Yes—downed power lines or submerged outlets from adjacent homes could energize the water. Use extreme caution when entering any flooded area.
Ocean water and salt spray can be particularly damaging to electrical equipment due to the corrosive and conductive nature of the saltwater residue. Damage to electrical equipment can also result from exposure to flood waters contaminated with chemicals, sewage, oil, and other debris.
No matter what caused the flood, electrical appliances should be examined by a qualified service repair dealer before being re-energized, and electrical items that were submerged should be discarded and replaced by a licensed, qualified professional.
Electrical items, such as circuit breakers, fuses, ground fault circuit interrupters (GFCIs), receptacles, plugs, and switches, can malfunction when water and silt get inside. Discard them if they have been submerged. Have a licensed, qualified professional replace them.
Do not use electrical appliances that have been wet until they have been examined by a qualified service repair dealer. Electrical equipment exposed to water can be extremely dangerous if re-energized without proper reconditioning or replacement.
Use extreme care when stepping into flooded areas. Submerged outlets or electrical cords can energize water, posing a lethal trap.