These definitions and explanations should provide a comprehensive understanding of key terms related to freshwater management in New Zealand. Keep in mind that the management practices, regulations, and terminology can evolve over time.
| Waterbody | A river, lake, stream, pond, wetland, or groundwater |
| Water holding capacity | The storage capacity (or ability) of a soil to hold water. |
| Water take(s) | The act of abstracting water from a natural source. Managing water takes is essential for preventing over-extraction and maintaining ecosystem health. |
| Whakapapa | The Māori concept of genealogy and interconnectedness. It emphasizes the relationships between people, land, and water. |
| Whānau | The Māori term for family. Whānau often have cultural connections to specific water bodies and play a role in freshwater management. |
| Wāhi tapu | A Māori term referring to a sacred or culturally significant site. Protecting wāhi tapu is an important aspect of freshwater management. |
| Wastewater | Water containing contaminants that result from human activities, such as domestic or industrial processes. Proper wastewater treatment is necessary to prevent water pollution. |
| Water quality | The physical, chemical, and biological characteristics of water. Monitoring and managing water quality is crucial for ecosystem health and human well-being. |
| Water quantity | The amount of water available in a water body or system. Balancing water quantity is vital for ecosystem health, water supply, and irrigation. |
| Wetland restoration | Activities aimed at returning degraded or drained wetlands to their natural state. Wetland restoration benefits water quality and biodiversity. |