Siargao is low, coastal, and on the Pacific side of Mindanao. Odette is the reference event. Here is what to screen at an exact address.
Siargao sits off the northeastern tip of Mindanao, facing the Pacific. It is low-lying, ringed by beaches and mangrove, and it has grown fast as a destination.
On 16 December 2021, Typhoon Odette (international name Rai) passed directly over it as a very strong typhoon. Anyone buying here should treat that event as the baseline, not as an outlier.
General Luna, Dapa, Del Carmen, Pilar, Burgos, Santa Monica: almost every settlement on the island is near the shore and not far above sea level.
For any address, the first two layers are:
Read them together, never separately. The reasoning is in Yolanda, 2013, which is the clearest illustration of why distance from the shoreline is the wrong measure and elevation is the right one.
Siargao gets substantial rain, and the eastern seaboard pattern means the wettest stretch runs through the amihan months rather than only in the habagat. See the shear line.
On flat, low ground, rain that falls has to leave slowly. Screen flood susceptibility and the distance to the nearest mapped waterway, and cross-check both against what you can actually see. Community-mapped waterway data on smaller islands can be thin; if the report reports no nearby channel and there is one across the road, believe the road. The reasoning is in a layer came back blank.
Del Carmen holds one of the country's larger mangrove forests. Mangrove reduces wave energy and stabilises shoreline. It is not a hazard layer, and it is a material fact about a property behind it.
Ask what sits between the lot and open water, and whether it is protected. A lot sheltered by mangrove that is later cleared is a different lot.
A large share of what stands on Siargao today was built or rebuilt after December 2021, some of it quickly, some of it well, much of it aimed at tourism rather than at permanent residence.
Ask, for anything built:
Then have a licensed structural engineer look at it. On an island that took a direct hit, this is not an optional line item.
On an island, the time to restore power, water, supply, and flights after a major storm is measured in weeks or longer, not days. That is not a hazard rating and it is a real part of what you are buying, especially for a property you intend to rent out or to live in year-round.
Ask people who were there in early 2022 how long each utility took. The answers are specific and they are the most honest description of island living under stress that you will get.
A hazard screening reads public national datasets at a point and reports mapped susceptibility, elevation, and distances. On islands, some community-mapped layers are thinner than on the mainland. It does not assess a structure, model a specific storm, or account for shoreline change since the mapping. Those need the LGU, PAGASA, and a licensed engineer.
CheckHazard does not replace a professional geotechnical or engineering survey.