Does Reverse Osmosis Remove Arsenic From Water

Does Reverse Osmosis Remove Arsenic From Drinking Water

Affiliate Disclaimer: Please note that some of the links on this website are affiliate links, which means that we may earn a commission if you click on the link and make a purchase. However, we want to assure you that all of our recommendations are 100% genuine and unbiased. We have a strict editorial process in place that ensures our recommendations are based solely on our assessment of the products and services we review. Our goal is to provide you with the most accurate and helpful information possible so that you can make informed decisions about the products and services you purchase. We appreciate your support of our website, so thank-you for reading.

Charlie W. Palmer
Follow me
In this article, we’re going to be discussing whether reverse osmosis removes Arsenic from water, but firstly, it’s important to understand what exactly reverse osmosis is and how it works.

How Does Reverse Osmosis Work?

Reverse osmosis is a water treatment process that uses pressure to force water molecules through a semipermeable membrane.
The carbon filter’s semipermeable membrane only allows water molecules to pass through, while catching larger molecules such as salt ions, bacteria, and viruses.
Each RO system is different in the amount of filter stages that they have available, with different activated carbon filters, and the more expensive units have a higher number of stages. Each stage is developed to filter out a certain type/band of mineral, molecule, heavy metal, bacteria, virus’, etc.
Some RO systems even have UV (ultraviolet light) which helps to sterilize water by eradicating DNA of bacteria and RNA of viruses.
Overall, RO helps to improve overall water quality. However, it’s not advisable to drink RO water for long periods of time, with the water having core minerals removed, therefore, if it were to be used as drinking water, remineralization could be done by adding small amounts of Himalayan sea salt (seek expert advice here), since it contains elevated levels of minerals like magnesium, calcium, and iron.

What is Arsenic and where is it used?

Arsenic is a naturally occurring element that can be found in small amounts in the earth’s crust. It has been used in many different ways over the years, including as a pesticide, as a wood preservative, and in the manufacturing of glass and semiconductors. While it is no longer used in these applications, it can still be found in some consumer products, such as cosmetics and traditional Chinese medicines. Arsenic is also a by-product of mining and smelting operations.

How does arsenic get into our municipal water?

Municipal water can become contaminated with arsenic if it comes into contact with naturally occurring arsenic in the environment, or if it is used to treat water that contains high levels of arsenic. Arsenic can also enter the water supply through industrial and agricultural activities.

Arsenic’s Effect on Human Health

Arsenic is a poisonous chemical element that has been shown to be harmful to human health in both short- and long-term exposure scenarios.

In the short term, arsenic can cause nausea, vomiting, and diarrhea. In the long term, it has been linked to an increased risk of cancer, particularly skin cancer. Arsenic is also known to be toxic to the liver, kidneys, heart, nervous system, and can cause neurological problems.

There is no safe level of arsenic exposure for humans, and even small amounts can cause health problems.

With that being said, we can understand why you’d want to remove it from the water that you drink or consume.

Does Reverse Osmosis Remove Arsenic?

Reverse osmosis is a filtration process that uses a high-pressure membrane to remove contaminants from water. While reverse osmosis can remove arsenic from water, it is not always effective in removing all of the arsenic. Studies from reputable sources show that a RO system can remove anywhere from 70-99% of arsenic from water.

Since arsenic is a heavy metal that can be found in both organic and inorganic forms. Inorganic arsenic is more common in water supplies and is more difficult to remove than organic arsenic.

What Else Does Reverse Osmosis Remove?

Reverse osmosis also removes other contaminants from water, including fluoride, chloride, calcium, arsenic, chloramine, heavy metals, pesticides, and pharmaceuticals.

Unfortunately, RO does remove healthy minerals in the water, such as magnesium, sodium, potassium, and calcium

While most municipal water supplies in the United States are required to meet strict safety standards set by the Environmental Protection Agency (EPA), trace amounts of these and other contaminants can still end up in tap water. That’s why many people use reverse osmosis systems to further purify their drinking water.

How Else Can I Remove Arsenic from My Water Supply?

If you are concerned about arsenic in your water supply, there are a few things (besides installing a reverse osmosis filtration system) that you can do to remove it.

First, you can install a whole-house filter that is designed to remove arsenic. You can also have your water tested and, if necessary, treated by a professional. Finally, you can try using bottled water for drinking and cooking.


In conclusion, does reverse osmosis remove arsenic? Yes, it does. According to the reputable studies we linked above, reverse osmosis is an effective way to remove anywhere from 70-90% of arsenic from water. It is also a safe and affordable method of water filtration, filtering many harmful water contaminants including bacteria and viruses.

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *