According to California law, at what blood alcohol concentration level is it illegal for a person younger than 21 to operate a vessel?

In California, individuals under the age of 21 are subject to a zero-tolerance policy regarding alcohol consumption while operating a vessel. This means that it is illegal for them to have any measurable blood alcohol concentration (BAC) while boating. Therefore, a BAC level of 0.01 percent or more is sufficient for a violation under this specific law.

This law is designed to promote safety on the water and to deter underage drinking and boating, recognizing the increased risks associated with both alcohol consumption and inexperience with boating activities. The zero-tolerance stance emphasizes that any detectable blood alcohol level can impair a young person's ability to operate a vessel safely, thus the answer reflects that policy.