The economics of PFAS treatment at the household level versus centralized municipal treatment involve fundamentally different cost structures, risk allocations, and equity implications. Understanding this comparison helps consumers and policymakers think clearly about the most cost-effective approach to ensuring PFAS-safe drinking water.
Household Treatment Economics
Individual household point-of-use systems treat approximately 1 to 2 gallons per day for drinking and cooking at a cost of $0.10 to $0.30 per gallon for certified systems amortized over 5 years. This unit cost is high relative to the full volume of water entering the home but reasonable relative to the specific use of treated water. The capital and operating cost burden falls entirely on individual households, creating inequity as lower-income households are less able to afford effective treatment.
Municipal Treatment Economics
Centralized treatment at water utilities benefits from economies of scale — treating millions of gallons per day with capital costs spread across a large ratepayer base. Per-gallon treatment costs for GAC at municipal scale are typically $0.001 to $0.003 per gallon — far lower than household filtration per gallon of total water treated. However, this treats all water uses (irrigation, toilet flushing, bathing) at drinking water quality, which is technically unnecessary. Rate increases for PFAS treatment vary from modest (a few dollars per month) at large utilities to significant (tens of dollars per month) at small systems.
The Complementary Role of Both Approaches
Centralized treatment and household filtration are not mutually exclusive — they address different aspects of the PFAS problem. Municipal treatment protects all residents without requiring individual action or resources. Household filtration provides an additional safety margin and protects residents on private wells outside the utility service area. The optimal policy approach invests in both, ensuring baseline protection for all while enabling individual households to achieve higher performance levels if desired.