The 5 Best Soap For Hard Water

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Updated: April, 2022

Hard water can make your skin dry and itchy, but what type of soap should you use? If you have been struggling with the issues of “Best soap for hard water,” as I’ve been having, this article will help answer some questions.

Hard water has a big percentage of dissolved minerals such as magnesium and calcium than normal water. When using hard water, we will have to use more soap to have our things cleaned. And it’s because when soap mixes with hard water, magnesium iron immediately reacts with the soap molecules forming residue that doesn’t dissolve easily.

Unfortunately, about 85 percent here in the United States of America live in a city or state with hard water issues. The rainwater runs via rock and soil before moving to natural aquifers, where the water is collected, resulting in the larger mineral collection ranging from 15 to 20 GPG.

Hard water can be very damaging to some household appliances. Not only does it rust the faucets and pipes, but it can damage your skin and body as well. If you have hard water, you’ll want to use the best soap for hard water on the market. Here is a list of hard water soaps that we have researched and reviewed. Read on for what you should keep in mind when choosing the best soap for hard water, and learn why these picks are the perfect match based on these criteria:

  1. Best for overall: Charlie’s Soap Booster & Hard Water Treatment
  2. Best Bar Soap For Hard Water: Castile Bar Soap by Kirk’s
  3. Best Bath Soap for Hard Water: Pre de Provence Artisanal French Soap Bar
  4. Best Shaving Soap For Hard Water: Proraso Shaving Soap In A Bowl
  5. Best Hand Soap For Hard Water: Mrs. Meyer’s Clean Day Liquid Hand Soap

Which is the best soap for the hard water, and how did we select the best?

The answer is the simple best soap for the hard water should act similar to when used in soft water. Meaning it will quickly form suds and also leather, not leaving cud in the user’s tub. However, when you decide to look for the best bath soap, you will come across countless inventions, different models, and designs out there.

This means without a supportive guide, you might land on ineffective soap for hard water, especially if it’s your first time purchasing such a product. Fortunately, we did an in-depth review for you; we tested different and many soaps before picking the below list of the best five. Further, customer reviews also significantly helped us choose the best bathing soap in hard water alongside our professional reviewing.

Did you Know?
The measurement of “hardness” falls into two categories: Parts Per Million (ppm) or Grain per Gallon(gpg).

Comparison of Top 5 Best Soap For Hard Water

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Charlie’s Soap Booster

  • Weight: 2.64 pounds
  • Dimensions: 3.75 x 3.75 x 6.1 inches
  • Material: Phosphate Free
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Castile Bar Soap by Kirk’s

  • Weight: 1.68 pounds
  • Dimensions: 25 x 40 x 10 inches
  • Ingredients: Coconut oil, Aloe vera
  • Skin Type: Sensitive
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Pre de Provence Artisanal French Soap Bar

  • Weight: 5 ounces
  • Dimensions: 3.5 x 1 x 2 inches;
  • Ingredients: Shea butter
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Mrs. Meyer’s Clean Day Liquid Hand Soap

  • Weight: 2.09 pounds
  • Dimensions: 8.38 x 3.13 x 8.25 inches
  • Scent: Honeysuckle
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Proraso Shaving Soap In A Bowl

  • Weight: 3.53 Ounces
  • Dimensions: 2.5 x 2.5 x 2.5 inches

Top 5 Best Soap For Hard Water Reviews

Choosing the best hard water soap can be challenging; fortunately, we have compiled for you some of the best available in today’s market;

#1 Best for overall: Charlie’s Soap Booster & Hard Water Treatment

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The ideal formulation for this hard water soap is designed not to leave any scale build-up on the user’s bathroom. Plus, it is made with an unscented smell to maintain and protect the user’s skin pH. Generally, this product is environmentally tested and approved safe phosphate made to soften the hard water scale. Further, this soap ensures your skin is clean without having sticky residue.

Essentially, this soap is also made to remove minerals like calcium from the user’s hard water, preventing detergents from working. Our skin will get well moisturized and protected with this product due to its hydrating lather, which gently cleans our skin. In addition, you don’t need to worry about suffering from skin reactions since this product is100 percent non-toxic.

In addition, this gentle soap is versatile, meaning someone can utilize it all over your body. It is still formulated similarly to hypoallergenic and fragrance-free. We loved how this product locks moisture in users’ skin barrier, allowing it to typically stay soft, firm, and touchable for a long duration.


  • Environment, animals, and human-friendly
  • Restores your skin’s moisture
  • Creamy lather
  • Hypoallergenic
  • Best hard water treatment
  • Septic safe


  • Some users claim that this soap can melt fast when forgotten in water because it is very moisturizing
  • Has decyl glucoside which is not preferred by some users

#2: Best Bar Soap For Hard Water: Castile Bar Soap by Kirk’s

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For some of us with very sensitive skins, this is the best bar soap for hard water we can go for. Generally, this product is formulated with natural premium coconut oil. Besides, its formulation makes it lightly hydrate users’ skin quickly, leaving it smooth and soft. Plus, it still helps to soothe all types of irritation or inflammation on our skin.

Further, this soap is appropriate for all skin types, including oily, dry, and sensitive skin. It rinses off so easily and is compatible with even more hard water. In essence, this product does not contain any potential skin-irritating ingredients such as unnecessary colorants, sulfates, parabens, etc.

The soap is made with a light and fresh scent, which helps in making the user smell clean and feel invigorated. In addition, you will love how this soap creates creamy lather right in the shower. It is also known to wash away any oil, dirt, and all other related impurities efficiently, beating hard substances in hard water.


  • 100 percent coconut oil and Aloe vera
  • Restores your skin’s moisture
  • Gluten-free
  • Multi-purpose
  • Vegan certified
  • Soft and smooth lather
  • Gentle yet powerful


  • Sometimes this soap may be drying when you utilize it excessively
  • Not perfect for some hairs

#3: Best Bath Soap for Hard Water: Pre de Provence Artisanal French Soap Bar

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This bar soap is formulated with creamy and thick Shea butter that moisturizes our skin. This leaves our complexion radiantly soft and growing to the touch. Another feature is that this soap creates creamy and luxurious lather easily because it is finely milled. As a result, it never leaves any greasy residue on the user’s skin all through. It can also effectively remove the dead skin cell, dirt, and stubborn oils on your body.

I would want the customers to know that hard water soaps from Pre de province tend to follow the old-style French way when making soaps. This means milling their soaps three times to eventually create the soft and smooth texture of the clients’ soap. Essentially, I loved how pre de hard water bar soap leaves users’ skin smelling fresh like roses.

Generally, this process aids in increasing the soap’s longevity. In turn, we can as well use this soap for a long duration without having melting issues. Thus, this product is very beneficial for relaxing and opulent showers probably for the individuals who fall in love with bubbles. Additionally, this soap is made with crushed rose petals, which help in exfoliating out skin.


  • Fair-trade certified
  • Coms with a great and calm scent
  • Excellent fragrance
  • Creates luxuriously creamy, easily
  • Shea butter in it moisturizes users skin deeply
  • Triple-milled increase soap smooth texture and longevity


  • Exfoliating power from rose petals might be abrasive, especially when scrubbed too hard
  • The packaging is a bit small to some users
  • Not all that bubbly compared to others

#4: Best Hand Soap For Hard Water: Mrs. Meyer’s Clean Day Liquid Hand Soap

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Mrs. Meyer is naturally manufactured from natural surfactant, ensuring that it will be friendly on users’ skin. Plus, it contains different essential oils comprising cedarwood and bergamot that aids in purifying our skin. In this case, the user’s skin can never go flaky or dry with this specific hard water soap.

In essence, this soap also offers thorough and deep washes. Thanks to aloe vera, glycerin, and olive oil extracts, the user’s skin gets supple and moisturized. Admirably, the soap tends to leave an exceptional scent, which is slight and nostalgic white flowers ad rainwater. You will love how your hands will be left floral and smelling fresh for a while after using it.

Each set provides the clients with three bottles of this soap ranging 12.5 oz. Meaning it will serve you for a long duration before running out. Overall, this soap is made to quickly lather on users’ puff or loofah effortlessly; it is dermatologist-tested and approved, ensuring your skin will be safe.


  • Three bottles per set
  • Contain aloe Vera, olive oil, and glycine to moisturize users hand
  • Made with the fresh, light yet nostalgic scent
  • Prevents our hands from staying flaky and dry
  • Incredibly gentle as hard water bar soap


  • This soap can leave the users hands sticky when not rinsed well
  • It may not treat most skin rashes and conditions

#5. Best Shaving Soap For Hard Water: Proraso Shaving Soap In A Bowl

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Proraso lather up quickly, and it’s a highly slick lubricant. The addition of eucalyptus and menthol make this soap suitable for different skin types. This soap is perfect for some of us who may want the best nourishment and moisturizing shaving cream.

Generally, this soap leaves your room refreshed and comfortable as well. Further, it has many properties that soothe our skin to reduce inflammation on the skin. Finally, the cream tube is easier and convenient to carry and travel around anytime.

The safety of this shaving soap should not bother you, as it’s 100 percent safe for humans and animals based on the manufacturer. Further, it is friendly to the environment because it’s gluten-free and biodegradable. According to the experts, this shaving soap hard water can significantly help creative and active individuals when it comes to shaving.


  • Vegan certified
  • Great for even sensitive skin
  • Top-notch safety and quality
  • Pure natural ingredients
  • No colorant
  • Perfect for moisturizing and protecting the skin


  • The scent of this soap is somehow strong, according to some users
  • It may not work so well to specific types of skin

Related: Best Kitchen Faucet For Hard Water

Buyers Guide

Below are key considerations of hard water soap before purchasing.

(a) Type

Have a clear and specified idea of which type of soap you are looking for in terms of ingredients used in making it. This is because we have specific and different issues may be with scent etc.

(b) Water content

Hard water bar soaps are made to have various sets of elements. Therefore, you should test your waters before purchasing to find out specific minerals in them.

(c) Quality

No matter the wonderful smell hard water bar soap has, quality is the key.

(d) Color

Since these soaps come in different colors, you can even choose to go with one that matches your bathroom. Besides, the manufacturers utilize artificial colors where some bar soaps come with naturally decent colors because of ingredients used to make them.

(e) Accessibility and availability

Generally, it is good if you go for hard water soap that is not hard to find. Look for a product that is accessible around your area to avoid the extra cost of moving to long distances to get the soap.

What is hard water soap testing?

According to a recent study, 85 percent of water here in American is rich in magnesium and calcium. And this condition is known as hard water, which can significantly impact our hygiene, utility bill, and plumbing.

Therefore, hard water testing helps us pinpoint precise steps necessary when it comes to alleviating this specific issue. The expert recommends that this test can be conducted in different ways, including:

– The soap method test

– Visual check test

– Hard water kit test

– Laboratory test

The entire standard unit that measures hard water uses grains per gallon; For example, in Arizona, Phoenix water hardness tends to vary between 17 and 12 gpg. Anything beyond 15 GPG is rightly considered as severe hard water; on the other side, anything beyond 11 gpg is hard and produces all signs of hardness such as reduced energy efficiency, dry skin, pervasive scale build-up, etc. So overall, regardless of the method you will use, knowing how to typically test the hardness in water should be the first step to ensure clean, pure, and safe water for your loved ones.

Final verdict

Hard water can turn into a problem and badly affects our hair, skin, plumbing, and clothes as well. This is because hard water has minerals making it susceptible to leave build-ups from regular soap residues. And this, in turn, might clog your pores, where the body releases the natural oils from, leading to eczema or acne.

Further, hard water can also make users’ skin dry, leading to wrinkles and fine lines. In this case, Castile bar soap, Charlie’s soap booster, and hard water treatment, Proraso shaving soap are among the top-rated and dependable hard water soaps to solve these issues.

Generally, these soaps are designed to lather easily in hard water, naturally moisturize our skin, and prevent it from staying dry. Based on reviews from different users, the above list of hard water soaps is recommended to use as hard water softener to prevent damages caused by hard water.

Frequently Asked Questions

Q1. How can we protect our skins from hard water?

The helpful solution is utilizing best hard water softeners, as we have listed above. Further, you can make everything more accessible by using warm water when bathing with this hard water soap, and this way, you will never have soap residue on your skin.

Q2. Does dove soap work in hard water?

Yes, the dove is better in creating creamy lather in hard water alongside nourishing users’ skin, washing away the grime and dirt.

Q3. Is zest soap good for hard water?

From the mixed reviews we got from different users, this soap is ideal when it comes to ensuring users no scale build-up in users’ bathrooms. This is because of its excellent fragrance and creates enough lather in hard water.

Q4. The best soaps for saltwater?

According to the experts, potassium soaps seem to be more soluble in saltwater compared to sodium soaps. Thus, potassium soap wins in seawater usage.

Q5. Which soap is best for hard water?

The answer is simple. A soap that contains necessary additives, designed to effectively soften hard water while eliminating firm and improving lather, is the best to use for hard water.

About Author:

Danyal is a Freelance Copywriter that has been writing for online publications including Home improvement, newsworthy blogs and even a few personal blogs. He has a passion for writing and loves to share his knowledge with everyone who wants quality information.