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US Steel Corp

Blast Furnaces And Steel Mills, major discharger, West Mifflin, Pennsylvania. NPDES permit PA0004073, in force until Jul 31, 2030. Last 12 months: over a limit 2 times (last March 2026), 101 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (19 values), outfall 003 form A monthly (11 values), outfall 101 form A monthly (16 values), outfall 201 form A monthly (22 values), outfall 201 form Q quarterly (4 values), outfall 301 form A monthly (11 values), and 5 more forms
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 108 reports late

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

Period endingParameterReportedLimitOver by
March 2026Oil & Grease, daily maximum45.7 mg/L≤ 30 mg/L52%
March 2026Oil & Grease, monthly average13.4 mg/L≤ 10 mg/L34%

Limits in force (129)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitinstantaneous maximum≤ 110 deg Fall year001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Oil & Greasemonthly average≤ 15 mg/Lall year001
Oil & Greasedaily maximum≤ 30 mg/Lall year001
Chromium, hexavalent [as Cr]monthly averagereport only (mg/L)all year001
Chromium, hexavalent [as Cr]daily maximumreport only (mg/L)all year001
Copper, total [as Cu]monthly averagereport only (mg/L)all year001
Copper, total [as Cu]daily maximumreport only (mg/L)all year001
Iron, total [as Fe]monthly averagereport only (mg/L)all year001
Iron, total [as Fe]daily maximumreport only (mg/L)all year001
Zinc, total [as Zn]monthly averagereport only (mg/L)all year001
Zinc, total [as Zn]daily maximumreport only (mg/L)all year001
Aluminum, total [as Al]monthly averagereport only (mg/L)all year001
Aluminum, total [as Al]daily maximumreport only (mg/L)all year001
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 residualmonthly average≤ .5 mg/Lall year001
Chlorine, total residualdaily maximum≤ 1 mg/Lall year001
Perfluorooctanoic acid (PFOA)daily maximumreport only (ng/L)all year001
Perfluorooctanesulfonatedaily maximumreport only (ng/L)all year001
Perfluorobutanesulfonic acid (PFBS)daily maximumreport only (ng/L)all year001
Hexafluoropropylene oxide dimer acid (HFPO-DA)daily maximumreport only (ng/L)all year001
Temperature, water deg. fahrenheitinstantaneous maximum≤ 110 deg Fall year003
pHinstantaneous minimum≥ 6 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Oil & Greasemonthly average≤ 15 mg/Lall year003
Oil & Greasedaily maximum≤ 30 mg/Lall year003
Butyl benzyl phthalatemonthly averagereport only (mg/L)all year003
Butyl benzyl phthalatedaily maximumreport only (mg/L)all year003
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≤ .5 mg/Lall year003
Chlorine, total residualdaily maximum≤ 1 mg/Lall year003
Solids, total suspendeddaily maximumreport only (mg/L)all year004
Oil & Greasedaily maximumreport only (mg/L)all year004
Nitrogen, total [as N]daily maximumreport only (mg/L)all year004
Phosphorus, total [as P]daily maximumreport only (mg/L)all year004
Copper, total [as Cu]daily maximumreport only (mg/L)all year004
Iron, total [as Fe]daily maximumreport only (mg/L)all year004
Lead, total [as Pb]daily maximumreport only (mg/L)all year004
Zinc, total [as Zn]daily maximumreport only (mg/L)all year004
Aluminum, total [as Al]daily maximumreport only (mg/L)all year004
Solids, total suspendeddaily maximumreport only (mg/L)all year005
Oil & Greasedaily maximumreport only (mg/L)all year005
Nitrogen, total [as N]daily maximumreport only (mg/L)all year005
Phosphorus, total [as P]daily maximumreport only (mg/L)all year005
Copper, total [as Cu]daily maximumreport only (mg/L)all year005
Iron, total [as Fe]daily maximumreport only (mg/L)all year005
Lead, total [as Pb]daily maximumreport only (mg/L)all year005
Zinc, total [as Zn]daily maximumreport only (mg/L)all year005
Aluminum, total [as Al]daily maximumreport only (mg/L)all year005
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/Lall year101
pHinstantaneous minimum≥ 6 SUall year101
pHinstantaneous maximum≤ 9 SUall year101
Solids, total suspendedmonthly average≤ 30 mg/Lall year101
Solids, total suspendedweekly average≤ 45 mg/Lall year101
Nitrogen, total [as N]monthly averagereport only (mg/L)all year101
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year101
Phosphorus, total [as P]monthly averagereport only (mg/L)all year101
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year101
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year101
Chlorine, total residualmonthly average≤ 1.4 mg/Lall year101
Chlorine, total residualinstantaneous maximum≤ 3.3 mg/Lall year101
Coliform, fecal generalgeometric mean≤ 2000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec101
Coliform, fecal generalgeometric mean≤ 200 #/100mLMay–Sep101
Coliform, fecal generalinstantaneous maximum≤ 10000 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec101
Coliform, fecal generalinstantaneous maximum≤ 1000 #/100mLMay–Sep101
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year101
BOD, carbonaceous [5 day, 20 C]weekly average≤ 40 mg/Lall year101
pHinstantaneous minimum≥ 6 SUall year201
pHinstantaneous maximum≤ 10 SUall year201
Solids, total suspendedmonthly average≤ 30 mg/Lall year201
Solids, total suspendeddaily maximum≤ 60 mg/Lall year201
Solids, total suspendedmonthly average≤ 870 lb/dall year201
Solids, total suspendeddaily maximum≤ 1990 lb/dall year201
Oil & Greasemonthly average≤ 10 mg/Lall year201
Oil & Greasedaily maximum≤ 25 mg/Lall year201
Oil & Greasemonthly average≤ 291 lb/dall year201
Oil & Greasedaily maximum≤ 849 lb/dall year201
Iron, total [as Fe]monthly average≤ 3.5 mg/Lall year201
Iron, total [as Fe]daily maximum≤ 7 mg/Lall year201
Lead, total [as Pb]monthly average≤ .15 mg/Lall year201
Lead, total [as Pb]daily maximum≤ .45 mg/Lall year201
Lead, total [as Pb]monthly average≤ 3.62 lb/dall year201
Lead, total [as Pb]daily maximum≤ 10.9 lb/dall year201
Zinc, total [as Zn]monthly average≤ .1 mg/Lall year201
Zinc, total [as Zn]daily maximum≤ .3 mg/Lall year201
Zinc, total [as Zn]monthly average≤ 4.38 lb/dall year201
Zinc, total [as Zn]daily maximum≤ 13.1 lb/dall year201
Tetrachloroethylenedaily maximum≤ .032 mg/Lall year201
Tetrachloroethylenedaily maximum≤ .67 lb/dall year201
Naphthalenedaily maximum≤ .022 mg/Lall year201
Naphthalenedaily maximum≤ .45 lb/dall year201
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year201
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year201
pHinstantaneous minimum≥ 6 SUall year301
pHinstantaneous maximum≤ 9 SUall year301
Solids, total suspendedmonthly average≤ 24 mg/Lall year301
Solids, total suspendeddaily maximum≤ 48 mg/Lall year301
Solids, total suspendedmonthly average≤ 3200 lb/dall year301
Solids, total suspendeddaily maximum≤ 8530 lb/dall year301
Oil & Greasemonthly average≤ 10 mg/Lall year301
Oil & Greasedaily maximum≤ 30 mg/Lall year301
Oil & Greasedaily maximum≤ 2140 lb/dall year301
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year301
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year301
pHinstantaneous minimum≥ 6 SUall year601
pHinstantaneous maximum≤ 9 SUall year601
Solids, total suspendedmonthly average≤ 24 mg/Lall year601
Solids, total suspendeddaily maximum≤ 48 mg/Lall year601
Solids, total suspendedmonthly average≤ 3200 lb/dall year601
Solids, total suspendeddaily maximum≤ 8530 lb/dall year601
Oil & Greasemonthly average≤ 10 mg/Lall year601
Oil & Greasedaily maximum≤ 30 mg/Lall year601
Oil & Greasedaily maximum≤ 2140 lb/dall year601
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year601
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year601
pHinstantaneous minimum≥ 6 SUall year701
pHinstantaneous maximum≤ 9 SUall year701
Solids, total suspendedmonthly average≤ 24 mg/Lall year701
Solids, total suspendeddaily maximum≤ 48 mg/Lall year701
Solids, total suspendedmonthly average≤ 3200 lb/dall year701
Solids, total suspendeddaily maximum≤ 8530 lb/dall year701
Oil & Greasemonthly average≤ 10 mg/Lall year701
Oil & Greasedaily maximum≤ 30 mg/Lall year701
Oil & Greasedaily maximum≤ 2140 lb/dall year701
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year701
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year701

New limits from Aug 1, 2028

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Aluminum, total [as Al], daily maximum1.95 mg/Lnew0.48 mg/L (9 values)0.246×
Aluminum, total [as Al], monthly average1.25 mg/Lnew0.291 mg/L (9 values)0.233×

How strict are these limits?

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

Same industry: the 85 Primary Metal Industries permits in Pennsylvania.

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Your permit document is the final word. As JSON: /api/v1/permits/PA0004073 · MCP: https://passage-data.com/mcp