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San Francisco's downtown area is more contaminated with drug needles, garbage, and feces than some of the world's poorest slums

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San Francisco is one of the most exciting, dynamic, and richest cities in the world.

But it's far from being the cleanest.

In February, the NBC Bay Area Investigative Unit spent three days surveying 153 blocks of downtown San Francisco to see what they would find. Their search turned up drug needles, garbage, and feces in concentrations comparable to some of the world's poorest slums.

On a recent commute to Business Insider's office in San Francisco, I took a detour through the Tenderloin neighborhood, where NBC conducted its survey, to see how the claim held up.

NBC Bay Area hit the streets of the Tenderloin and the surrounding Mid-Market area — a neighborhood known for its mix of high-powered tech companies and homeless people.

tenderloin map
Google Maps

Read the full report from the NBC Bay Area Investigative Unit.

There, the city's chronically homeless denizens sleep outside the offices of Uber, Microsoft, Twitter, and Square. Almost half of the 7,500 homeless people in San Francisco live nearby.

uber headquarters sf
Eric Risberg/AP

NBC Bay Area surveyed the area bordered by Van Ness Avenue, Market Street, Post Street, and Grant Avenue in search of drug needles, trash, and feces. It kept track of the findings.

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Melia Robinson/Business Insider

The survey found trash littered across every block.

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Melia Robinson/Business Insider

"While some streets were littered with items as small as a candy wrapper, the vast majority of trash found included large heaps of garbage, food, and discarded junk," NBC Bay Area said.

Discarded needles were scattered across 41 blocks.

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Dr. Lee Riley, an infectious disease expert at UC Berkeley, told NBC Bay Area that getting stuck by a disposed needle can pass on viral diseases like HIV and hepatitis B and C.

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A whopping 91 blocks were dirtied with feces. The investigation found over 300 piles.

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When fecal matter dries, some particles become airborne and can spread potentially dangerous viruses, such as rotavirus. Inhaling those germs can be fatal, Riley said.

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In Los Angeles, an outbreak of hepatitis A has been linked to the city's 50,000 homeless people, who sometime defecate in the streets and spread the disease between tent cities.

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Source: Fox News

Riley, who authored a book titled "Slum Health," has researched conditions across the poorest slums of the world and examined the risk factors of living in extreme poverty.

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Melia Robinson/Business Insider

Based on the results of the NBC Bay Area survey, Riley said the contamination found in parts of San Francisco is "much greater than communities in Brazil or Kenya or India."

An aerial view of a slum in Caracas, Venezuela August 11, 2016. REUTERS/Carlos Garcia Rawlins
An aerial view of a slum in Caracas, Venezuela. Thomson Reuters

In some developing countries, slum dwellings often serve as long-term shelter for families. "There is an attempt to make the surroundings more livable," NBC Bay Area wrote.

slum manila phillipines
A mother walks her daughter to school at a slum area near Manila, Philippines. Ezra Acayan/Reuters

In San Francisco, city agencies clear out homeless encampments at a near constant rate.

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Melia Robinson/Business Insider

Those residents are forced to pack up their tents and belongings and relocate.

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Melia Robinson
Melia Robinson is a reporter at Business Insider covering how lawyers are changing how they work and bill in the age of artificial intelligence — and about the tech companies racing to serve them.Melia first joined Business Insider in 2013. She lives in New York City.