Targeted home systems to remove PFAS more cost-effective than system-wide solutions

"The challenge with PFAS is that it's an insidious problem. It's everywhere, undetectable by our senses, and its health effects may not appear for decades," said Scott Lemos, senior lecturer at UNH's Peter T. Paul School of Business and Economics. "It is important to understand what consumers know and how much they are willing to pay to avoid potentially harmful exposure to PFAS, not just today but also years in the future."

In their study, published in the Journal of Water Resource Planning and Management, researchers found in the survey that households on public water systems are willing to pay an average of $156.84 annually ($13.07 on their monthly bills) to better protect themselves.

The study revealed that the average willingness to pay (WTP) falls short of covering municipal-level treatment costs and aligns more closely with the expenses of home water treatment systems, suggesting that system-wide PFAS treatments may not be appropriate on a local level, especially since PFAS contamination is more common in private wells.

"Instead of mandating an entire municipal water system to clean up the water, state and federal officials can test wells on a more localized basis in areas where PFAS pollution is a concern," said Lemos. "If there's a problem with the water in the well, subsidize a reverse osmosis filter."

Compared to the $156.84 annually WTP found in the study, an under-the-sink reverse osmosis filter costs approximately $500 and has a lifespan of around 10 years, resulting in an average annual cost of about $50, including maintenance, according to Lemos. When accounting for filter replacement and other upkeep, the yearly total cost is estimated at $100.

The survey also revealed higher willingness to pay among respondents who were younger, female, had children or expressed concerns about tap water safety.

PFAS (per- and polyfluoroalkyl substances) are manufactured chemicals used in industrial and consumer products. They have been linked to serious health issues like cancer, immune problems and reproductive issues, though their effects are still being studied. The chemicals gained attention in New Hampshire after contaminating drinking water wells at Pease Air Force Base in Portsmouth and the Saint-Gobain performance plastics plant in Merrimack.

Co-authors include John Halstead, UNH and Tristan Price, Maine Department of Environmental Protection.

Funding was provided by New Hampshire Agricultural Experiment Station.