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View Graph comparing the total cost of several water treatment methods over time.

15 Gallons of water per Week Normal Yearly Maintenance

Total cost and cumulative gallons of treated water used after:

Water Treatment Method 1 year (includes purchase price, if any)
780 gallons
5 years

3,900 gallons

10 years

7,800 gallons

20 years

15,600 gallons

40 years

31,200 gallons

Bottled water, 
You haul

$0.25 per gallon

No ongoing maintenance costs - haul and store it yourself  $195 $975 $1,950 $3,900 $7,800
Bottled water, delivered 

$1.00 per gallon
If you rent a dispenser that would be an additional $52 per year $780  $3,900  $7,800   $15,600  $31,200
Bottled water, delivered 

$1.50 per gallon

If you rent a dispenser that would be an additional $52 per year $1,170  $5,850  $11,700   $23,400  $46,800
High-end solid block carbon filtration system, 

$330 initial cost
Replace a $50 filter cartridge each year $330 $530 $780 $1,280  $2,280
Distillation

$0.30 per gallon
$250 initial cost
Periodically clean the distillation system $484  $1,420  $2,590  $5,180 $10,110
Mid-range Reverse Osmosis
$600 initial cost. 
If plastic, replace system after about 20 years
Replace the pre & post, filters and membranes periodically.  About $75 per year  $600  $900  $1,275 $2,025  $3,525
Popular pour-through "pitcher" filter

$30 initial cost
Replace pitcher after about 5 years
Replace $10 filter cartridge every 40 gallons $215  $985  $1,980  $3,970 $7,950
Plastic faucet mount, Solid carbon block filter

$30 initial cost
Replace entire filter after about 5 years
Replace $15 filter cartridge every 100 gallons $132 $585 $1,185 $2,325 $4,785