Do You Need a Boating License in Maine? Rules and Exemptions

Maine does not issue a boating license in the traditional sense. Instead, the state requires a one-time boating safety certificate for certain operators. If you were born on or after January 1, 1999, you must complete an approved safety course before running a motorboat capable of more than 25 horsepower on Maine’s inland or coastal waters for recreation. Anyone born before that date can operate a standard motorboat without any certificate at all. Registration of the boat itself is a separate requirement and applies to almost every motorized vessel.¹

Who Needs a Boating Safety Certificate

The rule is tied to your birth date, not to any renewal cycle. Operators born on or after January 1, 1999 need the certificate to run a motorboat producing more than 25 horsepower for recreational purposes on Maine’s inland waters or territorial waters (out to three nautical miles). You also have to be at least 12 years old. Everyone born before January 1, 1999 is grandfathered out of the requirement for standard motorboats.¹

Carry the certificate while you operate and show it to law enforcement on request. Not having it is a civil violation with a fine of $100 to $500. Three or more civil violations within five years pushes the offense up to a Class E crime.¹

Kids and Young Operators

Children under 12 cannot operate a motorboat with more than 10 horsepower unless someone at least 16 years old is physically in the boat supervising. As of January 1, 2024, that supervising adult must also have completed a boater safety course if they were born on or after January 1, 1999.¹

Personal Watercraft (Jet Skis)

PWCs are treated more strictly. Nobody under 16 may operate one, and supervision doesn’t change that. If you are 16 or older and were born on or after January 1, 1999, you need the safety certificate before operating a jet ski. Older operators are not required to hold one.²

Exemptions From the Course Requirement

A short list of situations lets you operate without completing the safety course:

You hold a valid Maine Guide license and meet the requirements for carrying passengers for hire.
You hold a U.S. merchant marine document issued by the Coast Guard for an operator of an uninspected passenger vessel, or a master or mate captain’s license (even if expired).
You are test-driving a dealer’s boat that is registered and offered for sale, under the direct supervision of someone 16 or older who has completed a boater safety course.
You are named as an authorized operator on a rental or lease agreement and have completed a temporary safety course provided by the rental agent. This covers you for up to 14 days or the length of the rental, whichever ends first.
You are a non-U.S. citizen who arrived by sea and are operating temporarily on territorial waters for 60 days or less.

The list is narrow. Commercial fishing, for example, does not appear as a blanket exemption from the safety certificate.¹

How to Get the Certificate

The certificate is one-time and valid for life. Maine accepts any course meeting the standards of the National Association of State Boating Law Administrators (NASBLA), so a Maine certificate is honored across all 50 states and U.S. territories, and a NASBLA-approved card from another state is honored in Maine. Canadian Pleasure Craft Operator Cards that meet Transport Canada’s requirements are also accepted.

You have two ways to complete the course:

Online courses from NASBLA-approved vendors, typically free to about $35, self-paced, with a final exam you take from home.
Classroom courses coordinated by the Maine Department of Inland Fisheries and Wildlife (MDIFW) and taught by volunteers, the U.S. Coast Guard Auxiliary, or U.S. Power Squadrons. These are often free and run on a seasonal schedule.

Both formats cover safe operation, navigation rules, equipment requirements, and Maine-specific boating laws. Pass the final exam and you receive your certificate.

Registering Your Boat

Even if you don’t need a personal certificate, your boat almost certainly needs to be registered. The owner of any motorboat whose state of principal use is Maine must obtain a certificate of number from MDIFW, and no certificate issues until the watercraft excise tax has been paid or the boat is shown to be exempt.³

You can register at MDIFW offices, municipal tax collectors, town clerks, or online for renewals. Fees depend on horsepower and whether you’ll be on inland or tidal waters:⁴

0–10 horsepower: $41 inland / $16 tidal
11–50 horsepower: $46 inland / $21 tidal
51–115 horsepower: $52 inland / $27 tidal
116+ horsepower: $60 inland / $35 tidal
Personal watercraft: $60 inland / $35 tidal

Those figures include a $1 agent fee. For Maine-registered boats, the Lake and River Protection sticker is bundled into registration.

Displaying the Number and Stickers

Once registered, display the assigned identification number on each side of the bow. Numbers are vertical block characters at least three inches tall, painted or permanently attached in a contrasting color. The number reads left to right in three parts (the “ME” prefix, the numerals, then the letter suffix), separated by hyphens or spaces. The validation sticker goes about three inches behind the last letter of the number on both sides.³

All motorized watercraft on Maine’s inland waters must also display a Lake and River Protection sticker (the “Preserve Maine Waters” sticker), issued annually, affixed to each side of the bow above the waterline about three inches behind the validation sticker.⁵

Visiting Boaters From Out of State

A motorboat covered by a valid certificate of number from another state does not need Maine registration, as long as the out-of-state number is displayed and the vessel has not been in Maine for more than 60 consecutive days after its state of principal use changed.³

One rule catches visitors off guard: every motorized watercraft on Maine’s inland waters must display a Lake and River Protection sticker, even if the boat is registered somewhere else. For non-Maine-registered boats, the sticker costs $59.⁵

If your boat is in Maine for more than 75 days during the year, it stops being exempt from the state’s watercraft excise tax. At that point you must pay the excise tax to the Maine municipality where the boat is primarily located before registering it.⁶

Boating Under the Influence

Maine’s BUI law tracks its road-DUI standard. The blood alcohol threshold is 0.08% for operators 21 and older and effectively zero (more than 0.00%) for anyone under 21. A BUI is a Class D crime. A first offense carries a minimum $400 fine, with a mandatory 48 hours of unsuspendable jail time if your BAC was 0.15% or higher, you refused a chemical test, or you failed to stop for an officer. Penalties escalate on repeat offenses within a six-year window, and refusing a chemical test raises the minimum fine at every level.⁷

1
Maine State Legislature. Maine Code Title 12 13068-A – Operating Watercraft Prohibitions
2
Maine Department of Inland Fisheries & Wildlife. Maine Boating Laws and Responsibilities
3
Maine State Legislature. Maine Code Title 12 13056 – Certificate of Number, Identification Numbers and Validation Stickers
4
Department of Inland Fisheries & Wildlife. Fishing and Boating – Maine Dept of Inland Fisheries and Wildlife
5
Department of Inland Fisheries & Wildlife. Lake and River Protection – Preserve Maine Waters Stickers
6
Maine State Legislature. Maine Code Title 36 1504 – Excise Tax
7
Maine State Legislature. Maine Code Title 12 10701 – Hunting Under the Influence Operating Watercraft Under the Influence