This document discusses pollution in New Zealand's waterways. It identifies the Manawatu River as the most polluted waterway and notes that the most common types of pollution are rubbish, chemicals, and sewage. These types of pollution are negatively impacting water life and humans, with over 4,500 cases of Giardia reported. The document suggests various actions individuals and groups like farmers can take to help reduce water pollution, such as properly disposing of household waste and chemicals.