Sewers yield city drug portrait
Researchers dip into wastewater and come up with a "community urinalysis" for 10 locations.
Published August 22, 2007
WASHINGTON - Researchers have figured out how to give an entire community a drug test using just a teaspoon of wastewater from a city's sewer plant.
The test wouldn't be used to finger any single person as a drug user. But it would help federal law enforcement and other agencies track the spread of dangerous drugs, like methamphetamines, across the country.
Oregon State University scientists tested 10 unnamed American cities for remnants of drugs, both legal and illegal, from wastewater streams. They were able to show they could get a good snapshot of what people are taking.
"It's a community urinalysis," said Caleb Banta-Green, a University of Washington drug abuse researcher who was part of the Oregon State team. The scientists presented their results Tuesday at a meeting of the American Chemical Society in Boston.
Two federal agencies have taken samples from U.S. waterways to see if drug testing a whole city is doable, but they haven't gotten as far as the Oregon researchers.
One of the early results of the new study showed big differences in methamphetamine use city to city. One urban area with a gambling industry had meth levels more than five times higher than other cities. Yet methamphetamine levels were virtually nonexistent in some smaller Midwestern locales, said Jennifer Field, the lead researcher and a professor of environmental toxicology at Oregon State.
Field plans to start a survey for drugs in the wastewater of at least 40 Oregon communities.
The science behind the testing is simple. Nearly every drug - legal and illicit - that people take leaves the body. That waste goes into toilets and then into wastewater treatment plants.
"Wastewater facilities are wonderful places to understand what humans consume and excrete," Field said.
In the study presented Tuesday, one teaspoon of untreated sewage water from each of the cities was tested for 15 drugs. Field said researchers can't calculate how many people in a town are using drugs.
She said that one fairly affluent community scored low for illicit drugs except for cocaine. Cocaine and ecstasy tended to peak on weekends and drop on weekdays, she said, while methamphetamine and prescription drugs were steady throughout the week.
"We have so few indicators of current use," said Jane Maxwell of the Addiction Research Institute at the University of Texas, who wasn't part of the study. "This could be a very interesting new indicator."
David Murray, chief scientist for U.S. Office of National Drug Control Policy, said the idea interests his agency. He said the U.S. Environmental Protection Agency is testing federal wastewater samples just to see if that's a good method for monitoring drug use. He didn't know how many tests were conducted or where.
EPA assistant administrator Benjamin Grumbles said the agency is already looking at the problem of potential harm to rivers and lakes from legal pharmaceuticals.
The idea of testing on a citywide basis for drugs makes sense, as long as it doesn't violate people's privacy, said Tom Angell of the Students for Sensible Drug Policy, a Washington-based group that advocates legalizing most drugs. "This seems to be less offensive than individualized testing."
Tempest in a teaspoon
Most widespread: The ingredient Americans consume and excrete the most: caffeine.
Methamphetamine: One urban area with a gambling industry had meth levels more than five times higher than other cities. In some smaller Midwestern locales, methamphetamine levels were virtually nonexistent.
Overall drug use: The study suggests that a key tool currently used by drug abuse researchers - self-reported drug questionnaires - underestimates drug use.
Testing sites: Ten cities in the experiment ranged from 17,000 to 600,000 in population, but they were not identified. Lead researcher Jennifer Field said that could harm her relationship with sewage plant operators.