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Republic Steel - Lorain Plant

Blast Furnaces And Steel Mills, major discharger, Lorain, Ohio. NPDES permit OH0001562, in force until Jul 31, 2028. Last 12 months: over a limit 8 times (last June 2026), 6 required values missing, 16 of 181 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 002 form A monthly (44 values), outfall 003 form A monthly (34 values), outfall 004 form A monthly (43 values), outfall 005 form A monthly (42 values), outfall 009 form A monthly (2 values), outfall 102 form A monthly (28 values), and 11 more forms
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
5 values over a limit, 943 required values missing, 114 of 198 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingOutfallParameterReportedLimitOver by
November 2025102pH, daily maximum10.1≤ 9 SU—
December 2025102Mercury, total low level, monthly average16≤ 12.6 ng/L27%
December 2025105Mercury, total low level, monthly average17≤ 4.9 ng/L247%
January 2026105Mercury, total low level, monthly average10≤ 4.9 ng/L104%
March 2026614Chlorine, total residual, daily maximum.06≤ .019 mg/L216%
April 2026105Chlorine, total residual, daily maximum.1≤ 0 mg/L—
April 2026614Chlorine, total residual, daily maximum.22≤ .019 mg/L1058%
June 2026615Chlorine, total residual, daily maximum.072≤ .019 mg/L279%

Limits in force (412)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year002
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year002
Thermal Dischargedaily maximum≤ 120 MBTU/hrall year002
pHdaily minimum≥ 6.5 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year002
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec002
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec002
Silver total recoverablemonthly averagereport only (ug/L)all year002
Silver total recoverabledaily maximumreport only (ug/L)all year002
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec002
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec002
Aluminum, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec002
Aluminum, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec002
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec002
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec002
Copper, total recoverablemonthly average≤ 22 ug/Lall year002
Copper, total recoverabledaily maximum≤ 36 ug/Lall year002
Copper, total recoverablemonthly average≤ 1.2 kg/dall year002
Copper, total recoverabledaily maximum≤ 2 kg/dall year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year002
Chlorine, total residualmonthly average≤ .014 mg/LJun–Sep002
Chlorine, total residualdaily maximum≤ .024 mg/LJun–Sep002
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec002
Chlorine, total residualmonthly average≤ .77 kg/dJun–Sep002
Chlorine, total residualdaily maximum≤ 1.3 kg/dJun–Sep002
Mercury, total low levelmonthly average≤ 17.3 ng/Lall year002
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year002
Mercury, total low levelmonthly average≤ .00096 kg/dall year002
Mercury, total low leveldaily maximum≤ .094 kg/dall year002
Toxicity [acute], Ceriodaphnia dubiamonthly averagereport only (tox acute)Sep002
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)Sep002
Toxicity [chronic], Ceriodaphnia dubiamonthly averagereport only (tox chronic)Sep002
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)Sep002
Toxicity [acute], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox acute)Sep002
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox acute)Sep002
Toxicity [chronic], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox chronic)Sep002
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)Sep002
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year002
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year002
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year003
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year003
Thermal Dischargedaily maximum≤ 634 MBTU/hrall year003
pHdaily minimum≥ 6.5 SUall year003
pHdaily maximum≤ 9 SUall year003
Solids, total suspendedmonthly averagereport only (mg/L)all year003
Solids, total suspendeddaily maximumreport only (mg/L)all year003
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year003
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year003
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year003
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec003
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec003
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec003
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec003
Aluminum, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec003
Aluminum, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec003
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec003
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec003
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec003
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec003
Phenolmonthly averagereport only (ug/L)Mar, Jun, Sep, Dec003
Phenoldaily maximumreport only (ug/L)Mar, Jun, Sep, Dec003
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year003
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year003
Chlorine, total residualmonthly average≤ .013 mg/LJun–Sep003
Chlorine, total residualdaily maximum≤ .024 mg/LJun–Sep003
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec003
Chlorine, total residualmonthly average≤ 1.7 kg/dJun–Sep003
Chlorine, total residualdaily maximum≤ 3.1 kg/dJun–Sep003
Mercury, total low levelmonthly average≤ 11.9 ng/Lall year003
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year003
Mercury, total low levelmonthly average≤ .0015 kg/dall year003
Mercury, total low leveldaily maximum≤ .22 kg/dall year003
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year003
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year003
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year004
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year004
Thermal Dischargemonthly averagereport only (MBTU/hr)all year004
Thermal Dischargedaily maximumreport only (MBTU/hr)all year004
pHdaily minimum≥ 6.5 SUall year004
pHdaily maximum≤ 9 SUall year004
Solids, total suspendedmonthly averagereport only (mg/L)all year004
Solids, total suspendeddaily maximumreport only (mg/L)all year004
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year004
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year004
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year004
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Selenium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Selenium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Silver total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Silver total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Zinc, total recoverablemonthly average≤ 345 ug/Lall year004
Zinc, total recoverabledaily maximum≤ 351 ug/Lall year004
Zinc, total recoverablemonthly average≤ 36 kg/dall year004
Zinc, total recoverabledaily maximum≤ 37 kg/dall year004
Aluminum, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Aluminum, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Copper, total recoverablemonthly averagereport only (ug/L)all year004
Copper, total recoverabledaily maximumreport only (ug/L)all year004
Phenolmonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Phenoldaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year004
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year004
Chlorine, total residualmonthly average≤ .013 mg/LJun–Sep004
Chlorine, total residualdaily maximum≤ .024 mg/LJun–Sep004
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec004
Chlorine, total residualmonthly average≤ 1.4 kg/dJun–Sep004
Chlorine, total residualdaily maximum≤ 2.5 kg/dJun–Sep004
Mercury, total low levelmonthly average≤ 9.9 ng/Lall year004
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year004
Mercury, total low levelmonthly average≤ .001 kg/dall year004
Mercury, total low leveldaily maximum≤ .18 kg/dall year004
Cyanide, free availablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec004
Cyanide, free availabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec004
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year004
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year004
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year005
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year005
Thermal Dischargedaily maximum≤ 40 MBTU/hrall year005
pHdaily minimum≥ 6.5 SUall year005
pHdaily maximum≤ 9 SUall year005
Solids, total suspendedmonthly averagereport only (mg/L)all year005
Solids, total suspendeddaily maximumreport only (mg/L)all year005
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year005
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year005
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year005
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec005
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec005
Zinc, total recoverablemonthly average≤ 557 ug/Lall year005
Zinc, total recoverabledaily maximum≤ 564 ug/Lall year005
Zinc, total recoverablemonthly average≤ 16 kg/dall year005
Zinc, total recoverabledaily maximum≤ 16 kg/dall year005
Aluminum, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec005
Aluminum, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec005
Lead, total recoverablemonthly average≤ 112 ug/Lall year005
Lead, total recoverabledaily maximum≤ 4175 ug/Lall year005
Lead, total recoverablemonthly average≤ 3.2 kg/dall year005
Lead, total recoverabledaily maximum≤ 120 kg/dall year005
Copper, total recoverablemonthly average≤ 27 ug/Lall year005
Copper, total recoverabledaily maximum≤ 44 ug/Lall year005
Copper, total recoverablemonthly average≤ .76 kg/dall year005
Copper, total recoverabledaily maximum≤ 1.2 kg/dall year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year005
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year005
Chlorine, total residualmonthly average≤ .016 mg/LJun–Sep005
Chlorine, total residualdaily maximum≤ .027 mg/LJun–Sep005
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec005
Chlorine, total residualmonthly average≤ .45 kg/dJun–Sep005
Chlorine, total residualdaily maximum≤ .76 kg/dJun–Sep005
Mercury, total low levelmonthly average≤ 4.9 ng/Lall year005
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year005
Mercury, total low levelmonthly average≤ .00014 kg/dall year005
Mercury, total low leveldaily maximum≤ .048 kg/dall year005
Toxicity [acute], Ceriodaphnia dubiadaily maximum≤ 1 tox acuteMar, Jun, Sep, Dec005
Toxicity [chronic], Ceriodaphnia dubiamonthly average≤ 4.44 tox chronicMar, Jun, Sep, Dec005
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum≤ 1 tox acuteMar, Jun, Sep, Dec005
Toxicity [chronic], Pimephales promelas [Fathead Minnow]monthly average≤ 4.44 tox chronicMar, Jun, Sep, Dec005
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year005
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year005
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jun007
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jun007
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Jun008
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Jun008
Solids, total suspendedmonthly averagereport only (mg/L)Mar, Jun, Sep, Dec009
Solids, total suspendeddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec009
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year102
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year102
pHdaily minimum≥ 6.5 SUall year102
pHdaily maximum≤ 9 SUall year102
Solids, total suspendedmonthly averagereport only (mg/L)all year102
Solids, total suspendeddaily maximumreport only (mg/L)all year102
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year102
Nitrogen, ammonia total [as N]monthly average≤ 2.47 mg/LMay–Oct102
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec102
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan, Feb, Mar, Apr, Nov, Dec102
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec102
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec102
Silver total recoverablemonthly averagereport only (ug/L)all year102
Silver total recoverabledaily maximumreport only (ug/L)all year102
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec102
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec102
Aluminum, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec102
Aluminum, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec102
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec102
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec102
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec102
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec102
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year102
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year102
Chlorine, total residualmonthly average≤ .014 mg/LJun–Sep102
Chlorine, total residualdaily maximum≤ .024 mg/LJun–Sep102
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec102
Mercury, total low levelmonthly average≤ 12.6 ng/Lall year102
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year102
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year102
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year102
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year103
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year103
pHdaily minimum≥ 6.5 SUall year103
pHdaily maximum≤ 9 SUall year103
Solids, total suspendedmonthly averagereport only (mg/L)all year103
Solids, total suspendeddaily maximumreport only (mg/L)all year103
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year103
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year103
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year103
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec103
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec103
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec103
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec103
Aluminum, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec103
Aluminum, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec103
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec103
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec103
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec103
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec103
Phenolmonthly averagereport only (ug/L)Mar, Jun, Sep, Dec103
Phenoldaily maximumreport only (ug/L)Mar, Jun, Sep, Dec103
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year103
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year103
Chlorine, total residualmonthly average≤ .013 mg/LJun–Sep103
Chlorine, total residualdaily maximum≤ .024 mg/LJun–Sep103
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec103
Mercury, total low levelmonthly average≤ 11.9 ng/Lall year103
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year103
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year103
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year103
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year105
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year105
pHdaily minimum≥ 6.5 SUall year105
pHdaily maximum≤ 9 SUall year105
Solids, total suspendedmonthly averagereport only (mg/L)all year105
Solids, total suspendeddaily maximumreport only (mg/L)all year105
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year105
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year105
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year105
Iron, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec105
Iron, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec105
Zinc, total recoverablemonthly averagereport only (ug/L)all year105
Zinc, total recoverabledaily maximumreport only (ug/L)all year105
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec105
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec105
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec105
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec105
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year105
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year105
Chlorine, total residualmonthly average≤ .016 mg/LJun–Sep105
Chlorine, total residualdaily maximum≤ .027 mg/LJun–Sep105
Chlorine, total residualdaily maximum≤ 0 mg/LJan, Feb, Mar, Apr, May, Oct, Nov, Dec105
Mercury, total low levelmonthly average≤ 4.9 ng/Lall year105
Mercury, total low leveldaily maximum≤ 1700 ng/Lall year105
Toxicity [acute], Ceriodaphnia dubiamonthly averagereport only (tox acute)Mar, Jun, Sep, Dec105
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)Mar, Jun, Sep, Dec105
Toxicity [chronic], Ceriodaphnia dubiamonthly averagereport only (tox chronic)Mar, Jun, Sep, Dec105
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)Mar, Jun, Sep, Dec105
Toxicity [acute], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox acute)Mar, Jun, Sep, Dec105
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox acute)Mar, Jun, Sep, Dec105
Toxicity [chronic], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox chronic)Mar, Jun, Aug, Dec105
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)Mar, Jun, Aug, Dec105
Solids, total dissolved- 180 deg. Cmonthly averagereport only (mg/L)all year105
Solids, total dissolved- 180 deg. Cdaily maximumreport only (mg/L)all year105
pHdaily minimumreport only (SU)all year602
pHdaily maximumreport only (SU)all year602
Solids, total suspendedmonthly average≤ 87.9 kg/dall year602
Solids, total suspendeddaily maximum≤ 264 kg/dall year602
Nitrogen, ammonia total [as N]monthly average≤ 9.9 kg/dall year602
Nitrogen, ammonia total [as N]daily maximum≤ 29.6 kg/dall year602
Cyanide, total [as CN]monthly average≤ 2.96 kg/dall year602
Cyanide, total [as CN]daily maximum≤ 5.91 kg/dall year602
Lead, total [as Pb]monthly average≤ .296 kg/dall year602
Lead, total [as Pb]daily maximum≤ .89 kg/dall year602
Zinc, total [as Zn]monthly average≤ .443 kg/dall year602
Zinc, total [as Zn]daily maximum≤ 1.33 kg/dall year602
Copper, total recoverablemonthly averagereport only (ug/L)all year602
Copper, total recoverabledaily maximumreport only (ug/L)all year602
Phenolics, total recoverablemonthly average≤ .099 kg/dall year602
Phenolics, total recoverabledaily maximum≤ .197 kg/dall year602
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year602
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year602
Mercury, total low levelmonthly averagereport only (ng/L)all year602
Mercury, total low leveldaily maximumreport only (ng/L)all year602
pHdaily minimumreport only (SU)all year603
pHdaily maximumreport only (SU)all year603
Solids, total suspendedmonthly average≤ 56.9 kg/dall year603
Solids, total suspendeddaily maximum≤ 168 kg/dall year603
Oil and grease, hexane extr methodmonthly average≤ 4.01 kg/dall year603
Oil and grease, hexane extr methoddaily maximum≤ 12.1 kg/dall year603
Lead, total [as Pb]monthly average≤ .43 kg/dall year603
Lead, total [as Pb]daily maximum≤ 1.29 kg/dall year603
Zinc, total [as Zn]monthly average≤ .645 kg/dall year603
Zinc, total [as Zn]daily maximum≤ 1.94 kg/dall year603
Copper, total recoverablemonthly averagereport only (ug/L)all year603
Copper, total recoverabledaily maximumreport only (ug/L)all year603
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year603
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year603
Mercury, total low levelmonthly averagereport only (ng/L)all year603
Mercury, total low leveldaily maximumreport only (ng/L)all year603
pHdaily minimumreport only (SU)all year604
pHdaily maximumreport only (SU)all year604
Solids, total suspendedmonthly average≤ 161 kg/dall year604
Solids, total suspendeddaily maximum≤ 428 kg/dall year604
Oil and grease, hexane extr methoddaily maximum≤ 107 kg/dall year604
Zinc, total recoverablemonthly averagereport only (ug/L)all year604
Zinc, total recoverabledaily maximumreport only (ug/L)all year604
Lead, total recoverablemonthly averagereport only (ug/L)all year604
Lead, total recoverabledaily maximumreport only (ug/L)all year604
Copper, total recoverablemonthly averagereport only (ug/L)all year604
Copper, total recoverabledaily maximumreport only (ug/L)all year604
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year604
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year604
Mercury, total low levelmonthly averagereport only (ng/L)all year604
Mercury, total low leveldaily maximumreport only (ng/L)all year604
pHdaily minimumreport only (SU)all year605
pHdaily maximumreport only (SU)all year605
Solids, total suspendedmonthly average≤ 175 kg/dall year605
Solids, total suspendeddaily maximum≤ 467 kg/dall year605
Oil and grease, hexane extr methoddaily maximum≤ 117 kg/dall year605
Zinc, total recoverablemonthly averagereport only (ug/L)all year605
Zinc, total recoverabledaily maximumreport only (ug/L)all year605
Lead, total recoverablemonthly averagereport only (ug/L)all year605
Lead, total recoverabledaily maximumreport only (ug/L)all year605
Copper, total recoverablemonthly averagereport only (ug/L)all year605
Copper, total recoverabledaily maximumreport only (ug/L)all year605
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year605
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year605
Mercury, total low levelmonthly averagereport only (ng/L)all year605
Mercury, total low leveldaily maximumreport only (ng/L)all year605
pHdaily minimumreport only (SU)all year612
pHdaily maximumreport only (SU)all year612
Solids, total suspendedmonthly average≤ 17 kg/dall year612
Solids, total suspendeddaily maximum≤ 47.7 kg/dall year612
Oil and grease [soxhlet extr.] tot.monthly average≤ 3.4 kg/dall year612
Oil and grease [soxhlet extr.] tot.daily maximum≤ 10.2 kg/dall year612
Lead, total [as Pb]monthly average≤ .2 kg/dall year612
Lead, total [as Pb]daily maximum≤ .61 kg/dall year612
Zinc, total [as Zn]monthly average≤ .31 kg/dall year612
Zinc, total [as Zn]daily maximum≤ .92 kg/dall year612
Copper, total recoverablemonthly averagereport only (ug/L)all year612
Copper, total recoverabledaily maximumreport only (ug/L)all year612
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year612
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year612
Mercury, total low levelmonthly averagereport only (ng/L)all year612
Mercury, total low leveldaily maximumreport only (ng/L)all year612
pHdaily minimum≥ 6.5 SUall year614
pHdaily maximum≤ 9 SUall year614
Solids, total suspendeddaily maximum≤ 65 mg/Lall year614
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year614
Zinc, total recoverablemonthly averagereport only (ug/L)all year614
Zinc, total recoverabledaily maximumreport only (ug/L)all year614
Lead, total recoverablemonthly averagereport only (ug/L)all year614
Lead, total recoverabledaily maximumreport only (ug/L)all year614
Copper, total recoverablemonthly averagereport only (ug/L)all year614
Copper, total recoverabledaily maximumreport only (ug/L)all year614
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year614
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year614
Chlorine, total residualdaily maximum≤ .019 mg/Lall year614
Mercury, total low levelmonthly averagereport only (ng/L)all year614
Mercury, total low leveldaily maximumreport only (ng/L)all year614
pHdaily minimum≥ 6.5 SUall year615
pHdaily maximum≤ 9 SUall year615
Solids, total suspendeddaily maximum≤ 65 mg/Lall year615
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year615
Zinc, total recoverablemonthly averagereport only (ug/L)all year615
Zinc, total recoverabledaily maximumreport only (ug/L)all year615
Lead, total recoverablemonthly averagereport only (ug/L)all year615
Lead, total recoverabledaily maximumreport only (ug/L)all year615
Copper, total recoverablemonthly averagereport only (ug/L)all year615
Copper, total recoverabledaily maximumreport only (ug/L)all year615
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year615
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year615
Chlorine, total residualdaily maximum≤ .019 mg/Lall year615
Mercury, total low levelmonthly averagereport only (ng/L)all year615
Mercury, total low leveldaily maximumreport only (ng/L)all year615
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year901
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year901
pHdaily minimumreport only (SU)all year901
pHdaily maximumreport only (SU)all year901
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year901
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year901
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec901
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec901
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec901
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec901
Copper, total recoverablemonthly averagereport only (ug/L)all year901
Copper, total recoverabledaily maximumreport only (ug/L)all year901
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year901
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year901
Mercury, total low levelmonthly averagereport only (ng/L)all year901
Mercury, total low leveldaily maximumreport only (ng/L)all year901
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)all year902
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)all year902
pHdaily minimumreport only (SU)all year902
pHdaily maximumreport only (SU)all year902
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year902
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year902
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec902
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec902
Lead, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec902
Lead, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec902
Copper, total recoverablemonthly averagereport only (ug/L)all year902
Copper, total recoverabledaily maximumreport only (ug/L)all year902
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year902
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year902
Mercury, total low levelmonthly averagereport only (ng/L)all year902
Mercury, total low leveldaily maximumreport only (ng/L)all year902

New limits from Aug 1, 2027

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Toxicity [acute], Ceriodaphnia dubia, daily maximum1 tox acute (Mar, Jun, Sep, Dec)new——
Toxicity [acute], Pimephales promelas [Fathead Minnow], daily maximum1 tox acute (Mar, Jun, Sep, Dec)new——
Toxicity [chronic], Ceriodaphnia dubia, monthly average4.44 tox chronic (Mar, Jun, Sep, Dec)new——
Toxicity [chronic], Pimephales promelas [Fathead Minnow], monthly average4.44 tox chronic (Mar, Jun, Aug, Dec)new——
Zinc, total recoverable, daily maximum564 ug/Lnew167 ug/L (10 values)0.296×
Zinc, total recoverable, monthly average557 ug/Lnew167 ug/L (10 values)0.3×

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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