The Welpr Rating is determined by a scoring formula. The formula takes into account the products safety, user satisfaction, and eco-ethical standing. Click here to learn more.
Best Non-Toxic Drain Cleaner in 2025
Updated:
Aug 28, 2025
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Welpr Approved cleaning products are always free from:
- Harsh disinfectants and irritants: bleach, ammonia, sulfates, and quats
- Endocrine disruptors and preservatives: phthalates, parabens, BHA/BHT, triclosan
- Unnecessary additives: optical brighteners, artificial dyes, and synthetic fragrance (unless certified safe)
- Undisclosed or hidden ingredients
Not all products in this category are Welpr Approved, but they’re safer than most. The ones that meet our full standard will have the Welpr Approved tag. View our full standards here.
Find Non-Toxic Drain Cleaner
Third-party certifications are key indicators of a product's safety, ethics, and environmental impact. Click the icon to verify the certification.
Highlights aren't always verifiable, so you're trusting the brand when they say "lead free", etc. If the highlight icon is "clickable", it means we've verified the highlight.
User satisfaction is calculated using online reviews and a Bayesian average across all cleaning products on Welpr.
The Natural Solution Drain Cleaner, Unscented - Drainbo
Welpr Rating
4.85
/5
Certifications
Highlights
User Satisfaction
Est. Price
$34.25
Product Details
- Uses natural microbes to break down grease, fats, and soap buildup in drains.
- Safe for all types of pipes and fittings without causing damage.
- Free from toxic chemicals and safe for people, pets, and plants.
- Helps prevent clogs with regular use every 30 to 60 days.
- Certified by the Natural Products Association for safer cleaning.
Pros & Cons
Pros
- Works reliably for maintaining clean and odorless septic systems.
- Encourages a biological approach to unclog drains, reducing reliance on harsh chemicals.
- Effective for long-term prevention of drain blockages when used regularly.
Cons
- Some users may find it requires multiple applications for best results.
Ingredients
Ingredients can vary by product variation and may change at any time by the manufacturer. For the most complete and up-to-date list of ingredients, refer to the product packaging.
To analyze individual ingredients, use this EWG tool.
Ingredients: Aqua, Bacillus Ferment Blend, Lauryl/Myristil Glucoside (Corn/Coconut-Derived), Citrus Limon (Lemon) Peel Oil, Coconut Acid, Glycerin (Vegetable-Derived), Citrus ExtractAqua, Bacillus Ferment Blend, Lauryl/Myristyl Glucoside (Corn/Coconut-derived), Citrus Limon (Lemon) Peel Oil, Coconut Acid, Glycerin (Vegetable-derived), Citrus Extract
Third-party certifications are key indicators of a product's safety, ethics, and environmental impact. Click the icon to verify the certification.
Highlights aren't always verifiable, so you're trusting the brand when they say "lead free", etc. If the highlight icon is "clickable", it means we've verified the highlight.
User satisfaction is calculated using online reviews and a Bayesian average across all cleaning products on Welpr.
Septic System & Cesspool Treatment, Unscented - Earthworm
Welpr Rating
4.85
/5
Certifications
Highlights
User Satisfaction
Est. Price
$15.99
Product Details
- Uses natural bioenzymatic processes to prevent septic and cesspool backups.
- Contains natural enzymes that are safe for plumbing and do not contain harsh chemicals.
- Benefits include digestion of household waste and odors, enhancing septic system efficiency.
- Eco-friendly and safe for use around kids, pets, and family.
- Utilizes a liquid formula with three effective doses.
Pros & Cons
Pros
- Works effectively for septic tank maintenance.
- Long-time users have reported positive results.
- Has surprised some users with its effectiveness.
Cons
- Some users may not experience results as expected and might consider alternatives.
Ingredients
Ingredients can vary by product variation and may change at any time by the manufacturer. For the most complete and up-to-date list of ingredients, refer to the product packaging.
To analyze individual ingredients, use this EWG tool.
Ingredients: Pasteurized Bran, Sand, Sodium Bicarbonate, Sodium Chloride, Ceteareth-10, Viable Culture Blend (Lipase, Protease, Amylase, Cellulase)
Save 20% on purchases on Rustic Strength.
Organic White Cleaning Vinegar - Rustic Strength
Welpr Rating
4.8
/5
Discount Code
WELPR20
Certifications
Highlights
Est. Price
$27.00
Product Details
- Concentrated 100-grain organic white cleaning vinegar
- Made from renewable, plant-derived ingredients
- Non-GMO and biodegradable
- Can be diluted 1:1 with water to make standard 50-grain cleaning vinegar
- Multi-purpose: removes glue, odors, soap scum, rust stains; cleans glass, cookware, coffee makers, toilets; polishes metals; unclogs drains; softens fabrics; and more
- Cost-effective and eco-friendly—reduces shipping weight and container use
- Not for use on natural stone, wood, or varnished surfaces
Pros & Cons
Pros
- Non-toxic formula that is gentle for sensitive individuals.
- Free from harsh chemicals while still cleaning effectively.
- Light, pleasant scent that is not overpowering.
- Safe choice for those with chemical sensitivities or health concerns.
- Versatile brand offering multiple safe household products.
Ingredients
Ingredients: 100 Grain White Vinegar
Third-party certifications are key indicators of a product's safety, ethics, and environmental impact. Click the icon to verify the certification.
Highlights aren't always verifiable, so you're trusting the brand when they say "lead free", etc. If the highlight icon is "clickable", it means we've verified the highlight.
User satisfaction is calculated using online reviews and a Bayesian average across all cleaning products on Welpr.
Drain Millipede, Unscented - FlexiSnake
Welpr Rating
4.75
/5
Certifications
Highlights
User Satisfaction
Est. Price
$9.99
Product Details
- Say goodbye to stubborn hair clogs in sinks, showers, and tubs quickly.
- Features more than 4,000 tiny hooks to easily tackle even the toughest clogs.
- No need to dismantle drain pipes, simply pull out the blockage in minutes.
- Reusable tool that can be cleaned easily with soap, water, and a brush.
- Easy for anyone to use without requiring plumbing expertise.
Pros & Cons
Pros
- Powerfully effective at removing hair and debris from drains without the need for harsh chemicals.
- Environmentally friendly way to maintain clear drains, perfect for those avoiding toxic products.
- Flexible and easy to use, reaching intricate drain angles effortlessly.
- Reusable with proper cleaning, offering long-term value for health-conscious households.
- Quick and efficient, often solving clogs within minutes, saving time and effort.
Cons
- Cleaning the tool after use can be challenging, especially for those who prefer low-maintenance tools.
- May not be suitable for all drain types, particularly those with complex or deeply embedded clogs.
Ingredients
Ingredients can vary by product variation and may change at any time by the manufacturer. For the most complete and up-to-date list of ingredients, refer to the product packaging.
To analyze individual ingredients, use this EWG tool.
Ingredients: Steel Core
Third-party certifications are key indicators of a product's safety, ethics, and environmental impact. Click the icon to verify the certification.
Highlights aren't always verifiable, so you're trusting the brand when they say "lead free", etc. If the highlight icon is "clickable", it means we've verified the highlight.
User satisfaction is calculated using online reviews and a Bayesian average across all cleaning products on Welpr.
Drain Maintainer with Enzymes - Mighty Mint
Welpr Rating
4.65
/5
Certifications
Highlights
User Satisfaction
Est. Price
$14.99
Product Details
- Naturally keeps your drains clear and free from odors with an enzyme-based formula.
- Prevents buildup in sinks, showers, tubs, and other drains for smoother flow.
- Crafted with eco-conscious ingredients, including farm-grown spearmint.
- Free from harsh chemicals and safe for pipes and septic systems.
- A sustainable choice for maintaining cleanliness without harmful residues.
Pros & Cons
Pros
- Effectively eliminates unpleasant drain odors.
- Pleasant minty fragrance without harsh chemicals.
- Easy to use with simple instructions.
- Safe for septic systems and environmentally friendly.
- Can be conveniently stored for future use.
Cons
- May not be effective for slow or clogged drains.
- Some users noted the scented effect as temporary.
Ingredients
Ingredients: Purified Water, Natural Enzymes, Plant-Based Emulsifiers, US Spearmint Oil
Our Product Rating System
First, Camille (co-creator of Welpr) hand picks cleaner product options from a variety of sources.
Next, we collect information about each product's safety, consumer satisfaction, and eco-ethical standing.
Finally, we run all this information through an algorithm that calculates the Welpr Rating.
Welpr Rating:
5.0/5
Part 1: Product safety
We evaluate safety information from 3rd party organizations (e.g. EWG, Made Safe, etc.). Instead of relying solely on any one of these companies for safety information, we assess all of them.
Part 2: Consumer satisfaction
We scour the web for consumer ratings and reviews to verify products are not only cleaner options, but also effective. Products can either be Above Average, Average, or Below average for their respective category (e.g. cleaning products).
Part 3: Ethics & Environment
When you buy a product, you’re supporting that company with your dollars. We believe it’s important to support ethical companies, so we pool together certifications that verify a company's ethics and environmental impact.
Common Harmful Chemicals in Drain Cleaner
Chemical Name
Why it’s harmful
Ammonium Hydroxide
Ammonium hydroxide is a corrosive substance that can cause injury to the skin, eyes, and respiratory tract. High concentrations, either through inhalation or prolonged exposure, can lead to significant respiratory issues, including inflammation, pneumonia, and pulmonary edema. It is used in various industries such as fertilizers, dyes, explosives, plastics, and cleansing agents, among others. Due to its intense pungency and potential to cause extreme irritation and even life-threatening conditions, precautions such as wearing protective clothing and immediate cleansing of affected areas are recommended. It should be stored away from combustibles and heavy metals, in well-ventilated areas and in specified containers. Disposal guidelines also need to be referred from environmental regulatory agencies due to the hazardous nature of the substance.
Sources:
The Facts About Ammonia, Chemical Safety Facts: Ammonia, ATSDR Chemical Profile, EPA: Ammonia, Aquatic Life Ambient Water Quality Criteria for Ammonia - Freshwater, EPA Chemical Profile, Mass Casualties from Acute Inhalation of Chloramine Gas, Ventilatory disorders associated with occupational inhalation exposure to ammonia, Ecological and toxicological effects of inorganic nitrogen pollution in aquatic ecosystems: A global assessment, TOXICOLOGICAL PROFILE FOR AMMONIA ,
Sulfuric Acid
Sulfuric acid, a clear and highly corrosive liquid, is employed in the creation of fertilizers, other acids, and glue, and is used in petroleum purification, metal pickling, and lead-acid batteries. It can cause severe burns, is a potential human carcinogen, can trigger pulmonary edema, and may erode tooth enamel.
Formaldehyde
Formaldehyde is a colorless, flammable gas with a pungent smell that's naturally produced in small quantities in human bodies and is also known as methanal amongst other names. It's used in the production of various items such as fertilizers, paper, plywood, and urea-formaldehyde resins as well as in some foods and household products like antiseptics, medicines, and cosmetics. Exposure to formaldehyde, which can occur through breathing contaminated indoor air, tobacco smoke, or ambient urban air can lead to respiratory symptoms, irritation of the eyes, nose and throat and has been linked to lung and nasopharyngeal cancer as well as leukemia. The EPA considers formaldehyde a probable human carcinogen (Group B1) and inhaling it can cause bronchospasm and pulmonary edema. Commercially, it's sold as formalin in solutions of 37%, 44%, or 50% and long-term exposure can cause first-degree burns, skin sensitization, squamous cell nasal cancer, and chronic pulmonary obstruction.
Sources:
Formaldehyde and Cancer Risk, Cleaning Products & Indoor Air Quality, No More Toxic Tub, Campaign for Safe Cosmetics: Preservatives, Campaign for Safe Cosmetics: Formaldehyde And Formaldehyde-Releasing Preservatives, Formaldehyde may be found in cosmetic products even when unlabelled, Formaldehyde Found in Popular American Beauty Products, Hair Salons - Formaldehyde in Your Products, Formaldehyde in cosmetic products
Sodium Dichloroisocyanurate
Sodium Dichloroisocyanurate is toxic upon ingestion and act as a strong oxidizer, posing a fire hazard when exposed to organic materials. It may react violently with combustible substances and decompose due to heat or water, releasing toxic gases such as chlorine. It can cause irritation to the skin, eyes and respiratory tract, and prolonged exposure can result in corrosive skin burns. Inhalation of high concentrations can lead to acute pulmonary edema. It may also explode from shock, friction, or other ignition sources, and can cause fires upon contact with combustible materials.
Sodium Hydroxide
Sodium hydroxide, also known as caustic soda or lye, is an odorless white crystalline solid that absorbs moisture from the air. It generates significant heat when dissolved in water or neutralized with acid which may ignite combustible materials. It is highly corrosive and is typically used as a solid or in a 50% solution. Sodium hydroxide is used to manufacture a variety of products including soaps, rayon, paper, explosives, dyestuffs, and petroleum products. Exposure to this substance may cause severe burns, necrosis, and pulmonary edema, depending on the concentration and exposure method.
Sodium Hypochlorite
Sodium hypochlorite is a clear liquid with a strong chlorine odor, predominantly used as bleaching agents or disinfectants in commercial cleaning solutions and water purification systems. Sodium hypochlorite is often used in a dissolved state. It is corrosive to skin and can cause pulmonary edema from high inhalation exposure. Its ingestion can lead to methemoglobinemia, and a 3% to 5% solution causes burnings of the mouth and throat. The anhydrous form of this compound is highly explosive.
Benzisothiazolinone
Isothiazolinones are preservatives known to cause allergic contact dermatitis, primarily in workers involved in manufacturing industries like paint, paper, rubber, and air fresheners. Additionally, there's a reported case of occupational asthma from exposure to this chemical among workers.
Authors
Camille May, Product Curator
Olushola M. Awoyemi, Medical Reviewer
