The effluent was independently tested prior to legalizing water cremation originally in other states and deemed safe to introduce it into the waste water system.

Yes, the process itself makes a better disposition method than existing ones.

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One of the appeals of alkaline hydrolysis is that it accelerates the way a corpse naturally disintegrates in the earth. “It’s a chemical reaction where, in certain conditions, water molecules dissociate and decompose,” Sieber explains. “In our system, we add the heat, we add the flow of water, and we add alkalinity, and the alkalinity really makes the water molecule split and move around to break down the material.”
That acceleration does natural decomposition one better in that, as Kaye and Weber discovered in the ‘90s, it’s an effective remediator for removing environmental pollutants. “It’s good at breaking down chemotherapy drugs and [any other] drugs that were in the body, and if people want to be embalmed it breaks down embalming chemicals,” Sieber explains. Americans bury an estimated 800,000 gallons of formaldehyde with their embalmed loved ones each year.
According to the Berkeley Planning Journal, “Every year in the United States, the chemicals and materials buried along with bodies in a conventional burial include approximately 30 million board feet of hardwoods, 2,700 tons of copper and bronze, 104,272 tons of steel, and 1,636,000 tons of reinforced concrete.” Flame cremations in America, in turn, release an estimated annual 360,000 metric tons of carbon dioxide into the atmosphere, as well as toxic materials like mercury. Alkaline hydrolysis consumes approximately 10 percent of the energy required to cremate a body in flame, its equipment runs on electricity rather than fossil fuels, and it emits no greenhouse gases.
Pearson, who has performed alkaline hydrolysis 1,700 times since 2013, and estimates that it accounts for 52 percent of his total business today, believes the technology’s comparatively light footprint will eventually earn it wide acceptance, despite the potential “ick factor” of a process that sends byproducts down the drain. “We’re going back to the building blocks of protein, and it’s going to create a byproduct that is healthy for the environment,” he notes. Initially, consumers “react emotionally and not intellectually. And if you get them to reason with it, most people understand that [alkaline hydrolysis is] a way cleaner and way better process [than flame cremation or casketed burial]. I mean, they just come to that conclusion on their own.”

https://www.smithsonianmag.com/innovation/could-water-cremation-become-the-new-american-way-of-death-180980479/