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📌 Key Takeaway: Water softeners typically cost $1,200-$3,800 installed, basic whole-house filters $850-$1,400, under-sink reverse osmosis $300-$950 and whole-house RO $4,800-$8,000.
System Types at a Glance
Water Softeners
Removes calcium and magnesium that cause spotting and scale in pipes and appliances.
Whole-House Filtration
Carbon and sediment filters treat all water entering the home.
Reverse Osmosis (RO)
Removes a wide range of dissolved contaminants; most homes use it at the kitchen tap.
UV & Well Water Systems
UV disinfects bacteria; well systems combine filters for iron, sulfur and sediment.
2026 Water Treatment Price Snapshot
| System | Typical Installed Cost |
|---|---|
| Water testing | $100-$300 |
| Under-sink carbon filter | $180-$550 |
| Under-sink reverse osmosis | $300-$950 |
| UV purification | $350-$1,500 |
| Basic whole-house filter | $850-$1,400 |
| Water softener | $1,200-$3,800 |
| Whole-house filter + UV + softener | $2,650-$5,400 |
| Whole-house reverse osmosis | $4,800-$8,000 |
Test Before You Buy
The right system depends entirely on what is in your water. A lab test ($100-$300) shows hardness, contaminants and bacteria, so you only pay for treatment you actually need. City water customers can also check their utility's annual water quality report.
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Get Free Quotes →Frequently Asked Questions
Do I need a softener and a filter?
They solve different problems. Softeners remove hardness minerals; filters remove chlorine, sediment and other contaminants. Some homes need both.
How much does upkeep cost?
Softeners typically cost $10-$20 a month to run (salt and water). Filters and RO membranes need periodic replacement.
Can I install a system myself?
Under-sink filters are DIY-friendly. Whole-house systems usually need a plumber and sometimes a drain or electrical outlet.
🔎 How we research: The ServiCover Editorial Team compiles prices and guidance from published 2026 cost guides, manufacturer information and industry sources. Prices are national ranges and vary by location, home and provider, so always compare written quotes. We don't perform the work ourselves, and we may earn a commission when you request quotes through our partners — see our Advertiser Disclosure.