Philippine real estate practice has professional duties, and there is no hazard disclosure form. Here is how to get the information anyway.
In some countries a seller must hand a buyer a standard disclosure listing known flooding, structural problems, and hazard zone status. Signed, dated, and enforceable.
The Philippines does not have an equivalent standard hazard disclosure form for residential sales. That does not mean nobody owes you anything, and it does mean the practical burden of finding out sits with you.
Licensed practitioners have professional duties. Real estate brokers and salespersons are regulated under the Real Estate Service Act, with a code of ethics that requires honesty and prohibits misrepresentation. A broker who knows a property floods and says otherwise is not merely being unhelpful.
Subdivision and condominium sales are regulated. Developers operate under the subdivision and condominium buyer protection framework and its licensing requirements, which cover approvals and development obligations.
Fraud and concealment have legal consequences. Active concealment of a known defect is different from failing to volunteer information, and a Philippine lawyer can advise on the difference in your situation.
Consumer protection law applies to certain transactions and practices.
None of that produces a form. It produces a duty not to lie, which is a weaker thing than a duty to disclose.
Three practical reasons to assume you will not be told:
Bad question: "Does it flood here?" Answer: "No."
Better questions, because they require specifics:
Then ask for the answers in writing. A seller who will answer verbally but not in writing has told you something.
The reliable version of disclosure is a warranty you negotiated. Ask a Philippine lawyer to include seller representations about known flooding, known structural damage, known repairs, and any LGU notice, with a remedy if they turn out to be false. The wider version is in put the hazard check in the contract.
Do not rely on any of the above alone.
The same logic runs the other way. A seller who screens the property, discloses honestly, and can show what was done about a finding is in a stronger position than one hoping the buyer does not ask. It also protects you against a later claim of concealment. See hazard risk is part of the price.
This is general information, not legal advice, and Philippine property law and practice are matters for a licensed Philippine lawyer. A hazard screening gives you independent, sourced information about the ground at your coordinates. It is not a disclosure document and it does not create or discharge anyone's legal duty.
CheckHazard does not replace a professional geotechnical or engineering survey.