The upfront purchase price of a PFAS water filter is only one component of its true cost. Understanding total cost of ownership (TCO) over a 5- to 10-year period reveals the actual economics of different filtration approaches and often reverses intuitive rankings based on initial price.
Components of Total Cost
TCO for a water filtration system includes the initial system purchase, professional installation if required, periodic filter and membrane replacement consumables, electricity consumption (for RO pump systems or UV stages), water waste (for RO reject water), maintenance service visits, and eventual system replacement. For rental households, add moving costs if the system is removed at lease end.
Five-Year TCO Comparison
A $40 pitcher filter with $35 replacement filters every 2 months accumulates $2,350 in filter costs over 5 years plus the modest pitcher price — approximately $2,400 total. An under-sink carbon block system at $200 installed with $60 annual filter replacement costs $500 total over 5 years — less than 25% of the pitcher TCO at equivalent water quality. An under-sink RO system at $400 installed with $100 average annual ongoing costs totals $900 over 5 years — still far below the pitcher cost for equivalent drinking water volume.
Performance-Adjusted Value
TCO comparison is most meaningful when adjusted for performance consistency. RO provides the most reliable PFAS removal with no saturation concerns within rated intervals, making each gallon of filtered water more reliably PFAS-protected. Including the value of certainty in performance — knowing your filter is working as expected — justifies RO’s higher TCO relative to systems where performance varies based on PFAS mixture and contact time.