)

OutfallParameterStatisticLimitMonths
001TurbidityMO AVG <= .5 NTU all year
001TurbidityMO AVG <= .5 NTU all year
001Oxygen, dissolved [DO]INST MIN >= 6 mg/L all year
001Oxygen, dissolved [DO]MINIMUM >= 6 mg/L all year
001Oxygen demand, chem. [low level] [COD]MO AVG <= 10 mg/L all year
001Oxygen demand, chem. [low level] [COD]MO AVG <= 10 mg/L all year
001Oxygen demand, chem. [low level] [COD]WKLY AVG <= 15 mg/L all year
001Oxygen demand, chem. [low level] [COD]WKLY AVG <= 20 mg/L all year
001Oxygen demand, chem. [low level] [COD]MO AVG <= 420 kg/d all year
001Oxygen demand, chem. [low level] [COD]MO AVG <= 620 kg/d all year
001Oxygen demand, chem. [low level] [COD]WKLY AVG <= 620 kg/d all year
001Oxygen demand, chem. [low level] [COD]WKLY AVG <= 1250 kg/d all year
001pHINST MIN >= 6 SU all year
001pHMINIMUM >= 6 SU all year
001pHINST MAX <= 9 SU all year
001pHMAXIMUM <= 9 SU all year
001Solids, total suspendedMO AVG <= 1 mg/L all year
001Solids, total suspendedMO AVG <= 1 mg/L all year
001Solids, total suspendedWKLY AVG <= 1.5 mg/L all year
001Solids, total suspendedWKLY AVG <= 2 mg/L all year
001Solids, total suspendedMO AVG <= 42 kg/d all year
001Solids, total suspendedMO AVG <= 62 kg/d all year
001Solids, total suspendedWKLY AVG <= 62 kg/d all year
001Solids, total suspendedWKLY AVG <= 120 kg/d all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 1 mg/L all year
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 1 mg/L all year
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 1.5 mg/L all year
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 2 mg/L all year
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 92 lb/d all year
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 140 lb/d all year
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 140 lb/d all year
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 280 lb/d all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Phosphorus, total [as P]MO AVG <= .1 mg/L all year
001Phosphorus, total [as P]MO AVG <= .1 mg/L all year
001Phosphorus, total [as P]WKLY AVG <= .15 mg/L all year
001Phosphorus, total [as P]WKLY AVG <= .2 mg/L all year
001Phosphorus, total [as P]MO AVG <= 9.2 lb/d all year
001Phosphorus, total [as P]MO AVG <= 14 lb/d all year
001Phosphorus, total [as P]WKLY AVG <= 14 lb/d all year
001Phosphorus, total [as P]WKLY AVG <= 28 lb/d all year
001Flow, in conduit or thru treatment plantMO AVG <= 11 MGD (alert) all year
001Flow, in conduit or thru treatment plantMO AVG <= 16.5 MGD (alert) all year
001Flow, in conduit or thru treatment plantDAILY MX report only (alert) all year
001Flow, in conduit or thru treatment plantDAILY MX report only (alert) all year
001E. coliMO GEOMN <= 2 #/100mL all year
001E. coliMO GEOMN <= 2 #/100mL all year
001Nitrogen, Total As NANNL AVG <= 4 mg/L all year
001Nitrogen, Total As NANNL AVG <= 3 mg/L all year
001Phosphorus, Total As PMO AVG <= .1 mg/L all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMAXIMUM report only 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
001TU Static Renewal 7-Day Chronic Pimphales promelasMAXIMUM report only all year
002pHMINIMUM >= 6 SU all year
002pHMAXIMUM <= 9 SU all year
002Solids, total suspendedAVERAGE report only all year
002Solids, total suspendedMAXIMUM report only all year
002Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
002Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
002Chlorine, total residualAVERAGE <= .016 mg/L all year
002Chlorine, total residualMAXIMUM <= .016 mg/L all year
003pHMINIMUM >= 6 SU all year
003pHMAXIMUM <= 9 SU all year
003Solids, total suspendedAVERAGE report only all year
003Solids, total suspendedMAXIMUM report only all year
003Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
003Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
003Chlorine, total residualAVERAGE <= .016 mg/L all year
003Chlorine, total residualMAXIMUM <= .016 mg/L all year
004pHMINIMUM >= 6 SU all year
004pHMAXIMUM <= 9 SU all year
004Solids, total suspendedAVERAGE report only all year
004Solids, total suspendedMAXIMUM report only all year
004Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
004Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
004Chlorine, total residualAVERAGE <= .016 mg/L all year
004Chlorine, total residualMAXIMUM <= .016 mg/L all year
005pHMINIMUM >= 6 SU all year
005pHMAXIMUM <= 9 SU all year
005Solids, total suspendedAVERAGE report only all year
005Solids, total suspendedMAXIMUM report only all year
005Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
005Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
005Chlorine, total residualAVERAGE <= .016 mg/L all year
005Chlorine, total residualMAXIMUM <= .016 mg/L all year
006pHMINIMUM >= 6 SU all year
006pHMAXIMUM <= 9 SU all year
006Solids, total suspendedAVERAGE report only all year
006Solids, total suspendedMAXIMUM report only all year
006Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
006Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
006Chlorine, total residualAVERAGE <= .016 mg/L all year
006Chlorine, total residualMAXIMUM <= .016 mg/L all year
007pHMINIMUM >= 6 SU all year
007pHMAXIMUM <= 9 SU all year
007Solids, total suspendedAVERAGE report only all year
007Solids, total suspendedMAXIMUM report only all year
007Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
007Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
007Chlorine, total residualAVERAGE <= .016 mg/L all year
007Chlorine, total residualMAXIMUM <= .016 mg/L all year
008pHMINIMUM >= 6 SU all year
008pHMAXIMUM <= 9 SU all year
008Solids, total suspendedAVERAGE report only all year
008Solids, total suspendedMAXIMUM report only all year
008Flow, in conduit or thru treatment plantAVERAGE report only (alert) all year
008Flow, in conduit or thru treatment plantMAXIMUM report only (alert) all year
008Chlorine, total residualAVERAGE <= .016 mg/L all year
008Chlorine, total residualMAXIMUM <= .016 mg/L 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