Depending on where you live, it may be dangerous to swim in a reservoir. It may even be illegal in your area. That said, some reservoirs have areas that are specially designed for swimmers. It really does vary from reservoir to reservoir.
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Look for signs of poor water quality, such as algal blooms and dirty or turbid water. Do not swim in water that smells like rotten eggs or sewage. Avoid swimming near pipes that drain into lakes or streams.
Lastly, many lakes across the world contain high levels of toxins or bacteria, which can be harmful to those who decide to take a dip. Many lakes in America are perfectly safe for swimmers, but these ones can be particularly hazardous and might warrant a second thought before plunging beneath the surface.
If there is scum or algae visible in the water, it won't be clean enough to swim in. There are also natural hazards to outdoor waters compared with pools, especially in the summer. Blue-green algae is a type of bacteria naturally found in lake ecosystems.
Stay out of the water ifCloudy water can be a warning that there are more germs in the water than normal. Discolored or smelly water could mean there is a harmful algal bloom (HAB) in the water.
“No swimming” signs: This one should go without saying. If there are “no swimming” signs posted near the waterway, don't enter it! Chances are, there are concealed hazards underwater that you may not notice from up above. If you see a sign posted, don't risk it—it's better to find somewhere more desirable to swim.
Lake Drownings are Especially CommonIt is easier to drown in freshwater than in saltwater. Lake waters are dark and murky – it harder to spot someone who is drowning. Ice on lakes can be thinner than expected, causing someone to fall through and drown.
With less population, the Linapacan Island in Philippines offers the most serene and clear beaches. The water here is the purest of all. So all you divers out there can enjoy a swim in immaculate water here.
Pools also tend to be much cleaner than natural lakes. This is because most pool owners take extra care to make sure the pool is sanitized, oxidized, and pH balanced on a regular basis. You're far less likely to pick up an infection from swimming in the local pool.