Is Washing Soda Non Toxic? | The Honest Safety Profile

That distinction matters if you’re switching to low-tox cleaning and wondering whether the powder in your laundry room is actually safe around kids and pets. Washing soda (sodium carbonate, pH ~11) is not a systemic poison like certain pesticides, but its high alkalinity means it can burn tissue on contact. The practical answer splits along one line: handled correctly, it’s fine; mishandled, it’s a hazard. Here’s what the safety sheets actually say.

What Makes Washing Soda Different From Baking Soda?

The confusion is the most common mistake in low-tox cleaning. Baking soda (sodium bicarbonate, pH ~8.3) is edible and used in cooking. Washing soda (sodium carbonate, pH ~11.5) is not food-safe and is corrosive to soft tissue. They look similar—white powders—but they are chemically distinct, and swapping one for the other in a recipe can cause injury. The FDA lists sodium carbonate as “generally regarded as safe” for specific regulated uses, but that designation does not mean it is safe to eat or inhale.

Washing Soda’S Real Risks: Ingestion, Skin, And Lungs

The bulk of the danger comes from the substance’s strong alkalinity, not from systemic toxicity. Here is how each exposure route stacks up.

• Ingestion: Swallowing even modest amounts can cause vomiting, throat swelling, and severe gastrointestinal burns. Do not induce vomiting if swallowed—rinse the mouth and call Poison Control (1-800-222-1222).
• Skin and eye contact: The powder or a strong solution can burn skin with prolonged contact and cause corneal damage if rubbed into eyes. Wear rubber gloves during handling. If it gets in eyes, flush with water for 15 minutes and seek medical help if irritation persists.
• Inhalation: Breathing washing soda dust can irritate the respiratory tract. Long-term exposure to high concentrations—unlikely in home use—has been linked to lung function changes. Avoid creating airborne dust by scooping gently.

How To Use Washing Soda Safely

The safety precautions are straightforward and match how you would handle any strong alkaline cleaner.

1. Wear rubber gloves. Direct skin contact with the dry powder or a concentrated solution can cause irritation.
2. Avoid creating dust. Scoop the powder slowly. If powder becomes airborne, move to fresh air.
3. Dissolve in water before use. Once dissolved, washing soda does not produce toxic fumes. Use ½ cup per laundry load as a booster.
4. Store in a child-resistant container. Keep it away from children and pets. The resealable HDPE containers from brands like Pure Original Ingredients or the Arm & Hammer box are fine as long as the lid is secure.
5. Do not use on aluminum, fiberglass, or waxed surfaces. The alkalinity will damage the finish.

One common misconception: washing soda does not disinfect. It removes soils and reduces microbial load through physical cleaning, but it does not kill bacteria, viruses, or fungi. If you need a sanitized surface, follow with an appropriate disinfectant.

Is It Safe For Septic Systems And The Environment?

Washing soda is biodegradable—it breaks down into sodium carbonate and water. In diluted amounts used in a typical laundry load, it poses low risk to septic systems. The environmental concern is concentrated discharge: undiluted washing soda is acutely toxic to freshwater invertebrates such as Daphnia magna, and raising the pH of effluent above municipal limits is a problem if you dump large quantities. For standard home use, the environmental footprint is minimal.