Phosphate pollution is caused by:

Explanation

Phosphate pollution is indeed primarily caused by the release of phosphates into the environment from various sources, with sewage and agricultural fertilizers being two significant contributors. Phosphate is an important compound of fertilizers that are added to crop fields and then are passed down to water bodies during rains through run off. It is also present in sewage that is dumped into the water body. This can bring about the dense growth of water plants especially the algae and cause an algal bloom. This algal bloom leads to oxygen depletion in water bodies and causes death of aquatic life.