Can a Brita Water Filter Make You Sick?

Brita Filters adsorb contaminants like bacteria, heavy metals, and organic chemicals.

Brita Filters don’t stop there. They help you stay healthy too.

Short Answer

As a water filter technician, I can confirm that expired or contaminated filters can make you sick. Expired Brita filters can cause bacteria issues and perform poorly. The pitcher filter’s moist environment is ideal for bacteria growth. If the filter isn’t replaced on time, it can lead to higher bacteria concentrations, making you sick.

Contaminated filter cartridges are the biggest problem in filtration. Bacteria, small metal particles, and trapped dirt can pass through the filter and enter your drinking water, causing nausea, gas, and diarrhea. Moldy Brita water filters also make you sick. Moldy water can cause allergies and pathogens. Cleaning and replacing the filter prevents illness.

Many customers get sick from using old or contaminated Brita filters. After a year of use, I found mold and bacteria in a customer’s filter cartridge. The customer didn’t realize the filter was causing stomach issues. The customer felt better and had no health issues after replacing the filter.

In conclusion, Brita water filters must be replaced and cleaned regularly to prevent bacteria and mold growth, which can make you sick. Monitor the filter expiration date and replace it every 2-3 months or as the manufacturer directs. As a water filter technician, I recommend following these guidelines to keep your drinking water safe.


Bacteria can make you sick if they get into your drinking water. This can happen when there’s a system problem or contamination like sewage.

The Safe Drinking Water Act regulates tap water treatment in the US to remove bacteria. Local authorities may advise you to boil your water if it’s contaminated.

Brita filters remove contaminants like lead, copper, and mercury and reduce chlorine taste and odor, but they cannot eliminate bacteria.


Mold is a fungus that grows in damp places like roofs, pipes, and under wood or tile floors and ceilings.

Mold can be harmless, but some types produce toxins that may cause allergic reactions or health problems in sensitive people. Mold exposure can cause sneezing, congestion, and a runny nose.

Mold exposure can exacerbate asthma and lung diseases. Mold reactions are more likely in children, older people, and people with preexisting medical conditions or compromised immune systems.

Mold exposure usually causes symptoms within hours or days. Still, the duration depends on how much mold is in your system and how much you were exposed to. Visit your doctor to be diagnosed and treated for mold allergies or sensitivities.


Photoautotrophic algae are found in almost every water body on Earth. Photosynthesis produces 40–85% of oxygen, keeping the ecosystem healthy.

Algae range in size and type from single-celled planktonic organisms to 300-foot ocean kelps. For survival, they often form symbiotic relationships with fungi and other animals.

Cyanobacteria and algae produce toxic byproducts that can make you sick. Rashes, stomach cramps, nausea, and diarrhea result from exposure to these agents.


Mildew grows on damp surfaces like leather, fabric, and paper. In homes with poor airflow and low lighting, like bathrooms and kitchens, it’s common.

Mildew smells musty and discolored fabrics. Mildew can also eat fabric until it tears or falls apart.

Mildew can turn brown from white or yellow. It’s easier to remove than mold, but it can cause health problems if left unchecked.


Viruses are microscopic germs with protein coatings and genetic material. They can spread deadly diseases like HIV/AIDS, Ebola, and COVID-19, as well as colds, flu, and warts.

Unlike bacteria, viruses can exist outside cells but cannot reproduce or carry out metabolic processes. They belong to their kingdom of life because they are not organisms.

Under an electron microscope, viruses are either rod-like or spherical (coccus). (bacillus). Both have an envelope and capsid, a hollow tube-shaped body. Viral particles attach to host cells using proteins they produce and “hack” them to produce more virions, which could quickly take over thousands of host cells.