The High-Risk Items That Belong in Your Lease's Ban List
Most lease restrictions focus on the obvious stuff — pets, smoking, unauthorized occupants. But some of the most expensive and dangerous risks to a rental property come from items that never even cross most owners' minds until something goes wrong.
If it's legal in your area, banning water-filled and high-risk recreational items from your rentals isn't overly cautious. It's one of the simplest ways to prevent a catastrophic loss.
The Big One Right Now: Inflatable Cold Plunges
Cold plunges have exploded in popularity, and they're now cheap and easy to buy. For around $100 on Amazon, a tenant can bring home an inflatable cold plunge holding 84 gallons of water — roughly 700 pounds once filled.
That's not a small appliance. That's a nearly 700-pound concentrated load sitting on a floor that was never engineered for it, filled with water that, if it fails or gets moved wrong, can cause tens of thousands of dollars in water damage in a matter of minutes.
It's Not Just Cold Plunges
The same risk profile applies to a whole category of items tenants may not think twice about bringing into a rental:
Aquariums, especially large ones, carry significant weight and a constant risk of leaks, cracked glass, or a catastrophic failure that floods a room with little warning.
Above-ground pools, even small ones, hold hundreds of gallons of water and put sustained weight and moisture stress on a yard, a deck, or a patio surface never designed to handle it.
Trampolines carry a different kind of risk entirely — not water damage, but serious injury liability, especially involving children.
Water-filled inflatables of any kind — pools, slides, novelty items — combine the weight and water-damage risk of a pool with the setup and puncture unpredictability of something never built for long-term use.
Why Insurance Won't Save You
The most important thing for owners to understand: insurance very often does not cover damage or injury from these items — not homeowners insurance, not liability coverage, and not the tenant's own renters insurance.
Water damage from an inflatable pool or cold plunge frequently falls into gray areas that insurers are quick to deny — improper installation, foreseeable risk, or exclusions specific to pools and water-holding structures.
In practice, this means when something goes wrong, the owner is often left absorbing the full cost of repair — structural drying, flooring replacement, potential mold remediation — with no insurance policy stepping in to help.
The Injury Risk Goes Beyond Your Tenant
Trampolines and pools in particular carry a liability risk that isn't limited to the tenant who owns them. Neighborhood kids, visiting family, or a tenant's own children can be injured on equipment that was never vetted, never installed to any safety standard, and often not supervised the way it should be. An owner can end up facing liability exposure for an injury that happened on equipment they never knew was there in the first place.
The Damage Doesn't Stop at Water
Beyond the risk of a sudden failure, these items cause slower, quieter damage too. Above-ground pools and heavy inflatables left on grass for a season will kill the lawn underneath and can leave the ground uneven or damaged long after the item is gone. None of this shows up as an emergency — it shows up as an unpleasant surprise at move-out, usually well beyond what a security deposit was ever meant to cover.
The Simple Fix
This is a case where prevention is dramatically cheaper than remediation. A clear lease clause prohibiting water-filled and high-risk recreational items — cold plunges, aquariums over a certain size, above-ground pools, trampolines, large inflatables — removes the ambiguity before a tenant ever moves one in.
It's also worth communicating the reasoning, not just the rule. Most tenants aren't trying to cause damage; they simply don't realize an $100 inflatable can hold 700 pounds of water or that their renters policy won't cover the aftermath. A lease clause paired with a clear explanation prevents the problem far more effectively than a rule tenants don't understand and are tempted to work around.
Not sure what your current lease actually protects against?
A lease that hasn't been updated in a few years may not account for risks that didn't exist, or weren't common, when it was written. Let's talk. Blair Allen Property Management serves owners across South Dakota, Montana, and Arizona.
Chris Twiggs President, Blair Allen Property Management 📞 605-545-1218 ✉️ chris@blairallen.com