Boats are like cars—using and maintaining them can have an impact on the environment. Fuel spills, oil leaks, detergents, and boat sewage discharges all can pollute the water. Boating in sensitive and shallow areas can also harm delicate habitats if not done with care. With minimal effort and expense you can help keep our coastal waters clean and healthy—a key ingredient for great boating. Many websites provide useful tips for minimizing boating impacts, including Clean Boating in the Commonwealth, an article on page 52 of the Massachusetts Office of Coastal Zone Management (CZM) 2007 Coastlines pdf format of    Coastlines 2007  file size 38MB magazine. The following information gives specific steps for handling fuel and oil, sewage and graywater, boat cleaning and maintenance, boating in sensitive areas, and marine debris, along with links to additional information.

Fuel and Oil

While large spills of oil and gasoline are rare, the small drips from regular boating activities can add up. This oil and gasoline degrades marine water quality and is toxic to humans and marine life. These simple steps can help you keep oil and fuel out of the water.

  • Refuel carefully - Always use an oil absorbent cloth or pad when fueling to catch small drips, particularly when you remove the fuel nozzle from the boat's fuel line. Also, do not top off the fuel tank—fuel expands in the heat, causing tanks to leak if too full. The BoatU.S. Foundation's Help Stop the Drops website provides details to ensure drip-free fueling. If you do spill, report it to facility staff. Do not use soap to break up or disperse the spill. It increases harm to the environment and is illegal.
  • Keep a clean bilge - Maintaining your engine will reduce oil and fuel leaks and help prevent oily bilge water from being released overboard. As added protection, place an oil absorbent pad/sock in the bilge to capture oily waste. See CZM's Bilge Sock web page for details.
  • Reduce fuel use - Increasing your fuel efficiency saves you time with fewer trips to the fuel dock, saves money through using less fuel, and saves the environment too. The BoatU.S. Foundation's Fuel Efficiency and Alternative Fuels web page provides tips to get the most out of each fill up—from finding the sweet spot where your boat rides smooth to using the appropriate propeller.

Sewage and Graywater

Boat sewage can contain bacteria and viruses, nutrients, and chemicals—and graywater left over from dishwashing and showering can contain soaps, detergents, and other materials—all of which can be harmful to water quality and public health. These simple practices can help manage sewage and graywater.

  • Use pumpouts - Pumpout facilities provide a convenient way to properly dispose of boat sewage. And much of the Massachusetts coastline is a No Discharge Area (NDA) for boat sewage—making pumpout use mandatory. There are more than 100 pumpout facilities coastwide, and many of them are pumpout boats that can come directly to your boat at your convenience. For current NDA locations and a complete list pumpouts in coastal Massachusetts, see CZM's No Discharge Areas website. Also, use shoreside restrooms when possible to reduce your pumpout needs.
  • Reduce graywater impacts - Do your dishwashing and showering at shoreside facilities to reduce discharges of graywater (non-sewage wastewater). If you must wash on board, use a phosphate-free biodegradable soap. In Massachusetts, Nantucket has taken steps to reduce graywater impacts by prohibiting discharges from dishwashers and washing machines into Nantucket waters. See the Nantucket Boat Basin's rules on graywater.

Boat Cleaning and Maintenance

One of the best ways to keep pollutants out of the water is to save maintenance projects for the boatyard, where it is much easier to collect waste. If work must be done in the water, do all you can to contain and catch drips and debris for proper disposal.

  • Spill-proof oil changes - Use an oil change pump to transfer oil from the engine to a spill-proof container. Wrap the oil filter in plastic bag before removing. Properly dispose of all used oil and oil filters. Ask marina staff for instructions or see the Massachusetts Department of Environmental Protection's Motor Oil & Oil Filters web page.
  • Manage bottom paints better - Minimize the release of pollutants by choosing a hard, less toxic, or nontoxic bottom paint. Remember to use only non-abrasive methods and no underwater cleaning if your boat has soft, ablative paint. The University of California's Sea Grant Extension Program has done a lot of research on bottom paints and developed a Nontoxic Antifouling Strategies web page. You can avoid the need for bottom paint altogether by using a dry storage marina or trailering your vessel.
  • Practice green cleaning - Regularly scrub and wash down your boat with fresh water to reduce need for cleaners and if needed, use greener boat-cleaning products. See CZM's Get Your Home Squeaky Green-Clean for tips on eco-friendly cleaning.

Boating in Sensitive Areas

Boats allow us to explore places not accessible on foot, such as salt marshes and shallow flats, but improper boating practices can cause environmental harm. Boating in shallow waters can do severe damage to eelgrass beds, which are the nursing grounds for many important fish species. Salt marshes, which provide flood control and critical habitat for fish, migratory birds, and other wildlife, are also susceptible to vessel traffic. These low-energy environments are particularly susceptible to erosion from waves created by boat wakes. Chapter 4 of the Massachusetts Clean Marina Guide pdf format of    cmg-4-13.pdf  gives specifics on how to minimize your impacts to sensitive coastal areas. In particular, please remember to:

  • Observe "no wake" zones - Lower speeds are required for a reason—for safety and to protect sensitive shorelines.
  • Avoid boating in shallow waters - If you can't avoid eelgrass beds, then reduce speeds! Also, do not anchor in eelgrass beds.

Marine Debris

Trash and discarded materials, known as marine debris, can have a large impact on boating and marine life. Plastic bags can clog engine intakes, causing overheating and expensive repairs. Fishing line can get wrapped around a propeller, disabling the boat. Marine life can mistake debris for food, and fishing line, six pack holders, and other garbage can entangle animals. Use the following tips to help reduce marine debris:

  • Stow that trash - Keep your trash on board. Never throw cigarette butts, fishing line, or any other garbage into the ocean. Take advantage of shoreside recycling containers. The BoatU.S. Foundation's Stash Your Trash web page provides more information.
  • Recycle fishing line - Join the BoatU.S. Foundation's Reel In and Recycle program to install and maintain monofilament recycling stations at a fishing spot near you.
  • Join a cleanup - Organize a COASTSWEEP cleanup at your marina or local beach and be part of this state-wide event to remove marine debris from our shores.

Additional Information

Here are a few additional resources to explore.