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Armstrong World Industries, Inc.

Mineral Wool, Millwood, West Virginia. NPDES permit WV0116661, in force until Feb 27, 2028. Last 12 months: over a limit 9 times (last August 2026), 1 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: outfall 001 form A monthly (18 values), outfall 001 form B quarterly (8 values), outfall 001 form C twice a year (4 values), outfall 002 form C twice a year (14 values)
Renewal application due
Aug 31, 2027 · 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, 18 required values missing, 3 of 20 reports late

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

Period endingParameterReportedLimitOver by
December 2025Zinc, total recoverable, monthly average.051 mg/L≤ .045 mg/L13%
January 2026Zinc, total recoverable, monthly average.051 mg/L≤ .045 mg/L13%
April 2026Zinc, total recoverable, daily maximum.18 mg/L≤ .13 mg/L38%
April 2026Zinc, total recoverable, monthly average.149 mg/L≤ .045 mg/L231%
May 2026Zinc, total recoverable, daily maximum.197 mg/L≤ .13 mg/L52%
May 2026Zinc, total recoverable, monthly average.157 mg/L≤ .045 mg/L249%
July 2026Zinc, total recoverable, daily maximum.24 mg/L≤ .13 mg/L85%
July 2026Zinc, total recoverable, monthly average.155 mg/L≤ .045 mg/L244%
August 2026Zinc, total recoverable, monthly average.091 mg/L≤ .045 mg/L102%

Limits in force (66)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)May001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Aug001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jul001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Oct001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Feb001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Apr001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jun001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Dec001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Sep001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Mar001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jan001
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Nov001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)May001
Temperature, water deg. fahrenheitdaily maximum≤ 120.8 deg FAug001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jul001
Temperature, water deg. fahrenheitdaily maximum≤ 116.2 deg FOct001
Temperature, water deg. fahrenheitdaily maximum≤ 67.2 deg FFeb001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Apr001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jun001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Dec001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Sep001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Mar001
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jan001
Temperature, water deg. fahrenheitdaily maximum≤ 120.5 deg FNov001
pHinstantaneous minimum≥ 6 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Nitrogen, nitrite total [as N]monthly average≤ .86 mg/Lall year001
Nitrogen, nitrite total [as N]daily maximum≤ 3 mg/Lall year001
Nitrogen, nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year001
Chloride [as Cl]monthly average≤ 1230 mg/Lall year001
Chloride [as Cl]daily maximum≤ 2533 mg/Lall year001
Fluoride, total [as F]monthly averagereport only (mg/L)all year001
Fluoride, total [as F]daily maximumreport only (mg/L)all year001
Iron, total recoverablemonthly average≤ .83 mg/Lall year001
Iron, total recoverabledaily maximum≤ 2.58 mg/Lall year001
Zinc, total recoverablemonthly average≤ .045 mg/Lall year001
Zinc, total recoverabledaily maximum≤ .13 mg/Lall year001
Aluminum, total recoverablemonthly average≤ .4 mg/Lall year001
Aluminum, total recoverabledaily maximum≤ 1.1 mg/Lall year001
Copper, total recoverablemonthly averagereport only (mg/L)all year001
Copper, total recoverabledaily 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≤ .028 mg/Lall year001
Chlorine, total residualdaily maximum≤ .057 mg/Lall year001
Toxicity [acute], Ceriodaphnia dubiamonthly averagereport only (tox acute)all year001
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (tox acute)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox acute)all year001
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox acute)all year001
Sulfatemonthly averagereport only (mg/L)all year001
Sulfatedaily maximumreport only (mg/L)all year001
pHinstantaneous minimumreport only (SU)all year002
pHinstantaneous maximumreport only (SU)all year002
Solids, total suspendedmonthly averagereport only (mg/L)all year002
Solids, total suspendeddaily maximumreport only (mg/L)all year002
Magnesium, total [as Mg]monthly averagereport only (mg/L)all year002
Magnesium, total [as Mg]daily maximumreport only (mg/L)all year002
Iron, total recoverablemonthly averagereport only (mg/L)all year002
Iron, total recoverabledaily maximumreport only (mg/L)all year002
Aluminum, total recoverablemonthly averagereport only (mg/L)all year002
Aluminum, total recoverabledaily maximumreport only (mg/L)all year002
Manganese, total recoverablemonthly averagereport only (mg/L)all year002
Manganese, total recoverabledaily maximumreport only (mg/L)all 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

How strict are these limits?

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

Same industry: the 16 Stone, Clay, Glass and Concrete Products permits in West Virginia.

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Your permit document is the final word. As JSON: /api/v1/permits/WV0116661 · MCP: https://passage-data.com/mcp