GREAT LAKES MUD
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NAPL

Non-aqueous phase liquid
Dioxins
Heavy Metals
NAPL
PAHs
Oil & Grease
PCBs
TBT
TPH

Non-Aqueous Phase Liquids (NAPL)


Toxic. Liquid. Migratory.
NAPL is not a type of pollutant. The term instead refers to the physical and chemical properties of a pollutant. For example, PCBs, chlorinated solvents, mercury, and coal tar can occur as NAPL when released into the environment in liquid form. The liquid nature of NAPL means it can easily move through the water. NAPL can appear oily, float on the surface, or sink to the bottom. It is created when producing common goods like dry cleaning fluid, gasoline, and fuel oils.

NAPL poses a serious risk to public health, in large part because its liquid nature makes it possible for NAPL to flow into drinking water supplies. 

For more information

U. S. Environmental Protection Agency
IISG and GLR logos
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Contact Us

Great Lakes Mud c/o Illinois-Indiana Sea Grant
Purdue University
195 Marsteller Street
West Lafayette, IN 47907-2033

​Email: abelle@illinois.edu
© 2019 Illinois-Indiana Sea Grant, All Rights Reserved.
Illinois-Indiana Sea Grant strives to ensure equal access and an
​inclusive environment.
Website last updated December 14, 2022
  • Home
  • Pollution
    • Dioxins
    • Heavy Metals
    • NAPL
    • Oil and Grease
    • PAHs
    • PCBs
    • TBT
    • TPH
  • Partnership
    • Great Lakes Legacy Act
    • Cost-Sharing
  • Cleanup Process
    • Project Stages
    • Dredging
    • Dry Excavation
    • Caps and Covers
    • Habitat Restoration
  • Waterbody
    • Indiana >
      • East Branch - Grand Calumet River AOC
      • East Branch Phase II - Grand Calumet River AOC
      • East Chicago Waterways - Grand Calumet River AOC
      • Indiana Harbor Canal TSCA - Grand Calumet River AOC
      • Lake George Canal Middle & East - Grand Calumet River AOC
      • Roxana Marsh - Grand Calumet River AOC
      • Stateline - Grand Calumet River AOC
      • West Branch - Grand Calumet River AOC
    • Michigan >
      • Black Lagoon - Detroit River AOC
      • Centennial Park - Detroit River AOC
      • Division Street Outfall - Muskegon Lake AOC
      • Former MGP Site - St. Marys River AOC
      • Lower Rouge River Old Channel - Rouge River AOC
      • River Raisin - River Raisin AOC
      • Riverwalk - Detroit River AOC
      • Ruddiman Creek - Muskegon Lake AOC
      • Ryerson Creek Outfall - Muskegon Lake AOC
      • Tannery Bay - St. Marys River AOC
      • Torch Lake - Torch Lake AOC
      • Upper Trenton Channel - Detroit River AOC
      • Zephyr Site - Muskegon Lake AOC
    • Minnesota >
      • Azcon/DSPA Slip - St. Louis River AOC
      • Minnesota Slip - St. Louis River AOC
      • Munger Landing - St. Louis River AOC
      • Scanlon Reservoir - St. Louis River AOC
      • Slip 3 and Slip C - St. Louis River AOC
      • SLR Interlake/Duluth Tar - St. Louis River AOC
      • Spirit Lake Site - St. Louis River AOC
    • New York >
      • Buffalo River - Buffalo River AOC
    • Ohio >
      • Ashtabula River - Ashtabula River AOC
      • Cuyahoga River Old Channel - Cuyahoga River AOC
      • Gorge Dam - Cuyahoga River AOC
      • Jack's Marine North Slip - Ashtabula River AOC
      • Ottawa River - Maumee AOC
      • Otter Creek - Maumee AOC
    • Wisconsin >
      • Greater Milwaukee Estuary - Milwaukee Estuary AOC
      • Hog Island Inlet - St. Louis River AOC
      • Howards Bay - St. Louis River AOC
      • Kinnickinnic River - Milwaukee Estuary AOC
      • Lincoln Park - Milwaukee Estuary AOC
      • Sheboygan River - Sheboygan River AOC
      • Tyco - Menominee River AOC
    • More coming soon...
  • Education
    • Grade School Curriculum
    • High School Curriculum
    • More Resources >
      • Indiana
      • Michigan
      • Minnesota
      • Ohio
      • Wisconsin
  • Contact