PFD / life jacket
A U.S. Coast Guard-approved personal flotation device that wakesurfers must wear; inflatable PFDs are not allowed for towed watersports.
Recreation
PFD / life jacket is a term from limnology — the scientific study of inland waters. The detailed explanation below covers the definition, why the concept matters to lake water-quality interpretation, and how it relates to the A–F grade. Reading PFD / life jacket alongside the A–F grade makes the grade easier to follow — each graded parameter maps onto an established limnological concept.
The per-lake pages on LakeQuality always show the specific PFD / life jacket value for that lake, so you can move from the general concept to the specific lake without leaving the site.
What It Means for Your Lake
A personal flotation device (PFD), or life jacket, is required safety gear for wakesurfing. The standard is a U.S. Coast Guard-approved, non-inflatable wearable PFD, commonly a Type III, worn at all times while riding regardless of skill level. Inflatable PFDs are specifically prohibited for water skiing and other aquaplaning activities because they can fail on impact or fail to deploy. In addition to the rider's worn PFD, a USCG-approved flotation device must be accessible aboard for every person on the boat. The PFD is especially important in wakesurfing given the carbon-monoxide and drowning risks of being in the water close behind the boat.
Frequently Asked Questions
What is pfd / life jacket?
A U.S. Coast Guard-approved personal flotation device that wakesurfers must wear; inflatable PFDs are not allowed for towed watersports.
Why does pfd / life jacket matter for lake health?
A personal flotation device (PFD), or life jacket, is required safety gear for wakesurfing. The standard is a U.S. Coast Guard-approved, non-inflatable wearable PFD, commonly a Type III, worn at all times while riding regardless of skill level. Inflatable PFDs are specifically prohibited for water s...
Related Terms
A dedicated second person besides the driver whose only job is to watch the rider and relay their status, legally required in most jurisdictions for towed watersports.
State and local regulations requiring a qualified observer (spotter) aboard, in addition to the driver, whenever a rider is being towed.
The odorless, colorless gas in boat exhaust that accumulates behind the transom and poses a serious poisoning and drowning risk to riders close to the boat.
The area of water immediately behind the boat near the propeller where a fallen rider is at greatest risk, prompting an immediate engine shutdown.
Source: EPA National Aquatic Resource Surveys, 2026.