W MIFFLIN SANI SEW & STORMWATER AUTH ALLEGHENY CNTY

NPDES permit PA0026522 · Major POTW · effective, expires 2031-03-31 · 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

4values over a limit
1required values missing, on 1 form(s)
1of 15 forms filed late

Last period with anything received: 2026-06-30. Most often over: Nitrogen, ammonia total [as N] (4).

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (56)

OutfallParameterStatisticLimitMonths
101Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101BOD, 5-day, 20 deg. CMO AVG report only all year
101BOD, 5-day, 20 deg. CDAILY MX report only all year
101pHINST MIN >= 6 SU all year
101pHINST MAX <= 9 SU all year
101Solids, total suspendedMO AVG <= 30 mg/L all year
101Solids, total suspendedWKLY AVG <= 45 mg/L all year
101Solids, total suspendedMO AVG <= 300 lb/d all year
101Solids, total suspendedWKLY AVG <= 450 lb/d all year
101Solids, total suspendedMO AVG report only all year
101Solids, total suspendedMO AVG report only all year
101Solids, total suspendedDAILY MX report only all year
101Nitrogen, total [as N]ANNL AVG report only all year
101Nitrogen, total [as N]ANNL AVG report only all year
101Nitrogen, ammonia total [as N]MO AVG <= 2.83 mg/L Jan, Feb, Mar, Apr, Nov, Dec
101Nitrogen, ammonia total [as N]MO AVG <= 1.92 mg/L May, Jun, Jul, Aug, Sep, Oct
101Nitrogen, ammonia total [as N]WKLY AVG <= 4.24 mg/L Jan, Feb, Mar, Apr, Nov, Dec
101Nitrogen, ammonia total [as N]WKLY AVG <= 2.88 mg/L May, Jun, Jul, Aug, Sep, Oct
101Nitrogen, ammonia total [as N]MO AVG <= 28.32 lb/d Jan, Feb, Mar, Apr, Nov, Dec
101Nitrogen, ammonia total [as N]MO AVG <= 19.21 lb/d May, Jun, Jul, Aug, Sep, Oct
101Nitrogen, ammonia total [as N]WKLY AVG <= 42.43 lb/d Jan, Feb, Mar, Apr, Nov, Dec
101Nitrogen, ammonia total [as N]WKLY AVG <= 28.82 lb/d May, Jun, Jul, Aug, Sep, Oct
101Phosphorus, total [as P]ANNL AVG report only all year
101Phosphorus, total [as P]ANNL AVG report only all year
101Arsenic, total [as As]DAILY MX report only all year
101Chromium, hexavalent [as Cr]DAILY MX report only all year
101Copper, total [as Cu]MO AVG report only all year
101Copper, total [as Cu]DAILY MX report only all year
101Iron, total [as Fe]QRTR AVG report only all year
101Iron, total [as Fe]QRTR AVG report only all year
101Iron, dissolved [as Fe]DAILY MX report only all year
101Manganese, total [as Mn]QRTR AVG report only all year
101Manganese, total [as Mn]QRTR AVG report only all year
101Zinc, total [as Zn]MO AVG report only all year
101Zinc, total [as Zn]DAILY MX report only all year
101Aluminum, total [as Al]QRTR AVG report only all year
101Aluminum, total [as Al]QRTR AVG report only all year
101Flow, in conduit or thru treatment plantMO AVG report only all year
101Flow, in conduit or thru treatment plantDAILY MX report only all year
101Cyanide, free availableMO AVG report only all year
101Cyanide, free availableDAILY MX report only all year
101Perfluorooctanoic acid (PFOA)DAILY MX report only all year
101PerfluorooctanesulfonateDAILY MX report only all year
101Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
101Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
101Ultraviolet light dosageINST MIN report only all year
101Ultraviolet light dosageMO AVG report only all year
101Coliform, fecal generalGEO MEAN <= 200 #/100mL May, Jun, Jul, Aug, Sep
101Coliform, fecal generalGEO MEAN <= 2000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
101Coliform, fecal generalINST MAX <= 1000 #/100mL May, Jun, Jul, Aug, Sep
101Coliform, fecal generalINST MAX <= 10000 #/100mL Jan, Feb, Mar, Apr, Oct, Nov, Dec
101BOD, carbonaceous [5 day, 20 C]MO AVG <= 25 mg/L all year
101BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 37.5 mg/L all year
101BOD, carbonaceous [5 day, 20 C]MO AVG <= 250 lb/d all year
101BOD, carbonaceous [5 day, 20 C]WKLY AVG <= 376 lb/d 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