“Do not let wet clothing or towels sit for long periods — they can cause black stains on walls or ceilings.”Have tenants sign a Mold Addendum acknowledging that they understand their role in preventing moisture issues and will notify management promptly if they see any black stains or experience leaks.Landlord ResponsibilitiesAddress leaks, water intrusion, or condensation issues immediately — prevention is key.Hire licensed contractors for roof, HVAC, or plumbing repairs.Keep documentation and photos of all tenant complaints and maintenance actions.Maintain proper ventilation and dehumidifiers in basements or areas prone to moisture.If mold is confirmed, notify tenants in writing about the remediation process and timeline.Tenant ResponsibilitiesReport leaks or water damage as soon as possible.Use ventilation fans during and after showers or cooking.Maintain reasonable cleanliness and avoid over-humidifying the space.Follow the instructions in the Mold Addendum and cooperate with access for repairs.Final NoteMold prevention is a shared responsibility between the landlord and tenant.

I managed to do that with my first house and got a massive flood of water as the old system drained.     

I know to check shutoff valves the water should be turned off.  

And as corporate layoffs in October were at their highest for the month in 22 years, we have some rough waters ahead in terms of consumer discretionary spending.

I have it listed at 1300/ month with water included.

What is the depth of the water and how consistent is it?

I put a new well in back lot to feed water to all new buildings but since I have recently sold that property along with two other duplexes and retained rights to use water lines I put in for a monthly fee.  

My first question is whether there is any arrangement for water and sewage, and I have many more.

Now you may have to get it rezoned , this may take a year or two and you have to fight some neighbors , then you hire an engineer to lay out the lots , roads , water and sewer , which isnt cheap and may take another year or two .

Quote from @Elealeh Fulmaran: Tough combo: rural, 7 acres, hand‑dug well, unpermitted structures, and minor water damage knocks out most agency and FHA options.