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AK Steel Corporation

Blast Furnaces And Steel Mills, major discharger, Mansfield, Ohio. NPDES permit OH0006840, in force until Oct 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (22 values), outfall 006 form A monthly (9 values), outfall 901 form A monthly (2 values)
Renewal application due
May 4, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 36 reports late

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 274 kg/dall year001
Solids, total suspendeddaily maximum≤ 731 kg/dall year001
Oil and grease [soxhlet extr.] tot.daily maximum≤ 10 mg/Lall year001
Oil and grease [soxhlet extr.] tot.monthly average≤ 61.8 kg/dall year001
Oil and grease [soxhlet extr.] tot.daily maximum≤ 185 kg/dall year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]daily maximumreport only (mg/L)all year001
Fluoride, total [as F]monthly averagereport only (mg/L)all year001
Fluoride, total [as F]daily maximumreport only (mg/L)all year001
Zinc, total recoverablemonthly average≤ .359 kg/dall year001
Zinc, total recoverabledaily maximum≤ 1.07 kg/dall year001
Lead, total recoverablemonthly average≤ 22 ug/Lall year001
Lead, total recoverabledaily maximum≤ 435 ug/Lall year001
Lead, total recoverablemonthly average≤ .238 kg/dall year001
Lead, total recoverabledaily maximum≤ .715 kg/dall year001
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec001
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualdaily maximumreport only (mg/L)all year001
Mercury, total low levelmonthly averagereport only (ng/L)Jun001
Mercury, total low leveldaily maximumreport only (ng/L)Jun001
Toxicity [acute], Ceriodaphnia dubiamonthly averagereport only (tox acute)Aug001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)Aug001
Toxicity [chronic], Ceriodaphnia dubiamonthly averagereport only (tox chronic)Aug001
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)Aug001
pHdaily minimum≥ 6.5 SUall year006
pHdaily maximum≤ 9 SUall year006
Solids, total suspendedmonthly averagereport only (mg/L)all year006
Solids, total suspendeddaily maximumreport only (mg/L)all year006
Oil and grease [soxhlet extr.] tot.daily maximum≤ 10 mg/Lall year006
Fluoride, total [as F]monthly averagereport only (mg/L)Mar, Jun, Aug, Dec006
Fluoride, total [as F]daily maximumreport only (mg/L)Mar, Jun, Aug, Dec006
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec006
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec006
Boron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec006
Boron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec006
Zinc, total recoverablemonthly averagereport only (ug/L)all year006
Zinc, total recoverabledaily maximumreport only (ug/L)all year006
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec006
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec006
Chromium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec006
Chromium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec006
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year006
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year006
Mercury, total low levelmonthly averagereport only (ng/L)Jun006
Mercury, total low leveldaily maximumreport only (ng/L)Jun006
Temperature, water deg. centigrademonthly averagereport only (deg C)all year901
Temperature, water deg. centigradedaily maximumreport only (deg C)all year901

How strict are these limits?

Cited limits by parameter: Ohio's rules and the federal ones.

Same industry: the 56 Primary Metal Industries permits in Ohio.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OH0006840 · MCP: https://passage-data.com/mcp