We identified immersion injuries of New Jersey residents from mortality and hospital discharge data. The incidence rate was 2.3 immersion injuries (1.3 fatal and 1.0 nonfatal) per 100,000 population per year. Incidence rates were elevated among young children, men, blacks, and residents of counties in the southern part of the state. Case fatality ratios increased with age and were higher for men than for women from 10 to 50 years of age.