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Village hearing: draft 20-year water supply plan finds adequate supply but flags PFAS at Well 6
Summary
Engineers told the Village of Hartland that the utility has sufficient supply and storage through 2045, but sampling shows per- and polyfluoroalkyl substances (PFAS) at Well 6 slightly above a forthcoming 4 parts-per-trillion standard; staff are evaluating filtration and dilution options.
At a public hearing, village staff and consultants presented a draft 20-year water supply service area plan concluding that the Village of Hartland has sufficient water supply and storage to meet projected demand through 2045, but that one well has PFAS concentrations near a forthcoming regulatory limit.
Consultant David Arnott summarized the plan, saying the village’s projected 2045 peak-day demand is about 2,770,000 gallons per day and that the village’s current reliable supply is about 3,510,000 gallons per day. “You have enough water supply for the foreseeable future as development happens,” he said.
The presentation noted elevated concerns only at Well 6 with PFAS measurements near the level expected under updated standards. Sample results discussed by staff included a measurement of 4.1 parts per trillion in one sampling event and a later sample at 3.8 parts per trillion; staff said the forthcoming standard will be 4 parts per trillion for two primary PFAS compounds.
Consultants and staff said options under evaluation include point-of-use or point-of-well filtration systems using specialty media, and drilling a test/deeper well to dilute the PFAS concentration. Staff said filtration media systems are in use in other municipalities and that treating only a portion of the well’s throughput could reduce costs.
The board opened and closed a public hearing on the draft plan; no members of the public spoke during the hearing.
Staff said they will continue to work with suppliers and the Wisconsin Department of Natural Resources to refine solutions for Well 6 and will return to the board with recommendations if treatment or additional action becomes necessary. The draft plan itself will guide water-supply planning and capital investments over the coming two decades.
