From Garbology: Our Dirty Love Affair with Trash by Edward Humes (which I’m about halfway through and which is excellent so far):

More than two hundred towns with populations over ten thousand built piggeries where raw garbage served as the feed, as what passed for waste experts at the time [late 1800s to mid-1900s] estimated that seventy-five pigs could dispose of a ton of garbage a day — and provide revenue and meat at the same time. … Worcester, Massachusetts … proudly kept two thousand garbage-swilling swine at its forty-acre piggery near the city limits.

You can read more about the Poor Farm, which eventually became the city piggery, on the City Clerk’s website:

Eventually, the Farm became a piggery. Tons of Worcester garbage were collected daily to feed the pigs, and proceeds from the sale of pork helped the City’s coffers. By 1932, the overwhelming stench of 8,000 pigs convinced everyone it was time to close the Farm.

It should be noted that one of the financial beneficiaries of the piggery was Hope Cemetery, which received part of its income from the sales of these pigs.