Blackstone Town

NPDES permit VA0025194 · Major POTW · effective, expires 2030-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

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

1values over a limit
0required values missing, on 0 form(s)
0of 28 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (1).

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 (40)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]DAILY MN >= 6 mg/L all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG <= 14 mg/L all year
001Solids, total suspendedWKLY AVG <= 22 mg/L all year
001Solids, total suspendedMO AVG <= 120 kg/d all year
001Solids, total suspendedWKLY AVG <= 180 kg/d all year
001Solids, total suspendedMO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= .69 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]MO AVG <= 2 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, ammonia total [as N]WKLY AVG <= .87 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, ammonia total [as N]WKLY AVG <= 2.5 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 15 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 2.8 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 22 mg/L Jan, Feb, Mar, Apr, Dec
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 4.2 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 120 kg/d Jan, Feb, Mar, Apr, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG <= 23 kg/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 180 kg/d Jan, Feb, Mar, Apr, Dec
001Nitrogen, Kjeldahl, total [as N]WKLY AVG <= 35 kg/d May, Jun, Jul, Aug, Sep, Oct, Nov
001Hardness, total [as CaCO3]MINIMUM >= 100 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG <= 2.2 MGD (alert) all year
001Flow, in conduit or thru treatment plantDAILY MX report only (alert) all year
001Chlorine, total residualMO AVG <= 7 ug/L all year
001Chlorine, total residualWKLY AVG <= 7.4 ug/L all year
001Chlorine, total residualINST MIN >= .6 mg/L all year
001E. coliGEO MEAN <= 126 #/100mL all year
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 15 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 11 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 23 mg/L Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 17 mg/L May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 130 kg/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]MO AVG <= 95 kg/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 190 kg/d Jan, Feb, Mar, Apr, Dec
001BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 140 kg/d May, Jun, Jul, Aug, Sep, Oct, Nov
001BOD, carbonaceous [5 day, 20 C]MO AVG report only all year
001BOD, carb-5 day, 20 deg C, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001TU Static Renewal 7-Day Chronic Ceriodaphnia dubiaMAXIMUM <= 1.06 tox chronic all year
001TU Static Renewal 7-Day Chronic Pimphales promelasMAXIMUM <= 1.05 tox chronic 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