According to Bob Schildgen, otherwise known as the Sierra Club’s “Mr. Green”: “It’s not a good idea to flush anything from the litter box—even the cleanest non-clumping pine—into municipal sewer systems, because many of them cannot eliminate Toxoplasma, a rather nasty organism sometimes present in cat waste; its release into the ocean has been known to kill sea otters. People with weak immune systems should avoid cleaning cat litter, as should pregnant women. (The bug can cause serious eye or brain damage to a fetus.)”
Schildgen goes on to say that “the most common cat litter contains sodium bentonite, the mining of which tears up land surface (though restoration of mined land is now required). And the disposed litter adds an estimated 4 million tons of material to our landscape and landfills each year. Consider a more organic, biodegradable litter made from corn, corn cobs, citrus scraps, grains, wheat, paper, or wood shavings. Whatever litter you use, to avoid spreading Toxoplasma and other dangerous organisms, never dump it outside. Place it in a plastic bag, tie it shut, and put it in your regular garbage. A biodegradable bag will give it a better chance to break down in the dump.”
https://www.sierraclub.org/sierra/2018-2-march-april/enjoy/can-i-flush-cat-poop-and-scatter-litter
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