Flood Risk in North St Marys, SA: 2026 Assessment

North St Marys, located in South Australia, has a notable flood risk profile based on available data including proximity to waterways, elevation, and historical flood events. The Bureau of Meteorology (BOM) maintains river height and flood warning data for catchments across South Australia.

Some areas near South Creek are prone to flash flooding during heavy rainfall events.

North St Marys faces a moderate risk of flooding due to its proximity to waterways and low-lying areas. Climate change is expected to increase rainfall intensity, potentially worsening flood events.

For a comprehensive property-specific flood assessment including address-level elevation data, flood overlay mapping, and insurance cost estimates, use the ClimateNest full analysis tool. General suburb data cannot replace a site-specific evaluation.

North St Marys sits within ClimateNest's suburb-level hazard model for flood risk. 2.8% of the suburb's land area is mapped in high-risk flood zones and 90.4% in moderate-risk zones, based on the national hazard overlay. Exposure at this scale varies street by street, which is why an address-level check matters before you buy or insure a specific property in North St Marys.

North St Marys (postcode 5042) is tracked in ClimateNest's suburb hazard model, which maps the share of the suburb's land exposed to each hazard at high and moderate levels. The suburb's highest high-risk exposures are surface flood (11.6% of land in high-risk zones), bushfire (10.1% of land in high-risk zones), riverine flood (2.8% of land in high-risk zones). Exposure is not uniform across North St Marys — individual properties can sit well above or below these averages, so an address-level check is recommended before buying, selling or insuring.