Distinguish between point and non-point sources of water pollution.

A point source would be an industry or specific agent with an identifiable waste stream.

Nonpoint source of water pollution is an unconfined contamination of water from the land into a body of water. eg- Runoffs from city streets, agricultural fields.

Pollution from point sources is easily identified. Non-point sources are less easily identified and can include unknown releases.

It is easier to limit the pollution that point sources may discharge but difficult to restrain the pollution by non-point sources.