ALLEGHENY ENERGY SUPPLY CO LLC

NPDES permit PA0255335 · Minor NON-POTW · administratively continued, expires 2026-08-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2026-08-31 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 21 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among PA permits in EPA's filings — check your permit).

Limits in force (40)

OutfallParameterStatisticLimitMonths
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedDAILY MX <= 100 mg/L all year
001Oil & GreaseMO AVG <= 15 mg/L all year
001Oil & GreaseDAILY MX <= 20 mg/L all year
001Arsenic, total [as As]MO AVG <= 10 ug/L all year
001Arsenic, total [as As]DAILY MX <= 15.7 ug/L all year
001Boron, total [as B]MO AVG <= 1.6 mg/L all year
001Boron, total [as B]DAILY MX <= 2.5 mg/L all year
001Cobalt, total [as Co]MO AVG report only all year
001Cobalt, total [as Co]DAILY MX report only all year
001Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
001Iron, total [as Fe]DAILY MX <= 7 mg/L all year
001Iron, dissolved [as Fe]MO AVG report only all year
001Iron, dissolved [as Fe]DAILY MX report only all year
001Manganese, total [as Mn]MO AVG <= 1 mg/L all year
001Manganese, total [as Mn]DAILY MX <= 1.6 mg/L all year
001Aluminum, total [as Al]MO AVG report only all year
001Aluminum, total [as Al]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
007pHINST MIN >= 6 SU all year
007pHINST MAX <= 9 SU all year
007Solids, total suspendedMO AVG <= 30 mg/L all year
007Solids, total suspendedDAILY MX <= 100 mg/L all year
007Oil & GreaseMO AVG <= 15 mg/L all year
007Oil & GreaseDAILY MX <= 20 mg/L all year
007Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
007Iron, total [as Fe]DAILY MX <= 7 mg/L all year
007Flow, in conduit or thru treatment plantMO AVG report only all year
007Flow, in conduit or thru treatment plantDAILY MX report only all year
007Perfluorooctanoic acid (PFOA)DAILY MX report only all year
007PerfluorooctanesulfonateDAILY MX report only all year
007Perfluorobutanesulfonic acid (PFBS)DAILY MX report only all year
007Hexafluoropropylene oxide dimer acid (HFPO-DA)DAILY MX report only all year
007Solids, total dissolvedMO AVG report only all year
007Solids, total dissolvedDAILY MX 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