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Unison Industries, LLC - Plant 1

Aircraft Engines And Engine Parts, Dayton, Ohio. NPDES permit OH0112755, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (18 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (30)

ParameterStatisticLimitMonths
pHdaily minimum≥ 6.5 SUall year
pHdaily maximum≤ 9 SUall year
Residue, tot fltrble [dried at 105 C]monthly averagereport only (mg/L)all year
Residue, tot fltrble [dried at 105 C]daily maximumreport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec
Copper, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec
Copper, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Aug, Dec
Tetrachloroethylenedaily maximum≤ 5 ug/Lall year
1,1-Dichloroethanemonthly average≤ 5 ug/Lall year
1,1-Dichloroethanedaily maximum≤ 10 ug/Lall year
1,1-Dichloroethylenemonthly average≤ .6 ug/Lall year
1,1-Dichloroethylenedaily maximum≤ 7 ug/Lall year
1,1,1-Trichloroethanemonthly average≤ 5 ug/Lall year
1,1,1-Trichloroethanedaily maximum≤ 10 ug/Lall year
1,1,2,2-Tetrachloroethanemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec
1,1,2,2-Tetrachloroethanedaily maximumreport only (ug/L)Mar, Jun, Aug, Dec
trans-1,2-Dichloroethylenemonthly average≤ 5 ug/Lall year
trans-1,2-Dichloroethylenedaily maximum≤ 10 ug/Lall year
1,2-Dichloroethenemonthly averagereport only (ug/L)Mar, Jun, Aug, Dec
1,2-Dichloroethenedaily maximumreport only (ug/L)Mar, Jun, Aug, Dec
Trichloroethylenedaily maximum≤ 5 ug/Lall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Toxicity [chronic], Ceriodaphnia dubiamonthly averagereport only (tox chronic)Jun, Dec
Toxicity [chronic], Ceriodaphnia dubiadaily maximumreport only (tox chronic)Jun, Dec
Toxicity [chronic], Pimephales promelas [Fathead Minnow]monthly averagereport only (tox chronic)Jun, Dec
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximumreport only (tox chronic)Jun, Dec

How strict are these limits?

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

Same industry: the 27 Transportation Equipment permits in Ohio.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/OH0112755 · MCP: https://passage-data.com/mcp