CLEVELAND-CLIFFS STEEL CORP. - ROCKPORT WORKS

NPDES permit IN0059650 · Major NON-POTW · administratively continued, expires 2026-06-30 · 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 2026-06-30 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 44 forms filed late

Last period with anything received: 2026-07-31.

Reporting

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

Limits in force (82)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. fahrenheitMO AVG report only all year
001Temperature, water deg. fahrenheitDAILY MX report only all year
001pHDAILY MN >= 6 SU all year
001pHDAILY MX <= 9 SU all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Oil and grease, hexane extr methodMO AVG <= 10 mg/L all year
001Oil and grease, hexane extr methodDAILY MX <= 15 mg/L all year
001Oil and grease, hexane extr methodMO AVG report only all year
001Oil and grease, hexane extr methodDAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]DAILY MX report only all year
001Chloride [as Cl]MO AVG report only all year
001Chloride [as Cl]DAILY MX report only all year
001Nickel, total recoverableMO AVG report only all year
001Nickel, total recoverableDAILY MX report only all year
001Nickel, total recoverableMO AVG report only all year
001Nickel, total recoverableDAILY MX report only all year
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Chromium, total recoverableMO AVG report only all year
001Chromium, total recoverableDAILY MX report only all year
001Chromium, total recoverableMO AVG report only all year
001Chromium, total recoverableDAILY 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
001Chlorine, total residualMO AVG <= .098 mg/L all year
001Chlorine, total residualDAILY MX <= .228 mg/L all year
001Chlorine, total residualMO AVG report only all year
001Chlorine, total residualDAILY MX report only all year
001Flow, totalMO TOTAL report only all year
002pHDAILY MN >= 6 SU all year
002pHDAILY MX <= 9 SU all year
002Oil and grease, hexane extr methodMO AVG <= 10 mg/L all year
002Oil and grease, hexane extr methodDAILY MX <= 15 mg/L 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
002Flow, totalMO TOTAL report only all year
101Solids, total suspendedMO AVG report only all year
101Solids, total suspendedDAILY MX report only all year
101Solids, total suspendedMO AVG <= 519 lb/d all year
101Solids, total suspendedDAILY MX <= 1188 lb/d all year
101Oil and grease, hexane extr methodMO AVG report only all year
101Oil and grease, hexane extr methodDAILY MX report only all year
101Oil and grease, hexane extr methodMO AVG <= 173 lb/d all year
101Oil and grease, hexane extr methodDAILY MX <= 508 lb/d all year
101Nickel, total recoverableMO AVG report only all year
101Nickel, total recoverableDAILY MX report only all year
101Nickel, total recoverableMO AVG <= 3.95 lb/d all year
101Nickel, total recoverableDAILY MX <= 11.81 lb/d all year
101Zinc, total recoverableMO AVG report only all year
101Zinc, total recoverableDAILY MX report only all year
101Zinc, total recoverableMO AVG <= 2 lb/d all year
101Zinc, total recoverableDAILY MX <= 5.97 lb/d all year
101Lead, total recoverableMO AVG report only all year
101Lead, total recoverableDAILY MX report only all year
101Lead, total recoverableMO AVG <= 1.63 lb/d all year
101Lead, total recoverableDAILY MX <= 4.88 lb/d all year
101Chromium, total recoverableMO AVG report only all year
101Chromium, total recoverableDAILY MX report only all year
101Chromium, total recoverableMO AVG <= 5.37 lb/d all year
101Chromium, total recoverableDAILY MX <= 13.35 lb/d 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
201Chromium, hexavalent dissolved [as Cr]MO AVG report only all year
201Chromium, hexavalent dissolved [as Cr]DAILY MX report only all year
201Chromium, hexavalent dissolved [as Cr]MO AVG <= .18 lb/d all year
201Chromium, hexavalent dissolved [as Cr]DAILY MX <= .56 lb/d all year
201Flow, in conduit or thru treatment plantMO AVG report only all year
201Flow, in conduit or thru treatment plantDAILY 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