MC OPCO LLC

NPDES permit PA0020109 · Minor NON-POTW · expired, expires 2025-12-31 · 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.

This permit expired on 2025-12-31 and is expired: 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 5 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 (27)

OutfallParameterStatisticLimitMonths
001Oxygen, dissolved [DO]INST MIN >= 5 mg/L all year
001pHINST MIN >= 6 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedDAILY MX <= 100 mg/L all year
001Solids, total suspendedANNL AVG <= 30 mg/L all year
001Solids, total suspendedINST MAX <= 60 mg/L all year
001Oil & GreaseSEMI AVG <= 15 mg/L all year
001Oil & GreaseINST MAX <= 30 mg/L all year
001Iron, dissolved [as Fe]ANNL AVG report only all year
001Iron, dissolved [as Fe]INST MAX <= 7 mg/L all year
001Benzene, ethylbenzene, toluene, xylene combinationANNL AVG report only all year
001Benzene, ethylbenzene, toluene, xylene combinationINST MAX <= .25 mg/L all year
001BenzeneANNL AVG report only all year
001BenzeneINST MAX <= .0025 mg/L all year
001Flow, in conduit or thru treatment plantANNL AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualANNL AVG report only all year
001Chlorine, total residualINST MAX <= .05 mg/L all year
001Duration of dischargeINST MAX report only all year
002pHINST MIN report only all year
002pHINST MAX report only all year
002Solids, total suspendedDAILY MX <= 100 mg/L all year
002Oil & GreaseSEMI AVG <= 15 mg/L all year
002Oil & GreaseINST MAX <= 30 mg/L all year
002Nitrogen, Kjeldahl, total [as N]INST MAX report only all year
002Nitrite + Nitrate total [as N]INST MAX report only all year
002Phosphorus, total [as P]INST MAX 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