big island hot spring hot pond

Hot ponds and hot springs on the Big Island

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There are several hot springs / hot ponds in the Puna district on the east coast of the Big Island. Most are publicly accessible and especially if you are staying more than 7 days on the Big Island, these make a great addition to your itinerary. Here you can learn more about the Ahalanui Warm Pond and the Poihiki hot springs.

Did you know that geothermal energy helps to create more than 20% of the Big Island electricity demands? The Puna Geothermal Venture uses the volcanic heat the generate steam for the people of the Big Island.

Please be aware that bathing in the hot springs while having broken skin is not advised. Read more about possible hygiene concerns on the bottom of this page.

What makes Hot Springs hot?

Have you ever wondered what it would be like to sit in a warm pool that is heated by volcanic energy? From personal experience I can tell you that it is pretty great, especially if you think about what makes the water warm!

It rains a lot on the windward (East) side of the Big Island, up to 300 inches (10 meter) per year. Most of this water does not flow directly to the ocean but sinks down into the ground until it hits a barrier. On the Big Island this barrier is made out of salt water which is more heavy than fresh water. The water in this layer then slowly dissipates to the edge of the island and flows into the ocean.

In the volcanic area’s on the Big Island, the water flows through rocks that are heated by magma. This heat is absorbed by the water and taken along to the coast. As the water moves away from the magma it cools down a bit (especially if cold water mixes in), but the water stays warm enough to give the visitors of the Big Island a comfortable warm bath!

Two popular Hot Springs on the Big Island

Warm springs are commonly found along the Puna coast from Cape Kumukahi to `Opihikao. The two most popular and accessible hot ponds are:

Ahalanui Warm or Hot Pond

Ahalanui park is a park build around the Ahalanui Warm Pond. There is a picnic area, showers and toilet facilities. It is a popular destination for locals, and especially in the weekends the place gets crowded. It is best to stay away in the weekends and visit early in the morning (before 9 a.m.) to avoid the crowds.

big island hot spring hot pond
The Ahalanui hot Ponds in the Puna district on the Big Island, Hawaii. The pool is partly walled of from the Ocean to create a lukewarm swimming pool.

Pohoiki Warm Spring

The Pohoiki warm springs are part of the Isaac Hale Beach Park in Puna. To find the biggest pond (which is actually a collapsed lava tube), locate the boat ramp, and from there follow the coastline for about two minutes. You should see the hot pond on your right about 80 yards inland. Read more about these hot ponds on the punastyle website.

Hygiene issues for Big Island Hot Ponds

There are some hygiene concerns about the hot ponds on Hawaii. It is not unusual that the bacterial count in the hot ponds exceeds the EPA and state guidelines (source). This is mostly caused by the combination of poor sanitation in the area and large visitor numbers.

There are hundreds of people (including many tourists) using the ponds each day that are not affected, but as a tourist you are more likely to be vulnerable to the local bacterial population. The best way to stay safe when visiting the hot ponds is to use common sense:

  • Don’t enter the water if you have an open cut or infection.
  • Avoid crowds: stay away in the weekends and visit early in the morning when the ponds have been flushed overnight by tides.
  • Take a shower after you get out of the water and rub yourself clean.