Natural hot springs are beautiful but they are not swimming pools. Every year, people are seriously injured or killed at hot springs due to scalding water, drowning, falls, and exposure. Understanding the risks and preparing properly is essential for a safe soaking experience.
This guide covers the real dangers of hot springs and practical steps to mitigate them.
Water Temperature Dangers
Scalding
This is the most common hot spring injury. Source temperatures can exceed 200F (93C). Even pools that look calm can have extremely hot inflows or pockets.
How to stay safe:
- Always test water temperature with your hand or foot before entering
- Enter slowly and feel for hot spots
- Never jump or dive into a hot spring
- Be especially cautious at primitive springs where temperatures are unregulated
- Watch for changes in water flow that might indicate temperature shifts
Thermal shock
Moving quickly between very hot water and cold air (or cold river water) stresses your cardiovascular system. This is particularly dangerous for people with heart conditions.
How to stay safe:
- Transition gradually between temperatures
- Limit time in very hot water (above 106F) to 15-20 minutes
- Have warm clothes ready for when you exit
Bacterial and Amoeba Risks
Naegleria fowleri
The so-called “brain-eating amoeba” is extremely rare but can be found in warm freshwater, including hot springs. Infection occurs when contaminated water enters through the nose. It is almost always fatal.
How to stay safe:
- Never submerge your head in natural hot springs
- Use a nose clip if there is any risk of water entering your nose
- Avoid splashing and roughhousing
Other Bacteria
Hot springs can harbor Legionella, E. coli, and other bacteria. The risk varies by spring and is generally higher in stagnant, lower-temperature pools.
How to stay safe:
- Avoid swallowing hot spring water
- Do not soak with open wounds
- Shower after soaking when possible
- Avoid springs with stagnant water or algae blooms
Environmental Hazards
Unstable Ground
Geothermal areas often have thin crust over boiling water or mud. Boardwalks and marked trails in places like Yellowstone exist because people have broken through the surface and been fatally scalded.
How to stay safe:
- Stay on marked trails in developed geothermal areas
- At primitive springs, test the ground carefully before stepping
- Watch for discolored soil, steam vents, and mineral deposits that indicate underground heat
Toxic Gases
Some hot springs emit hydrogen sulfide (rotten egg smell), carbon dioxide, and other gases. In enclosed or low-lying areas, these gases can accumulate to dangerous concentrations.
How to stay safe:
- If the sulfur smell is overwhelming or you feel dizzy, move to higher ground immediately
- Be cautious in enclosed spaces near hot springs
- Watch for dead vegetation or animals, which can indicate gas accumulation
Slippery Surfaces
Mineral deposits, algae, and wet rock around hot springs create extremely slippery surfaces. Falls are a common source of hot spring injuries.
How to stay safe:
- Wear sandals or water shoes with grip
- Move slowly and deliberately on wet rock
- Use handrails and steps where available
Remote Area Risks
Many hot springs are in areas with no cell service, hours from hospitals, and accessed by unmaintained roads.
Preparation Checklist
- Tell someone your plans, destination, and expected return time
- Carry a first aid kit with burn treatment supplies
- Bring a personal locator beacon (PLB) for backcountry trips
- Check road conditions and weather forecasts
- Carry extra food, water, and warm clothing
- Make sure your vehicle is in good condition with a full tank
If Something Goes Wrong
- For burns: remove from heat source, cool with clean water (not ice), seek medical attention for burns larger than your palm
- For suspected amoeba exposure: seek immediate emergency medical attention
- For gas exposure: move to fresh air immediately, call 911
- For overheating: move to shade, cool gradually, hydrate, seek medical attention if symptoms persist
Altitude Considerations
Many western hot springs are at high elevations (5,000-11,000+ feet). Altitude affects how your body handles heat and dehydration.
How to stay safe:
- Acclimate for at least 24 hours before soaking at high altitude
- Hydrate aggressively
- Limit soak times
- Avoid alcohol before or during soaking at altitude
Special Populations
Pregnant Women
Consult your doctor. Water above 101F may be harmful to fetal development, particularly in the first trimester.
Children
Children overheat faster than adults. Keep water temperature below 100F for children and limit soak times.
People with Cardiovascular Conditions
Hot water immersion affects blood pressure and heart rate. Consult your doctor before soaking in hot springs.
The Bottom Line
Hot springs are worth the effort and the awareness. Know the risks, prepare accordingly, and you will have incredible experiences. The vast majority of hot spring visits are safe and wonderful. Just respect the power of geothermal water.
Despite the risks, the health benefits of hot springs are real and well-documented. Start with a developed, well-reviewed spring to build experience — Idaho has some of the most beginner-friendly options. See the Idaho hot springs guide for springs with campgrounds, good reviews, and clear access info.
Check Conditions Before You Go
Soakr includes temperature data, community condition reports, and detailed access info for every spring. Read what other soakers have experienced before you go. Download Soakr free for iOS.