Not exactly, and it's a much larger problem than just plastic in waterways.

Most plastic waste, such as that from from plastic bottles and bags, is not recycled and is either incinerated like at the huge incinerator up in Saugus, or at 10+ other incinerators across Massachusetts, or put in landfills.

When you burn plastic, its releases all kinds of toxic chemicals into ghe air and water, which have severe health impacts (Source: https://www.sciencedirect.com/science/article/pii/S187802961630158X ).

"The hazardous brominated compounds act as carcinogens and mutagens. Dioxins settle on the crops and in our waterways where they eventually enter into our food and hence the body system. These Dioxins are the lethal persistent organic pollutants (POPs) and its worst component, 2,3,7,8 tetrachlorodibenzo-p-dioxin (TCDD), commonly known as agent orange is a toxic compound which causes cancer and neurological damage, disrupts reproductive, thyroid and respiratory systems."