Our Water

Geothermal water is in our DNA

Welcome to the Deep Blue Hotel & Hot Springs, where relaxation and rejuvenation await you. As you soak in the soothing warmth of our geothermal waters, we invite you to learn more about the rich history and incredible benefits of hot springs bathing. Sit back, and relax. 

Where does the water come from?

a natural source of nature

Have you ever wondered where our Geothermal water comes from?  

Deep in the earth is a naturally occurring ancient formation called the Dilwyn Aquifer which holds the  geothermal water. 

This natural basin captures rainwater as it seeps through the ground and dunes, trickling down through layers of rock, and eventually reaching the  Dilwyn aquifer  where it becomes naturally heated by the earth’s core. This water rich with health restoring minerals and heat is then drawn back up to the surface, bringing with it a wealth of minerals and therapeutic benefits.

What makes our geothermal waters so unique? It’s the perfect combination of nature’s gifts. As the water percolates through the Earth’s crust, it absorbs minerals such as calcium, magnesium, and silica. 

These minerals contribute to the remarkable healing properties and soothing effects of our hot springs. The water’s temperature, rich mineral content, and unique composition work in harmony to create an unforgettable bathing experience.  

How do we access the water?  The Deep Blue harnesses the natural geothermal waters by a bore set vertically into the earth.  The bore at the Deep Blue is considerably deep at 850 meters. 

At the Deep Blue the earth’s hot core heats the water and the subsequent pressure forces it naturally to the surface so there is no need for a pump. The water at the Deep Blue arrives at the surface at 46°C before being fed to the Bath House and each of the rockpools inside the Sanctuary.


Therapeutic benefits

Health restoring minerals & heat

Let’s explore what makes our geothermal water truly special. The combination of heat and minerals in the water creates a therapeutic environment that can benefit both your body and mind. The warm temperature helps to relax muscles, improve circulation, and relieve tension, while the minerals nourish your skin and promote a healthy glow. As you immerse yourself in these soothing waters, allow the natural surroundings and gentle sounds to transport you to a state of pure tranquility.

Beyond the relaxing sensation of soaking in warm water, geothermal bathing offers a multitude of physical and emotional benefits. The therapeutic heat stimulates blood circulation, which can help relax muscles, reduce tension, and relieve joint pain. The mineral-rich waters are known to nourish the skin, leaving it soft, supple, and rejuvenated. As your body relaxes, your mind also finds solace, allowing stress to melt away and a sense of calm to wash over you.

Geothermal bathing offers a range of long-term benefits for your overall well-being. Regular bathing in these mineral-rich waters can enhance your immune system, reduce stress levels, and even alleviate symptoms of certain skin conditions. It’s a holistic experience that promotes a sense of balance and harmony between your body, mind, and spirit.

unique mineral composition

magnesium 53 mg/L

Maintains normal heart rhythms, converts blood sugar to energy, and maintains muscle tissue and hormone levels.

Sodium 940 mg/L

Sodium is an essential nutrient necessary for maintenance of plasma volume, transmission of nerve impulses and normal cell function.

Silica 20 mg/L

Silica helps form the building blocks of collagen. Collagen is needed to keep skin springy and elastic, and provide crucial protection and structure to your organs and joints.

Iron 1.8 mg/L

Builds up the quality of blood and increases resistance to stress and disease. Prevents fatigue and promotes good skin tone.

Boron 3.4 mg/L

Boosts brain activity, builds muscle mass, and strengthens bones.

Sulphate 49 mg/L

Rids the body of toxins and promotes the health of bones, hair, nails, fluids in joints and vertebral discs. Sulfur is an anti-inflammatory.

Selenium 0.001 mg/L

Selenium can boost immune function, improving hair and nail health, and supporting a healthy thyroid

Manganese .024 mg/ L

Mangenese helps nourish the nerves and brain. It also plays a role in fat and carbohydrate metabolism, calcium absorption, and blood sugar regulation.

Fluoride 1.4 mg/L

The elastic fibers of the skin and the surface of bones and teeth are made up of Calcium fluoride. Promotes hardness and stability.

Potassium 76 mg/L

Potassium is essential for life. It offsets the effect of sodium in raising blood pressure, and moves nutrients into cells and waste products out of cells.

Calcium 65 mg/L

Calcium is a mineral most often associated with healthy bones and teeth. It also plays an important role in helping muscles to contract, and regulating normal heart rhythms and nerve functions.

Zinc 0.014 mg/L

Zinc is essential for many of the body’s normal functions and systems, including the immune system, wound healing, blood clotting, thyroid function,

Copper 0.002 mg/L

Copper is a mineral that is found throughout the body. It helps your body make red blood cells and keeps nerve cells and your immune system healthy. It also helps form collagen, a key part of bones and connective tissue.

Chloride 870 mg/L

Provides musculo-skeletal benefits.

Geothermal bathing experiences at the Deep Blue

Hot Springs

Bath House

Private Bathing Rooms
at the Bath House

Lifecycle of our Geothermal Water

Lifecycle of our Geothermal Water

Pristine geothermal water comes to the surface through natural upward force from the aquifer. The Clear geothermal  water enters the pools directly from the bore at 46° C.  As soon as the water is exposed to air the iron in the water begins to oxidise leading to turbidity. Turbidity is the cloudiness or haziness of a fluid.

The water is sent through a filter to remove a small portion of the iron – just enough for clear sight – and then pumped straight into the pools.

The Geothermal water in the outdoor Sanctuary and Indoor Bath House is continuously flowing and is not recirculated into the bathing pools.  To maintain heat and cleanliness the geo water is continually changing over.  This means the water in each pool is being constantly fed in and drawn out so that each pool’s body of water is completely replenished every 4 hours.  

 That is to say that at periodic intervals fresh geo water is introduced into the pools and spent water is discharged.  A minimum of 25% of the volume of each pool’s water is turned over every hour.

This process not only keeps the water sanitary it is also used to maintain the pools individual temperature ranges – water flows through slightly faster for hotter pools and slightly slower for warm pools.  Outdoor weather – heat, cold, rain – also contributes to changes in pool water temperatures.

Repurposing a precious resource

Did you know the Deep Blue re purposes the spent Geothermal water from the Hot Springs to provide heat to other areas of the Hotel?

The spent geo water then has a second life when it is used in the heat exchange system to heat the fresh water circulating through the hydronic radiators to heat the Deep Blue hotel in Winter. It is also used to heat the fresh water circulating through the underfloor heating in the Hot Springs locker room

Not only does this drastically reduce the Hotel’s consumption of electricity, it is also provides our guests with the cleanest form of heating. 

Hot Springs

Experience the outdoor Hot Springs Sanctuary


Check out our amazing  packages and deals 


Slow it down and stay awhile in seaside comforts

Bath House

Discover the Indoor Bath House 


Deep Blue is committed to your well-being.  For this reason, we advise against bathing for individuals with pre-existing medical conditions that may be exacerbated by:

Immersion in hot water (maximum 42°C)

Exposure to cold water (4°C)

Contact with specific minerals

Shock treatment from transitioning between hot and cold pools

Our friendly staff is here to assist you in enhancing your experience. Please don’t hesitate to reach out to us on 03 5559 2050.

general questions

If you are expecting a baby, it's important to be mindful that extended soaking in hot water can pose potential risks to your baby's well-being. As a result, we recommend refraining from hot water baths during pregnancy.

Instead, we warmly invite our expectant mothers to explore the range of treatment options available at our Day Spa, such as a soothing relaxation massage or a rejuvenating facial. For your safety, we kindly request that all pregnant guests consult with their healthcare provider before making any spa reservations.

To ensure your experience is tailored to your specific needs, please get in touch with our friendly reservations team at 03 5559 2020. They will be happy to assist you and discuss the details of your pregnancy, including your current trimester, so that we can customize a truly relaxing and safe experience just for you.

To ensure your safety and enhance your overall experience, we discourage individuals with underlying medical conditions that may be negatively affected by the following factors from participating in our bathing facilities:

  • Prolonged exposure to hot water (maximum 42°C)
  • Extended immersion in cold water (4°C)
  • Direct contact with specific minerals
  • Abrupt changes in temperature from transitioning between hot and cold pools

For those with any of the subsequent medical conditions, we strongly recommend seeking medical guidance before using our pools:

  • Conditions associated with high fever
  • Severe hypertension
  • Malignant tumors or cancer-related illnesses
  • Liver, kidney, or circulatory disorders
  • Medical conditions that pose a high risk of bleeding or hemorrhaging
  • Anemia
  • Congestive heart failure, recent stroke, or recent heart attack
  • Pregnancy
  • Diabetes

Furthermore, individuals who are post-surgery or have open wounds should refrain from bathing in our facilities until they have fully healed and received clearance from a medical professional.

We encourage all guests to consult their physician before using our pools or engaging in any spa treatments. Upon your arrival, we may request your signature on a waiver form, confirming that you have been informed of this important information. Your well-being is our utmost priority.

As a wellness-focused destination, we strongly recommend that guests consider rescheduling their appointments if they are feeling unwell in any capacity. In such cases, if necessary, we advise seeking guidance from a medical professional before participating in any bathing activities.

Deep Blue Hot Springs values the well-being and shared experience of all our guests. Therefore, if a guest arrives displaying any signs of illness, we will kindly encourage them to reschedule or cancel their booking to safeguard the health and comfort of others.

In the event that a guest is unable to attend due to illness, we kindly request a minimum of 24 hours' notice in alignment with our cancellation and amendment policy. We understand that unforeseen circumstances can arise, and if this is the case, we urge guests to promptly contact our Reservations team before their scheduled visit to make the necessary arrangements. Your consideration helps us provide a safe and enjoyable experience for all.

We understand that some of our guests may have limited mobility, and our dedication to ensuring accessibility for everyone at the hot springs is unwavering. If you require any assistance or have specific mobility requirements, we encourage you to get in touch with our knowledgeable reservations team at 03 5559 2050.  They are well-equipped to assist you in planning your visit to ensure it meets your needs and expectations.

Our cancellation policy requires a notice of at least 24 hours before the scheduled arrival time. Cancellations made within this 24-hour window will result in a full cancellation fee equal to 100% of the booking cost. However, if you inform us of date changes more than 24 hours before your scheduled arrival, we will do our best to accommodate your request.

All ages 5 years and over are welcome to attend any of the daytime  sessions however must be accompanied by a parent or guardian at all times if aged under 16 years.

The twilight session at the Hot Springs Sanctuary (6.00- 9.00pm) is reserved for adult’s only ( ages 16+). 

The entrance to the Deep Blue hot springs reception is located on Worm Bay Road, Warrnambool.

The entrance to the Bath House & Day Spa is accesible via 16 Pertobe Road Warrnambool.

We accept Seniors & Veteran Cards. These cards entitle holders to a 10% discount for bathing only. To book, please visit us or call

03 5559 2050 and present your valid Seniors or Veterans card upon check in.

All persons entering the Sanctuary are required to pay the entry fee with the exception of 'companion card' holders.

Food & Beverages are available for puchase at Tide Cafe & Bar which is located on the ground floor of the Deep Blue Hotel 

You are not permitted to bring your own food and drinks to the Hot Springs other than water.   We recommend you bring  your own refillable drink bottles and utilise the water refill stations which are available within the Sanctuary and the  Bath House.

Talking on mobile phones is not permitted in the Sanctuary or Bath House. If you choose to bring your phone to take  photos, please ensure it is switched to silent and refrain from taking photos of any other person other than yourself or consenting friends or family.  Please do be mindful and respectful of the privacy other guests.

Appropriate bathing attire must be worn and you are welcome to bring your own towel, robe and appropriate footwear. Robes and towels are also available to hire.  It is important to stay hydrated and we recommend you bring a re-fillable ( non-glass) water bottle which can be replensished at water stations located at the outdoor Sanctuary and the Indoor Bath House.

A designated storage area is available within the change facility with the option to hire a locker hire upon arrival. Hire lockers feature USB charge ports and RFID  lock technology.  We recommend you do not bring valuables with you when visiting the Sanctuary and we cannot be held responsible for the loss or damage of personal belongings.

The Deep Blue Hotel offers 80 guest rooms including 6 penthouse suites with expansive ocean views. For all accommodation inquiries please phone our hotel reception on (03) 5559 2000 

Disclaimer: No part of this site is intended to diagnose, treat, or cure any illness. Nothing on this site is to be construed as medical advice; the authors are without medical training and are not medical professionals.