Homeowners with septic systems know that what goes down the drain matters. Choosing the wrong detergent can upset the delicate bacterial ecosystem in your tank and potentially damage your system over time. One popular brand often used in households is Arm & Hammer Laundry Detergent—but is it safe for septic systems?
Is Arm & Hammer Laundry Detergent Safe for Septic Systems?
Let’s investigate…
What’s Inside Arm & Hammer Detergent?
Arm & Hammer’s ingredient list includes a range of surfactants, enzymes, and cleaning agents designed to tackle tough stains. Some of the key ingredients include:
- Sodium carbonate (washing soda)
- Sodium bicarbonate (baking soda)
- Enzymes like amylase, lipase, protease, and mannanase
- Hydrogen peroxide
- Citric acid
- Borax pentahydrate
- Various surfactants (e.g., sodium laureth sulfate, alkyl ethoxy sulfate)
- Biodegradable polymers and stabilizers
How Do These Ingredients Affect a Septic System?
The good news: most of these ingredients are septic-friendly when used in normal household quantities.
- Biodegradability: Many of the surfactants and polymers are designed to break down naturally in water, meaning they won’t linger in your septic tank or clog your system.
- Enzymes: Enzymes like protease and amylase actually support the breakdown of organic material, complementing the activity of beneficial bacteria already present in the tank.
- Sodium bicarbonate and carbonate: These common household ingredients help neutralize odors and adjust pH without harming septic bacteria.
- Low phosphate content: Arm & Hammer formulas typically avoid high-phosphate compounds, which are a known disruptor in septic environments.
- Low-sudsing: Most versions are formulated for high-efficiency (HE) washers, which also means they’re low in suds—a plus for septic systems, since excessive foam can interfere with waste separation.
Are There Any Concerns?
While Arm & Hammer detergent is generally safe, some ingredients do deserve a closer look:
- Fragrance & Dyes: These are usually present in small amounts, but sensitive systems may benefit from fragrance-free or dye-free versions.
- Borax: Used as a cleaner and water softener, borax is low in toxicity but should still be used in moderation in septic setups.
- Preservatives (e.g., isothiazolones): Found in trace amounts, these chemicals are unlikely to disrupt the tank’s microbial balance when used according to package directions.
Best Practices for Septic System Care
Even if you’re using a generally septic-safe detergent like Arm & Hammer, it’s important to:
- Use the recommended amount—overuse can overwhelm your system.
- Spread out laundry loads to avoid a sudden influx of water and chemicals.
- Consider a fragrance-free or natural formula if your tank is sensitive.
The Verdict: Arm & Hammer Is Septic Safe (With Normal Use)
Arm & Hammer Laundry Detergent is widely regarded as safe for septic systems when used as directed. Its ingredients are largely biodegradable, low in phosphates, and compatible with septic-safe practices. If you’re concerned about added fragrances or preservatives, consider switching to a free & clear or sensitive skin version.