Are Bath Bombs Safe for Septic Tanks

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Written By Jamila W.

Are bath bombs safe for septic tanks? The answer is they can be, but only if used in moderation and without harmful ingredients. Some other factors, such as the ingredients used, contribute to its effects on septic tanks.

I am environmentally cautious and prefer using products that won’t negatively affect the ecosystem. My research aims to help you make a more informed decision when selecting bath bombs by telling you all the must-know facts. Here are some of the topics we will go through.

  • How a septic tank works
  • Effects of bath bombs on septic systems
  • Prevention measures for bath bombs related plumbing issues
  • The correct application of bath bombs to reduce negative impact on septic tanks

To find out about this and much more, keep reading and be enlightened.

What Are Bath Bombs?

Bath bombs are popular self-care products that help create a relaxing, spa-like experience at home. The standard bath bomb contains baking soda and citric acid, producing iconic fizzing and bubbles when sodium bicarbonate reacts.

They also often contain moisturizing oils, soothing fragrances, and fun extras like flower petals or glitter. While there is a bath bomb for every mood, overuse can damage septic tank systems. When not used in moderation, the fats, oils, and solid ingredients in bath bombs can build up in pipes and the septic tank itself.

Are Bath Bombs Septic Safe?

Not all bath bombs are safe. Some products might harm your health because of the ingredients used during manufacturing. These products might cause skin irritation or rashes or even affect your plumbing system.

Choosing bath bombs made with natural products is recommended, and synthetic bath salts should be avoided. Most bath bombs contain the same substances.

These are the common bath bomb ingredients:

  • Epsom salts
  • Essential oils
  • Baking soda
  • Citric acid
  • Decorative solids
  • Sodium bicarbonate
  • Lavender buds
  • Flower petals, confetti, and glitter

Checking ingredients, following recommendations, and practicing general septic care will allow you to enjoy a healthy septic system without the occasional plumbing issues.

To enjoy bath bombs safely, it’s best to limit use to no more than once per week. Using a drain strainer can help catch any solid particles. And getting your septic tank pumped regularly is key for ongoing system maintenance.

With some care taken to choose septic-safe bath bombs and moderate frequency of use, it’s possible to soothe sore muscles and soak without worrying about harming your home’s plumbing.

How Does the Septic System Work?

The waste and wastewater from your home go into the septic tank after traveling down the drains. Inside the septic tank, solids and liquids separate into layers, with the lighter liquids towards the top. The liquids eventually flow from the tank to the drain field, which filters the water back into the ground.

The solids stay in the bottom of the tank. Bacteria work to break down the solids into sludge. Over several years, this sludge layer builds up until it needs to be pumped out.

Problems start when the septic tank can’t work right. Maybe there’s too much water, or the bacteria is unhealthy. A failing septic tank could cause backups, send wastewater to the drain field before being treated, or overload the drain field with excess water.

An unhealthy septic tank leads to big problems. This is where using too many bath bombs can negatively impact the system. All those added oils, solids, and excess ingredients disrupt the delicate balance inside the tank. By using bath bombs responsibly, you can avoid issues with your septic system.

What Makes Bath Bombs a Problem for Your Septic Tank?

Are bath bombs bad for septic tanks? They may not all be bad, but here are some factors that can cause this.

Presence of Insoluble Salts

Some bath bombs are made with insoluble salts. They do not completely dissolve and can cause blockages. Over time, the salts accumulate in the septic, and items like hair and cotton can attach and stick to it, causing blockages. These salts can also kill the bacteria in your septic system if you use them in high amounts.

Accumulated Fats 

The fats or kinds of butter in some bath bombs can lead to clogged drains if they solidify before reaching the pipes. These ingredients, like shea butter, have varying melting points, and if the bath water cools too much, they may harden within the plumbing.

For instance, cocoa butter has a melting point of around 36°C, while an average bath is around 40.5°C. So if the water temp drops to 37°C or below before draining, the cocoa butter could re-solidify and cause blockages. Even bath bombs with little butter should be used carefully in case small amounts accumulate.

Checking ingredients and water temp before draining can prevent solidified fats from causing plumbing issues. Using products sparingly and maintaining drains is important for homes with septic systems.


Oils in bath bombs behave differently from solid fats regarding septic system effects. Since oils are liquid at room temperature, they can pass through drainage pipes after use more quickly than fats. However, the oils then accumulate as a floating scum layer inside the septic tank itself.

Over time, the buildup of oils from frequent bath bomb use can overload this scum layer inside the tank. Excess oils can also disrupt the proper separation and processing of solid wastes within the septic system environment.

While oils may not clog plumbing like fats when draining, they can gradually accumulate and cause issues in the septic tank when bath bombs are overused. Checking ingredients and moderating the frequency of use is important to avoid disrupting the septic balance.


The “solids” in many bath bombs refer to things like glitter, flower petals, and plastic confetti that do not fully dissolve in water. These undissolved particles can cause pipe clogs to build up over time. They also accumulate in the septic tank, blocking effluent filters and potentially damaging downstream components.

Even natural botanical solids can burden septic tanks by adding excess oxygen demand. Meanwhile, synthetic solids like glitter and microplastics especially accumulate and cause septic issues. Using a drain strainer to catch particles is wise.

However, the best solution is to avoid bath bombs with any undissolving solids to prevent plumbing and septic system disruption. Checking ingredients and understanding septic system limitations is key for homeowners to enjoy bath products responsibly.

How to Correctly Use Bath Bombs Without Affecting Your Septic Systems

Bath bombs and septic systems don’t usually get along. However, when correctly used, your septic systems can maintain their functionalities. Here are some tips for having septic-safe bath bombs:

  • Moderate use: Limit bath bomb use to 1-2 times weekly. The occasional treat is fine, but overuse can overload a septic system.
  • Check ingredients: Opt for bath bombs with natural ingredients like Epsom salts, baking soda, essential oils, etc. Avoid glitter, plastic bits, artificial dyes, and fragrances, which are harsh chemicals.
  • Prevent clogs: Use a drain cover or strainer to catch loose particles. Ensure the bath bomb fully dissolves and does not leave an oily film.
  • Space out usage: Avoid multiple people using bath bombs on the same day. Space out usage throughout the week for less impact.
  • Follow instructions: Carefully follow usage directions on the bath bomb packaging, and don’t overdo it. More is not always better.
  • Pump regularly: Get your septic tank pumped every 3-5 years to clear out accumulated solids and sludge.
  • Add enzymes: Consider using septic-safe enzymes/bacteria monthly to help break down oils and allow the bath bomb to dissolve completely.
  • Limit other chemicals: Be mindful of other household chemicals like cleaners and detergents that impact septic systems.

Using bath bombs sparingly and carefully choosing natural options is the best way to enjoy relaxing soaks while keeping your septic system in good working order.

Things You Can Do to Prevent Plumbing Issues Resulting From Bath Bombs

Bath bombs are not bad to use, even regularly, if proper care is taken. There are tips homeowners can follow to enjoy fizzy soaks while preventing drain and pipe issues:

  • Clean drains periodically with vinegar, which helps dissolve bath bomb residues before accumulating. Let vinegar sit for a few minutes before flushing with hot water to clear debris.
  • Use a drain strainer or filter to catch undissolved particles, oils, or salts that could otherwise go down the pipes. Filters prevent the buildup of hair and particles that can cause clogs.
  • Place bath bombs in nylon socks or pantyhose before putting them in bath water. This contains any decorative solids, glitter, or other additives so they don’t go down the drain.

With preventative maintenance like drain cleaning, filters, and containment methods, bath bombs can be used responsibly, even regularly. Being proactive protects pipes from issues over time. Homeowners can relax and enjoy the spa-like experience of bath bombs without worrying about plumbing damage.


Are Bath Salts Safe for Septic Systems?

Yes, bath salts, in general, are considered safe for septic systems as long as they are used in moderation. They are made from natural minerals without added artificial additives that can affect the bacterial balance in the septic tank.

Are Lush Bath Bombs Septic-Safe?

Yes, most Lush bombs are safe because they are often made with biodegradable and septic-safe ingredients. However, since they sometimes contain oils, butter, and other additives for fragrance and skin benefits, it’s best to use them sparingly.

Lush Bath Bombs
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Bath bombs can be a delightful addition to your bath routine without harming your septic system. It’s crucial to use bath bombs that contain natural, septic-safe ingredients and to use them in moderation. 

Remember to always check the labels of your bath bombs for eco-friendly ingredients and avoid those with plastics or excessive oils. By taking these measures, you can enjoy the luxury of bath bombs and maintain a healthy septic system.

Ready to relax with a bath bomb? Just pick one that’s septic-safe, use it responsibly, and keep your system functioning.