The house inspector cannot determine whether ingress of water or humidity will be a problem in the future based on a one-time inspection. As a home buyer, you should obtain a sworn petition from the seller detailing the frequency and severity of water ingress history.
Don't trust anyone regarding drainage. No homeowner tells details about leakage and water damage while selling it. Some even say that it only gets water when it rains a lot. But you need to understand that there is no home that hasn't faced water damage problems. So, it is better to get in touch with professionals via https://revampo.ca/fr/blog/infiltration-deau to know about the causes of water damage.
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Most problems with basement drainage are caused by inadequate control of surface rainwater. The floor around the house must be sloped so that water flows from the foundation.
The main purpose of the gutter is to collect water on the roof and drain the water at least 5 feet from the bottom or into a functioning storm drain. Gutters that are clogged, burst below the slope, or leak too close to the plinth are the most common causes of basement leaks.
If there are problems with the drainage of the basement, the first step should be to repair the sewer system and roof drainage. Please watch out for contractors who recommend expensive solutions. Excavation, moisture protection, and/or drainage tile installation may be required.