POTTER STATION UNIT 2

NPDES permit MA0005517 · Minor NON-POTW · administratively continued, expires 2014-01-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file

This permit expired on 2014-01-31 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

2values over a limit
0required values missing, on 0 form(s)
0of 22 forms filed late

Last period with anything received: 2026-07-31. Most often over: pH (2).

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among MA permits in EPA's filings — check your permit).

Limits in force (31)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX <= 85 deg F all year
001Flow rateMO AVG report only all year
001Flow rateDAILY MX <= 250 gal/min all year
001pHMINIMUM >= 6.5 SU all year
001pHMAXIMUM <= 8.5 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 <= 15 mg/L all year
001Oxidants, total residualMO AVG <= .1 mg/L all year
001Oxidants, total residualDAILY MX <= .1 mg/L all year
001Flow, in conduit or thru treatment plantMO AVG <= 40000 gal/d all year
001Flow, in conduit or thru treatment plantDAILY MX <= 80000 gal/d all year
002pHMINIMUM >= 6.5 SU all year
002pHMAXIMUM <= 8.5 SU all year
002Solids, total suspendedMO AVG <= 100 mg/L all year
002Solids, total suspendedDAILY MX report only all year
002Oil & GreaseMO AVG report only all year
002Oil & GreaseDAILY MX <= 15 mg/L all year
002Iron, total recoverableMO AVG report only all year
002Iron, total recoverableDAILY MX report only all year
002TolueneMO AVG report only all year
002TolueneDAILY MX report only all year
002EthylbenzeneMO AVG report only all year
002EthylbenzeneMA report only all year
002BTEXDAILY MX report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Xylene [mix of m+o+p]MO AVG report only all year
002Xylene [mix of m+o+p]DAILY 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