A recent three-state survey from the University of Minnesota found that households are flushing medicines, cleaning, personal care products and more down their plumbing systems.
Households are flushing more organic material –
including medicines and cleaning and personal care products – down the drain
compared to historic data, according to researchers at the University of Minnesota’s
Water Resources Center (WRC).
The yearlong monitoring
of households in Colorado, Florida and Minnesota reinforces concerns that Americans
in general may be adding more household chemicals and pharmaceuticals to waste
This pilot study, done by the U of Minnesota's Water Resources
Center Onsite Sewage Treatment Program team and the Colorado School of Mines,
sampled the wastewater of 16 households in the three states for one year
beginning in fall 2006. By adding a mechanical diverter to the homes’ sewer,
researchers were able to sample water both seasonally and around the clock
during a seven-day period for each home.
In addition to an
increase in medicines and organic chemicals in the wastewater, researchers
found caffeine in all samples that were tested; salicylic acid (the active
compound in aspirin) was in about three quarters of samples, ibuprofen in half,
and detergent additives and plasticizers in more than three quarters.
Researchers also found that water use did not vary from season to season, but
was affected by the household’s age, with younger households using nearly twice
the amount of water per person than households with occupants 55 and older.
decrease in the amount of oil and grease flushed down the drain was found.
Concentrations of phosphates were also down, due to phosphate-free detergents
and household cleansers. The amount of nitrogen in household wastewater
remained the same.
“It’s a little like going through
someone’s trash can. You get a snapshot of what’s being used inside the home,”
said WRC research assistantJessica Wittwer, who was the
field sampler for Minnesota.
“While fewer households are flushing oils and grease down the drain, households
across the board are using more pharmaceuticals and stronger, anti-microbial
and nonbiodegradable cleansers. The concern with pharmaceuticals and
nonbiodegradable chemicals is their long-term effect on the larger ecosystem
and food chain.”
The Water Resource Center is
affiliated with the university’s College
of Food, Agricultural and Natural
Resource Sciences and University
of Minnesota Extension.
For more information, visitwrc.umn.edu.
University of Minnesota