Most states appear to be .08 or greater, however knowing what state you live in would help give a more accurate answer.
Legislation varies depending on the country concerned
In Missouri, a blood alcohol concentration (BAC) of 0.08% or higher is considered boating while intoxicated (BWI). This legal limit applies to individuals operating a motorized vessel. If a person's BAC is above this threshold, they may face legal penalties, including fines and possible imprisonment. Additionally, lower BAC levels can still result in BWI charges if the operator is deemed impaired.
Boating while intoxicated is dangerous and is also illegal in most places.
0.08%
Blood Alcohol Content BAC 0.10.
.08
0.08%
0.08%
0.08%
.08%
.08%
The effects on the human body are the same in boh environments.