Missouri Boating Laws: Registration, Equipment, and BUI

Missouri boating laws require every motorized vessel on state waters to be registered with the Department of Revenue, and anyone born after January 1, 1984, must carry a boater safety identification card when operating on a lake. The Missouri State Highway Patrol’s Water Patrol Division enforces these rules and can board any vessel with probable cause to check for compliance.¹ The rest comes down to equipment on board, how you operate, and what you do if something goes wrong.

Registering Your Vessel

Missouri defines a “vessel” as any motorized watercraft and any sailboat longer than twelve feet, with or without a motor. Canoes, kayaks, and other craft powered only by paddles or oars are not vessels under the law and need no title or registration.² Everything else must be titled and registered through the Department of Revenue, which issues a certificate of title and a certificate of number.³ Registration runs for three years before renewal.⁴

Keep the certificate of number on the vessel and available for inspection whenever you’re underway. The assigned numbers go on each side of the bow in block characters at least three inches high, in a color that contrasts sharply with the hull so they read clearly from a distance.⁵ If you can’t produce the certificate during a stop, you’re exposed to Chapter 306’s general penalty, a Class B misdemeanor with a fine of up to $1,000.⁶

Boats Visiting From Other States

If you live outside Missouri, you can run your boat here for up to 60 consecutive days without registering it in-state. Keep it longer and you have to title and register with the Department of Revenue and pay the applicable sales tax. Missouri credits tax paid elsewhere, and no additional tax is due if the vessel was registered and operated in the other state for at least 90 days before you brought it over.⁴

Boater Education Cards and Minimum Age

Anyone born after January 1, 1984, who operates a vessel on a Missouri lake must carry a boater safety identification card issued by the Water Patrol Division. You qualify for the card by completing a boating safety course approved by the National Association of State Boating Law Administrators, passing an equivalency exam given by the Water Patrol, or holding a valid U.S. Coast Guard master’s, mate’s, or operator’s license.⁷

The education requirement applies only on lakes. On the Missouri River or Mississippi River, you can legally operate without the card, although the same safe-operation rules still apply. Several categories are exempt entirely: active-duty military and their spouses, nonresidents holding a valid NASBLA-approved certificate from their home state, and participants in approved regattas or events.⁷

You must be at least 14 to operate a motorboat or personal watercraft on your own. Younger kids can take the helm only under the direct, on-board supervision of a parent, guardian, or someone at least 16. A child under 14 operating on a lake still needs a boater education card even with a supervisor present.⁸

Safety Equipment You Must Carry

Officers check for required gear during routine stops, and operating without it is a Class B misdemeanor.

Life Jackets

Every boat needs at least one U.S. Coast Guard-approved personal flotation device for each person on board and each person being towed who isn’t already wearing one. Vessels under sixteen feet (Class A) can meet the requirement with Type I, II, III, or IV PFDs. Boats sixteen feet and longer must carry a wearable Type I, II, or III PFD for every person plus at least one Type IV throwable device such as a ring buoy or cushion.⁹ Children under seven must actually wear a properly fitted PFD at all times while the vessel is underway, unless they’re inside a fully enclosed cabin.

Fire Extinguishers

Motorboats that carry or use gasoline or other flammable fluids must have Coast Guard-approved marine fire extinguishers on board. Count depends on size:

Under 26 feet (Class A and Class 1): one B1-type extinguisher.
26 to 40 feet (Class 2): two B1-type, or one B2-type, or a fixed system plus one B1.
40 to 65 feet (Class 3): three B1-type, or one B2 plus one B1, or a fixed system with additional portable units.

Disposable extinguishers expire twelve years from the manufacture date stamped on the bottle and must be replaced.⁹¹⁰

Ventilation, Lights, and Sound

Any vessel with an enclosed engine compartment or any space that could trap flammable fumes needs a ventilation system capable of clearing those gases before and during operation. Between sunset and sunrise, all vessels underway must display navigation lights. Smaller boats typically carry a white all-around light plus a combined bow light showing green to starboard and red to port.⁹ You also need some means of making an effective sound signal; federal rules require a whistle on vessels about 39 feet or longer and a whistle plus a bell on vessels 20 meters or longer.¹¹

Speed, Wake, and Careless Operation

On lakes, Missouri enforces a slow-no-wake limit within 100 feet of any dock, pier, occupied anchored boat, or buoyed restricted area. Violating it is an infraction and one of the most common citations the Water Patrol writes.¹² Weaving through congested traffic, jumping another boat’s wake at close range, and crowding other vessels all fall under negligent or careless operation. Officers have broad discretion, and a careless-operation citation usually means a mandatory court appearance.

Boating Under the Influence

Operating a vessel while intoxicated is a criminal offense. A first conviction is a Class B misdemeanor, punishable by up to six months in jail and a fine of up to $1,000. A second conviction is a Class A misdemeanor, and a third or later offense is a Class D felony.¹³⁶ A separate statute makes operating with a blood alcohol concentration of 0.08 percent or higher its own offense, so a single stop can produce charges under both statutes.¹⁴ A boating conviction does not affect your driver’s license, but the criminal record, fines, and jail exposure are real, and penalties escalate quickly with repeat offenses.

Towing Skiers and Tubers

When towing someone on skis, a wakeboard, a tube, or any similar device, you need a way to watch the person at all times. That means either a second person on board acting as a dedicated observer, or a ski mirror at least three inches tall and eight inches wide giving a full 180-degree view behind the boat. The factory mirrors on most personal watercraft do not meet that standard.

On the Mississippi River, the Missouri River, and Missouri lakes between 11:00 a.m. and sunset, the tow boat must fly a red or orange flag whenever a towed person is in the water before or after skiing. Parasailing requires a dedicated observer at least 12 years old on board in addition to the operator, regardless of mirror setup.

Noise and Muffler Rules

Missouri caps exhaust noise at 90 decibels for motorboats manufactured after January 1, 1996, and 86 decibels for older boats. Removing, modifying, or bypassing a muffler to exceed the limit is illegal, as is installing any switch that lets you toggle the exhaust louder than allowed. Fines start at $100 for a first offense, $200 for a second, and $300 for a third. After a citation you have 60 days to bring the boat into compliance and have it retested by the Water Patrol. Failing to comply or refusing a testing request bumps the charge to a Class C misdemeanor.¹⁵

What to Do After an Accident

If you’re in a collision or other boating accident, state law requires you to stop, help anyone in danger to the extent you safely can, and give your name, address, and vessel identification in writing to anyone injured and to the owner of any damaged property. When the accident results in death, injury, or property damage over $500, you must also file a formal report with the Water Patrol Division describing what happened.¹⁶ Failing to report is its own violation, and the report often becomes key evidence in any insurance claim or lawsuit that follows.

1
Missouri Revisor of Statutes. Missouri Code 306.165 – Water Patrol Officer, Powers, Duties and Jurisdiction Of
2
Missouri Revisor of Statutes. Missouri Code 306.010 – Definitions
3
Missouri Revisor of Statutes. Missouri Code 306.015 – Vessels, Registration, Procedure, Fee
4
Missouri Department of Revenue. Boat/Vessel/Outboard Motor Titling and Registration
5
Cornell Law Institute. 11 CSR 50-7.010 – Display of Identification Numbers
6
Missouri Revisor of Statutes. Missouri Code 558.002 – Authorized Fines for Offenses
7
Missouri Revisor of Statutes. Missouri Code 306.127 – Boating Safety Identification Card Required, When
8
Missouri State Highway Patrol. Boater Education Law FAQ
9
Missouri Revisor of Statutes. Missouri Code 306.100 – Classification of Vessels, Equipment Requirements
10
United States Coast Guard. Fire Extinguishers Requirements for the Recreational Boater FAQ
11
eCFR. 33 CFR 83.33 – Equipment for Sound Signals (Rule 33)
12
Missouri Revisor of Statutes. Missouri Code 306.125 – Operation of Watercraft, How, Restricted Areas
13
Missouri Revisor of Statutes. Missouri Code 306.111 – Negligent Operation of a Vessel, Penalty, Operating a Vessel While Intoxicated
14
Missouri Revisor of Statutes. Missouri Code 306.112 – Operating a Vessel With Excessive Blood Alcohol Content
15
Missouri Revisor of Statutes. Missouri Code 306.147 – Muffler Required, Noise Level Regulations
16
Missouri Revisor of Statutes. Missouri Code 306.140 – Accident or Collision, Duties of Operator