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RTX Corporation

Aircraft Engines And Engine Parts, North Berwick, Maine. NPDES permit ME0022861, in force until Jul 31, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (46 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 (50)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitdaily maximum≤ 82 deg FJun–Sep
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/Lall year
Solids, total suspendeddaily maximum≤ 15 mg/Lall year
Solids, total suspendedmonthly average≤ 6.3 lb/dall year
Solids, total suspendeddaily maximum≤ 6.3 lb/dall year
Oil & Greasemonthly average≤ 15 mg/Lall year
Oil & Greasedaily maximum≤ 15 mg/Lall year
Oil & Greasemonthly average≤ 6.3 lb/dall year
Oil & Greasedaily maximum≤ 6.3 lb/dall year
Phosphorus, total [as P]monthly average≤ .034 lb/dJun–Sep
Phosphorus, total [as P]daily maximum≤ .1 lb/dJun–Sep
Cyanide, total [as CN]monthly average≤ 201 ug/Lall year
Cyanide, total [as CN]daily maximum≤ 726 ug/Lall year
Cyanide, total [as CN]monthly average≤ .06 lb/dall year
Cyanide, total [as CN]daily maximum≤ .2 lb/dall year
Cadmium, total [as Cd]monthly average≤ 3.1 ug/Lall year
Cadmium, total [as Cd]daily maximum≤ 13.9 ug/Lall year
Cadmium, total [as Cd]monthly average≤ .00086 lb/dall year
Cadmium, total [as Cd]daily maximum≤ .0036 lb/dall year
Copper, total [as Cu]monthly average≤ 91 ug/Lall year
Copper, total [as Cu]daily maximum≤ 101 ug/Lall year
Copper, total [as Cu]monthly average≤ .025 lb/dall year
Copper, total [as Cu]daily maximum≤ .028 lb/dall year
Lead, total [as Pb]monthly average≤ 16 ug/Lall year
Lead, total [as Pb]daily maximum≤ 87 ug/Lall year
Lead, total [as Pb]monthly average≤ .004 lb/dall year
Lead, total [as Pb]daily maximum≤ .1 lb/dall year
Nickel, total [as Ni]monthly average≤ 480 ug/Lall year
Nickel, total [as Ni]daily maximum≤ 1000 ug/Lall year
Nickel, total [as Ni]monthly average≤ .14 lb/dall year
Nickel, total [as Ni]daily maximum≤ 1.1 lb/dall year
Zinc, total [as Zn]monthly average≤ 250 ug/Lall year
Zinc, total [as Zn]daily maximum≤ 250 ug/Lall year
Zinc, total [as Zn]monthly average≤ .33 lb/dall year
Zinc, total [as Zn]daily maximum≤ .28 lb/dall year
Priority Pollutantsvaluereport only (ug/L)all year
Flow, in conduit or thru treatment plantdaily maximum≤ 50000 gal/dall year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Analytical Chemistryvaluereport only (N=0;Y=1)all year
Mercury, total [as Hg]monthly average≤ 4.5 ng/Lall year
Mercury, total [as Hg]daily maximum≤ 6.8 ng/Lall year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year
NOEL Static Renewal 7Day Chronic Ceriodaphnia dubiadaily minimumreport only (%)all year
Noel Statre 10Day Chronic Salvel. Salmonidvaluereport only (%)all year
NOAEL Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)all year
NOAEL Static 48Hr Acute Ceriodaphnia dubiadaily minimumreport only (%)all year
NOAEL Static 48Hr Acute Salvel. Salmoniddaily minimumreport only (%)all year
NOAEL Static 48Hr Acute Salvel. Salmoniddaily minimumreport only (%)all year

How strict are these limits?

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

Same industry: the 4 Transportation Equipment permits in Maine.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ME0022861 · MCP: https://passage-data.com/mcp