It happened on North Delaware and Linden avenues in Philadelphia's Torresdale neighborhood at approximately 5:30 p.m.
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The fire department was called to the scene at the Linden Avenue Boat Ramp for reports a woman fell off a Jet Ski and swam to a "Jersey island."
She was rescued from the water just before 6:30 p.m., according to police.
The 51-year-old was transported to Jefferson Torresdale Hospital after being rescued. Officials say she is in critical condition.
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There is no word yet on what caused the woman to fall off or lose control of the Jet Ski.