Sweep FAQs

The incredible thing—to me, a Lancastrian—is that the first organized public street sweeping was started by Benjamin Franklin. He proposed the idea in 1762, and it took about 7 years to get started. At that time, cities like Philadelphia were rife with all kinds of nasty things, like manure (still occasionally an issue in Lancaster County), food scraps, chamberpot refuse, and more. Franklin’s sweep initiative got brooms in the hands of workers to prioritize the streets and sidewalks and keep them clean and clear. Philadelphia at one time had a reputation as the country’s cleanest city, believe it or not.

But in terms of mechanical sweeping: That was Joseph Whitworth, in 1843 in then-filthy Manchester, England. His sweeper was actually horse-drawn! In 1849, C.S. Bishop filed a U.S. patent for another horse-drawn variation. Motorized street sweeping didn’t start until 1913, all the way in Boise, Idaho. Then that sort of stayed the same way until the 1970s, when street sweepers started to take on the dimension they have today.

First, water quality: most storm drains lead directly to rivers, lakes, or the ocean, so anything that accumulates on the street (sediment, leaves, oil, tire rubber, brake dust, heavy metals) ends up there after the next rain. Since the Clean Water Act of 1972, the EPA has considered regular street sweeping a best management practice for controlling stormwater pollution. For Lancaster and cities in this region, actually, one of the main environmental concerns is the runoff from cities into the waterways that eventually end up in the Chesapeake water system. That’s a hugely important ecosystem for wildlife, plants, fishing, agriculture, and so on.

Second, air quality: vehicles kick up fine particulate matter from road surfaces that reach deep into the lungs, and sweeping is one of the only tools cities have for reducing this non-exhaust pollution at the source.

Third, drainage and safety: clogged storm drains cause flooding, wet leaves create slip hazards, and in cold climates blocked drains mean water refreezes on roads overnight.

Fourth, it just makes the streets look tidier.

Yes, but it depends heavily on the equipment. Modern regenerative-air and vacuum sweepers genuinely work. A 2024 Toronto study found a regenerative-air sweeper removed 76% of thoracic-sized (<10μm) road dust on average, and well-run programs can cut stormwater pollutant loads by up to 80%. Here’s the study.

And here’s a good rundown comparing the three different types of sweepers from the Minnesota Water Resource Center.

Unfortunately…no. Most of the street sweepers currently in service in the U.S. are the older mechanical broom type. (Source) These are much better at moving visible debris than capturing fine particles, and they can genuinely push some material around rather than remove it. Scientific studies have generally been inconclusive.

Generally speaking, if your city has a modern vacuum sweeper instead of the mechanical sweeper, it’s more effectively cleaning the debris, including the smaller particles. If they’re still running 1980s-era mechanical brooms…then you might be out of luck.

Well, street sweeping tickets are among the most common parking citations issued in major U.S. cities. Last I checked, Lancaster gave out around 160,000 parking tickets in a year, and a large portion of those were sweeping tickets. New York City issued 2 million (!) street cleaning tickets last year. At ticket prices that could run around $45–65, that’d be $55 x 2 million tickets = a very substantial figure. So there’s definitely an incentive to keep it going. But cities like Lancaster are actually mandated to carry out street sweeping, due to the environmental regulations. So according to the Lancaster Parking Authority, they would prefer that drivers comply and move their cars.

As for cities that aren’t mandated, and are using outdated mechanical sweepers that don’t actually clean the streets? That’s another story and worth a follow up.