How do I run a hot tub safely in a short-term rental?

A hot tub is used by a new group every few days, and nobody in that group knows how your tub works. You can't test the water twice a day the way a public spa operator does, so the job is to leave the tub safe at every turnover, lock it when it's not in use and give guests the rules and the tools to check it themselves. This page lists the official numbers, what Airbnb asks you to disclose and a checklist you can paste into your cleaner's turnover list.

The numbers to keep

These come from the CDC and the CPSC, read on Nov 4, 2026. HostCalmly has not tested any hot tub or chemical product.

What else the sources say:

• Temperature. The CPSC's hot tub warning (first issued in 1979) calls 100°F safe for a healthy adult and says thermostats can be off by as much as 4 degrees, so check the water with an accurate thermometer rather than trusting the control panel.
• Testing. The CDC (opens in a new tab) says to test chlorine and pH at least twice a day, and more often when many people use the tub. It says a DPD test kit is the most accurate and test strips are less accurate. Above 10 ppm chlorine, a test can bleach out and falsely read low or zero.
• No stabilizer in hot tubs. The same CDC page recommends against cyanuric acid, or chlorine products that contain it (dichlor and trichlor), in hot tubs.
• pH drift. The CDC says chlorine works less well above pH 8.0, and below 7.0 pipes are more likely to corrode.
• Too much chlorine. The CDC's guidance for hot tub users (opens in a new tab) tells guests to alert the owner if chlorine reads above 10 ppm or bromine above 8 ppm.

Since you can't test twice a day yourself, leave test strips and a printed card with the ranges above next to the tub. The CDC tells hot tub users to check the water with strips, so asking guests to dip one before they get in follows that advice. Ask them to stay out and message you if a reading is out of range.

Cover, drains, shutoff and children

The CPSC's pool and spa warning (opens in a new tab) gives the physical basics:

• Locked safety cover. Use a locked safety cover whenever the tub is not in use. In a rental, that means the cleaner locks it at turnover and your rules ask guests to lock it after every soak.
• Drain covers. The tub should have the dual drains and drain covers required by current safety standards, and you should check that covers are in place and not cracked or missing.
• Cut-off switch. Know where the pump's cut-off switch is so it can be turned off in an emergency. Show guests where it is too.
• Children. Keep young children away unless an adult is supervising the whole time.

The CPSC's Pool Safely safety tips (opens in a new tab) add that nobody should get into a spa with a loose, broken or missing drain cover, and that users should find the emergency vacuum shutoff before using a spa.

The CDC goes further on children and health. It says not to let children under 5 use hot tubs, to stay out if you have diarrhea, not to drink alcohol before or during use, and for pregnant guests to talk with a healthcare provider first. The CPSC's temperature warning says water above 102°F can harm a fetus in the first three months of pregnancy and suggests pregnant users keep to 100°F.

If your tub sits inside a pool area, the barrier and gate rules in our pool safety answer apply to it as well.

What Airbnb asks you to disclose

Airbnb's safety information on listings (opens in a new tab) article (read Nov 4, 2026) says hosts must disclose safety hazards inherent to the listing, and it names a pool or a body of water as examples. It says hosts should give instructions for any feature that could cause injury if misused, and it names hot tubs. Airbnb says it can act when hosts don't disclose or reduce known hazards, from warnings up to suspending listings or canceling reservations.

Airbnb's August 20, 2025 announcement (opens in a new tab) says it asks hosts whether there is an onsite pool or hot tub and whether it is protected by a gate or lock. Answer those safety details accurately in your listing settings.

In the listing description, cover:

• Where the tub is and whether it has a gate or lock
• The temperature you set it to
• That the cover locks and guests should lock it after use
• Any hours you allow it to be used (for example, to match local quiet hours)
• Who to contact if the water looks cloudy or the cover is damaged

We could not find a Vrbo help article on hot tub disclosure. If you list on Vrbo, check the safety and amenities sections of your listing.

Post rules by the tub

A short sign at the tub does more than a paragraph in the listing. These rules follow the CDC and CPSC points above. Add your own house rules on top.

• Water is set to no more than 104°F. Don't change the temperature.
• No children under 5. Older children only with an adult watching the whole time.
• No alcohol before or during use.
• Shower before you get in. Don't swallow the water.
• Stay out if you are sick with diarrhea. If you are pregnant, check with your doctor first.
• Dip a test strip first. If it's outside the ranges on the card, stay out and message us.
• Never get in if a drain cover is loose, cracked or missing.
• Pump shutoff is at [location]. Call 911 in an emergency. The address is [address].
• No glass at the tub.
• Lock the cover after every use.

The CDC page we read gives no limit on how long to stay in. Check your tub's manual for any limit the manufacturer sets. Our house rules sign tool prints a sign, and the house rules examples show how to word rules guests accept.

Between-stay turnover tasks

The full drain-and-refill schedule depends on your tub, so follow the manual. As one maker's example, Sundance Spas (opens in a new tab) says most home hot tubs used 2 to 4 times a week need draining, cleaning and refilling every 3 to 4 months. It says to rinse filters every 1 to 2 weeks, deep clean them monthly and expect most filters to last 12 to 24 months. It also says more bathers mean more frequent attention. Sundance does not give a schedule for rentals, and a tub used daily by a new group each stay is heavier use than the home example, so use the short end of your manufacturer's ranges and confirm with your manual or a spa service company.

Extra towels belong on the list too. Hot tub towels get wet and come back to the bedroom, so stock a separate set for the tub. Our towel answer covers how many to keep.

Checklist to paste into your cleaner's list

Copy these into the cleaning checklist tool or your cleaner turnover message.

Every turnover

• Remove the cover. Check the locks and straps work and the cover isn't torn.
• Skim debris. Wipe the waterline and the headrests.
• Check every drain cover is in place, not cracked or loose. If one is damaged, lock the cover and text the host. Don't let guests use the tub.
• Test free chlorine (at least 3 ppm) or bromine (4 to 8 ppm), and pH (7.0 to 7.8). Write the readings and the date in the log.
• Adjust chemicals per the product label and the host's instructions. Retest.
• Check water temperature with a thermometer. It must read 104°F or below.
• Top up the water to the fill line if it's low.
• Restock test strips and the range card by the tub.
• Put out clean hot tub towels.
• Check the rules sign is in place and readable.
• Replace the cover and lock it.
• Lock away chemicals.

On the host's schedule

• Rinse the filter (Sundance gives every 1 to 2 weeks for home use, follow your manual).
• Deep clean the filter (monthly in Sundance's guide).
• Drain, clean and refill (Sundance gives every 3 to 4 months for home use, sooner for heavy use).
• Check the underside of the cover and zipper seams for mold (monthly in Sundance's guide).

The insurance question

Ask your insurer in writing whether your policy covers guest injuries at a hot tub. Our insurance basics guide lists the questions to ask a licensed agent.