4 ways you're doing your laundry all wrong that are harming the environment

The first thing you should do is take a look at the care label on your garment, Diddi said.

It turns out that little sheet sewn into your garments doesn't exist just to irritate your skin — it contains information about the type of laundering your clothes can handle.

After that, Diddi recommends avoiding hot water on synthetic fabrics, which have tiny threads of plastic woven into them.

When heat hits the plastic, it breaks down — similar to how heating up a plastic takeout container can make it melt — releasing microplastics, in the process.

From the wash, microplastics leave the machine with the wastewater and may travel through the water system, eventually heading out to sea.

Similar to hot water, a dryer exposes your clothes to heat which can deteriorate their quality and cause them to release more plastic. 

Microplastics from the dryer are still likely to get into the environment, Diddi said. When the lint from the dryer is thrown away, microplastics often end up flitting into the air or water, Diddi explained. 

Plus, by cutting out the dryer, you'll also be saving energy. An estimated 6% of Americans' home energy consumption comes from the dryer, according to CSU.

Diddi said a great swap is to hang or line dry your clothes. You can buy racks that fold up to accommodate small spaces or find a nice spot outside.

A study of nearly 1,000 college students found that 50% of participants washed a piece of clothing after wearing it only once. 

"That's the main reason why so much of microplastics end up in our waterways," Diddi said.

Every time a piece of synthetic clothing gets laundered, the woven strings of plastic might degrade a little more, she explained.

So instead of throwing all of your clothes into the hamper after every wear, you can use a sniff test and spot treat stains that pop up, Diddi said.

Of course, there are clothing items that need to be laundered more regularly, like underwear, for sanitary purposes.

But otherwise, spot treating is a much better option for synthetic fabrics, Diddi said. 

Finally, there are some companies that make products to better trap microplastics. They include filters that you attach to your washing machine, laundry bags, and laundry balls. 

A 2018 study found that the external filter was the best at catching microplastics compared to other options like bags, but Diddi said overall the research is pretty sparse.

What she does know is that though these products don't eliminate the microplastic problem fully, "they decrease quite a bit of what they'll release in the waterways."

Especially if you separate your clothing based on fabric type, and use one of these products with synthetic clothing, she said.