Environmental and land hazards
Volcanic activity
- Location: Central North Island (Taupo Volcanic Zone), Auckland, Bay of Plenty
- Risks: ashfall, lava flows, lahars, and gas emissions can damage structures and make areas uninhabitable
- Notable zones: Rotorua, Taupo, Auckland Volcanic Field
Earthquakes and fault lines
- Location: widespread, especially Wellington, Marlborough, Canterbury, Hawke's Bay
- Risks: structural damage, land deformation, and increased building compliance requirements
- Key fault lines: Alpine Fault, Wellington Fault, Hikurangi Subduction Zone
Landslides and rockfall
- Location: hill and mountain regions such as Wellington, Kaikoura, Coromandel, Queenstown
- Risks: building damage, access issues, and personal safety risks during or after heavy rain or earthquakes
- Indicators: steep terrain, unstable cuts, evidence of previous slips
Flooding
- Location: low-lying coastal areas and river plains such as Auckland, Christchurch, Napier, West Coast
- Risks: water damage, insurance issues, mould, erosion, and infrastructure stress
- Types: river and stream flooding, surface flooding, coastal storm surge
Coastal erosion and sea level rise
- Location: coastal zones, particularly eastern and western seaboards
- Risks: loss of land, foundation undermining, regulatory development limits
- Agencies to check: regional councils, NZ SeaRise project
Wind exposure
- Location: coastal and elevated areas such as Wellington, Taranaki, Southland
- Risks: structural damage, maintenance issues, wind-driven rain intrusion
- Mitigation: design wind zones under the NZS 3604 standard
Fire hazard, rural and urban interface
- Location: semi-rural and forest-adjacent areas such as Canterbury, Otago, Hawke's Bay
- Risks: vegetation fires, especially during droughts and high wind periods
Liquefaction-prone soils
- Location: Christchurch, Hutt Valley, parts of Hawke's Bay and Bay of Plenty
- Risks: ground instability during earthquakes, uneven settlement
- Relevance: ground testing such as geotechnical reports is crucial for new builds or insurance
Contaminated land
- Location: sites with past industrial, horticultural, or landfill use
- Risks: health hazards, development restrictions, expensive remediation
- Check: council HAIL (Hazardous Activities and Industries List) register
Air quality and environmental pollution
- Location: urban areas with high vehicle use or industry, such as Christchurch in winter for PM10
- Risks: health concerns, particularly for respiratory conditions
- Sources: wood burners, vehicle emissions, industrial activity
Useful tools and checks
- LIM reports (Land Information Memorandum): council record of known hazards
- Geotechnical reports: for soil stability, liquefaction risk and similar
- NIWA and GNS Science: for natural hazard mapping and data
- Regional council GIS maps: show flood zones, erosion areas and similar
- Property risk portals and council websites
- residential land and property hazards
- NZ property age risks
