Auckland is subject to a number of hazards. Some are natural and some are strongly influenced by human activity.
Hazards include landslides, erosion, contaminated land, tsunami and tidal or storm surges, flooding, volcanic activity, earthquakes, sea-level rise and subsidence. All of these can create serious human health and safety risks that must be managed. As Auckland continues to urbanise, the risk of impervious surface-based flash flooding (where water cannot soak into the ground and is channelled by constructed barriers) is also likely to increase.