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In the ordinary case a lifeguard has no police powers. They are safety staff employed by a facility, and their authority comes from the facility rules rather than from law: they can instruct people to stop unsafe behavior, refuse entry to the water, clear the pool, and ask someone to leave the premises. Those are the powers of any employee enforcing the conditions of entry, and they end at the property line.
What a lifeguard can always do is summon someone who does have authority. Facilities that operate well have a clear escalation path, a supervisor, in-house security, then police, and the guard's job is to keep the water safe while that happens, not to resolve a confrontation personally. Leaving the chair to deal with a dispute is how a supervision gap opens, which is the actual risk in most of these situations.
There is a narrow exception worth knowing about, which is why the question comes up at all. In some jurisdictions certain beach patrol or municipal aquatic personnel are sworn officers or hold limited peace-officer status as part of a wider public safety role, and that status comes from their employer and local law rather than from lifeguard certification. If you need a definitive answer for a particular role or location, ask that employer directly, this is a question for them, not something a certification course confers.
Reviewed by Jackie Stern, Lifeguard Instructor, Firefighter and EMT. Jackie Stern has taught lifeguarding for more than 20 years and works as a firefighter, EMT and swim instructor. She reviews course content, prerequisites and rescue standards against current certification requirements.