Are hot springs safe to soak in?

Most are, if you follow a few rules. Test the temperature before you get in, keep your head above water, skip alcohol and get out when you feel dizzy. Never soak in features that are closed to bathing, such as the hot springs in Yellowstone, where more than 20 people have died from burns.

Can you get Naegleria fowleri from a hot spring?

Yes, it is possible but rare. The CDC says to assume the ameba is present in all hot springs and other warm fresh water. It infects people only when water goes up the nose, so keep your head above water and use a nose clip if you ever go under. Swallowing the water does not cause the infection.

How long should you soak in a hot spring?

There is no single safe time, because it depends on the water temperature and your health. Take short soaks with breaks to cool off, drink water and get out as soon as you feel faint, dizzy or uncomfortable. The CPSC says water at 106 °F can push body temperature to the point of heat stroke, even in healthy adults.

Can you go in hot springs while pregnant?

Ask your doctor first. MotherToBaby says hot tub and sauna use in pregnancy should be limited, because overheating early in pregnancy has been linked to a small increased chance of neural tube defects. The CPSC advises pregnant women to stay at or below 100 °F.

Is it safe to drink alcohol in a hot spring?

No. The CPSC warns that hot water causes drowsiness and alcohol raises the risk of passing out and drowning. Many Forest Service sites and private hot springs ban alcohol outright.

Do natural hot springs have bacteria?

Often, yes. Undeveloped pools are not treated or tested by anyone. The Forest Service reports the highest fecal coliform counts in the Deep Creek drainage right at the hot springs, and Utah regulators warned in 2026 that bacteria at Fifth Water Hot Springs gave several visitors severe rashes and blisters.

Hot springs safety: heat, water quality and the trip in

Updated: October 25, 2026

A soak in a hot spring is mostly safe if you treat the water with the same respect you'd give a river. The serious accidents come from a short list. People step into water that's far too hot, put their heads under, drink before soaking, or underestimate the road, the trail or the river crossing on the way in. This guide goes through each risk with what land managers and health agencies actually say.

Our hot springs directory lists 142 springs with verified public access. 56 of them are free on public land, 54 are natural pools or primitive tubs, 18 need a hike, and for 57 we show safety notes taken from the land manager or operator.

Scalding water and thermal features

Hot spring water can come out of the ground near boiling. In Yellowstone, swimming or soaking in hot springs is prohibited, and the National Park Service says more than 20 people have died from burns after they entered or fell into the park's hot springs. The ground around those features can be a thin crust over scalding water. In July 2025 a 17-year-old broke through the crust near Lone Star Geyser and suffered serious burns to his foot and ankle.

Outside national parks, soakable springs are usually a mix of hot source water and cooler creek or river water, and the temperature changes from one spot to the next. A few examples from our listings:

At Sunbeam Hot Springs in Idaho, source water runs near 169 °F, so you can get scalded where it enters the pools.
Terwilliger Hot Springs in Oregon steps from about 85 °F in the lowest pool to 112 °F in the top one, according to the Forest Service.
The hot springs pool at Baumgartner in Idaho ranges from 98 to 111 °F.

Test the water with your hand or a thermometer before you step in, and go slowly. Keep children close, and stay out of any pool, runoff channel or steaming ground that is signed closed.

Naegleria fowleri: keep your head above water

Naegleria fowleri is an ameba that lives in warm fresh water. The CDC says you should assume it's present in all lakes, ponds, rivers and hot springs. If water carrying the ameba goes up your nose, it can reach the brain and cause primary amebic meningoencephalitis (PAM), which is nearly always fatal. Infections are rare. The CDC counts typically fewer than 10 PAM deaths a year in the US.

Always keep your head above water in hot springs.
Hold your nose or wear a nose clip if you go under by accident or jump in anywhere.
Don't dig in or stir up the sediment at the bottom of the pool.

Swallowing the water does not cause PAM, and properly disinfected pools don't carry the risk. The Forest Service warns about the ameba by name at Deep Creek Hot Springs in California and Spence Hot Spring in New Mexico. Missing signs don't mean the water is free of it. The CDC notes there's no standard test.

Bacteria in undeveloped pools

Natural pools aren't chlorinated, and nobody tests most of them. Heavy use makes it worse. At Deep Creek, the Forest Service reports that fecal coliform counts are highest right at the hot springs and tells visitors not to drink the water. At Spence, it notes that water quality is not monitored.

Fifth Water Hot Springs in Utah is the clearest recent case. In July 2026 the Utah Department of Environmental Quality warned that multiple people had developed severe rashes and blisters after soaking there that summer. Its advice works at any wild spring:

Shower as soon as you can after soaking, and dry off thoroughly.
Don't hike out in wet clothes.
Don't dunk your head, drink the water or get it in your mouth.
Avoid touching the algae on the sides and bottoms of pools, and keep your dog from drinking.

Overheating, soak time and alcohol

Hot water raises your body temperature faster than you'd expect. The US Consumer Product Safety Commission says hot tub water should never exceed 104 °F, considers 100 °F safe for a healthy adult, and warns that soaking at 106 °F can bring on heat stroke even in fit people. A wild spring has no thermostat, so its temperature can be anywhere.

No agency publishes one safe soak time, because it depends on the water and on you. Soak in short rounds, sit on the edge to cool down, and drink water between rounds. Wild Horse Hot Springs in Montana asks guests to stay hydrated and to get out of the water if they feel faint, dizzy or uncomfortable.

Leave the beer in the car. The CPSC warns that hot water causes drowsiness, and alcohol raises the risk of passing out and drowning. Many sites ban alcohol completely, including Terwilliger, Baumgartner and Strawberry Park Hot Springs in Colorado. The CPSC also says people taking medications that cause drowsiness shouldn't use hot tubs.

Medical conditions, pregnancy and small children

The CPSC advises people with heart disease, circulatory problems, diabetes or blood pressure problems to get their doctor's advice before soaking in hot water.

Hot springs during pregnancy

Talk to your doctor or midwife before you go. MotherToBaby, a service of the Organization of Teratology Information Specialists, says hot tub and sauna use in pregnancy should be limited. Several studies link a high body temperature before the 6th week to a small increased chance of neural tube defects, and a few link it to other birth defects before week 12. The CPSC recommends that pregnant women stay at or below 100 °F. Since you can't control the temperature of a natural pool, a cooler pool at a developed hot springs with posted temperatures is the easier choice.

Babies and toddlers

Many operators set age rules for their hottest pools. Lava Hot Springs in Idaho says water above 100 °F is not recommended for children under 2, and Chico Hot Springs in Montana warns that water over 100 °F can harm infants. Most developed hot springs have no lifeguard, so stay in the same pool as your kids.

High water, river crossings and slippery rock

Many natural springs sit on a riverbank, and the river decides when you can soak. Pools can flood during spring snowmelt, and some springs only appear once the water drops in late summer. Reaching a few of them means wading across.

Gila Cliff Dwellings National Monument warns that river crossings on the trails to its springs can be extremely dangerous in high water. Check the weather and river level before you go.
If the crossing looks fast or deep, turn around. Cold snowmelt saps your strength quickly.
Rocks around pools are uneven and slick when wet. The Forest Service says so at Kirkham Hot Springs in Idaho.

Wear water shoes with grip in and around the pools, and real shoes for the trail. At Deep Creek, the 2.5-mile trail drops about 950 feet, so the hike out in summer heat above 100 °F is the hard part.

Remote springs, roads and cell service

The best wild springs are often far from help. Plan as if you'll be on your own:

Cell coverage is often missing. The Forest Service says the area around Bagby Hot Springs in Oregon has no cell coverage for emergency calls. Download maps and tell someone your plan.
Map apps can be wrong. Bagby's page tells drivers not to take smaller roads, whatever Google Maps says.
Winter roads close or turn icy. Forest Road 19 to Terwilliger is not maintained for snow and ice. Strawberry Park requires 4WD with snow tires or chains from November 1 to May 1 under county law.
Desert springs need a full kit. Travel Nevada says Soldier Meadows has no cell service, fuel or food nearby, so carry extra water, fuel and a spare tire.

Leave No Trace at the springs

Wild hot springs stay open when visitors keep them clean. Don't use soap or shampoo in the pool, not even biodegradable kinds. Leave No Trace says to wash at least 200 feet from water, and notes that lotion, sunscreen and insect repellent also contaminate small water sources. Baumgartner bans soap, alcohol and glass in or near its pool. Pack out every piece of trash, since places like Deep Creek have no trash service or restrooms.

Find a hot spring near you

Every listing in our hot springs directory shows the access type, any hike, the water temperature where a source gives one, and the safety notes from the land manager or operator. Browse by state, starting with Idaho (41), Colorado (27), New Mexico (22), Montana (14) and Oregon (11).

This guide is general safety information, not medical advice. Conditions, rules and closures change, so check with the land manager or operator before you go.