Most landlord conversations about hazards happen after the event, at the worst possible time, between two people who are both upset. It is a much better conversation to have in advance, in writing, when nothing is wet.

Three reasons to screen a property you rent out

1. You own the damage. Tenants own their belongings; you own the structure, the wiring, the fixtures, and the repair bill. Knowing the exposure lets you make cheap decisions early: raise the outlets during a renovation, use finishes that survive wetting, keep the electrical panel high.

2. You own the relationship. A tenant who was told the ground floor can take water during a bad storm, and who was shown where the shut-off is, reacts very differently from one who discovers it at 2 AM. The first is a manageable event. The second is a dispute and often a vacancy.

3. You own the vacancy risk. A unit with a bad reputation on the street is harder to fill, and the street always knows. Preparing beats hoping nobody remembers.

What to read

Screen the exact address, and for a unit in a building, the building itself. Then look at:

• Mapped flood exposure at the pin, understood as probability rather than a schedule, which is what flood return periods explained covers.
• Elevation and distance to the nearest mapped waterway, which together tell you how close the water is and how much height you have.
• Storm surge for coastal addresses.
• Distance to the nearest mapped active fault, which is a structural question for an engineer.

The tenant-side version of this list is in renting a house or apartment. Reading it will tell you exactly what a careful tenant is going to ask you.

What to actually do with the finding

1. Fix the cheap things during turnover. Between tenants is the only easy time to raise an outlet or replace a soaked-and-dried cabinet with something better.
2. Write a one-page property note. Where the shut-offs are, where water has entered before, which parking level floods, who to call. Give it to every tenant.
3. Say it plainly in the conversation. Not as a legal shield, as information. Tenants respect it and it sets expectations.
4. Check your insurance and know whether it covers the structure only, and what an occupied-versus-empty period means. Background in how your hazard profile can affect home insurance costs.
5. Keep the drainage clear. The single highest-return maintenance item on most rental properties, and the one most often deferred.

If you own several units

Screen them all and keep the reports together. Portfolios tend to accumulate quietly in the same few areas, which means the same exposure repeated several times without anyone noticing. Comparing them side by side, the way comparing two lots describes, shows you concentration you may not have realised you had.

What to put in writing

Verbal warnings evaporate exactly when they matter. Put the practical information in the lease packet, in plain language, and keep it short enough that someone will actually read it:

1. What has happened before. If water has entered the property, say so, say when, and say how high.
2. Where the shut-offs are. Water and electricity, with a photo.
3. What the tenant should do. Move valuables up, do not use the basement parking during heavy rain, call this number.
4. What you are responsible for versus what they are. Structure and fixtures versus contents, and what your insurance does and does not cover.

This is not a legal document and I am not offering legal advice; your contract terms and disclosure obligations are a question for a lawyer. It is an operational document, and its purpose is that the person living in your property makes good decisions at 2 AM without needing to reach you.

The maintenance items that actually matter

Landlord maintenance budgets tend to go to what tenants complain about, which is not the same as what protects the building. For a property with any flood exposure, three items outrank the cosmetic list:

• Drainage, cleared on a schedule. Not when it rains. Before.
• The roof and its fixings, checked once a year by someone who goes up there.
• Electrical, raised where it can be raised, done during turnover when the unit is empty anyway.

None of those show in a listing photo. All of them decide whether a bad season costs you a weekend or a quarter of the year's rent.

The honest limit

A hazard screening reads public national datasets at your coordinates. It does not inspect the building, assess the wiring, or tell you your legal disclosure obligations, which are a question for a lawyer and depend on your contract and local rules. What it does is stop you from being the last person to learn what the ground under your rental does in a bad week.

CheckHazard does not replace a professional geotechnical or engineering survey.