A simple single-problem treatment may start around the low four figures, while a multi-stage train for iron, sulfur, hardness and UV can reach several thousand dollars before installation. Spend on testing before spending on hardware.
Testing cost is part of the project
A proper well-water panel is small compared with the cost of buying the wrong treatment system. Tap Score and local accredited laboratories both fit this diagnostic step.
Iron and sulfur systems
Oxidation and media filtration systems commonly sit in the $1,000+ equipment class, with price rising for higher flow and combined contaminant treatment.
Softening and UV add stages
Hardness may require a separate softener, while bacterial risk can justify UV after upstream filtration. Each stage adds hardware, plumbing and maintenance.
Installation and site conditions
Well houses, pressure tanks, pipe sizes, electrical access and drain availability can materially change labor cost.