Water is hazardous for young children.
The best way to protect your child from accidental drowning is to remove even the smallest source of water from his play area, and if water is present, don't take your eyes off him for a minute. Make sure the water is warm enough, preferably between 84 and 87 degrees. Pool water should be properly chlorinated, and natural bodies of water should be unpolluted and safe for wading. If you have a plastic wading pool, drain it and store it in an upright position after each use. If you have a permanent pool, make sure it's enclosed with a fence that is at least 4 feet high, and lock the gate leading to the pool after each use.