On October 12, 2009, the Washington State Department of Ecology issued an Interpretive Policy Statement clarifying that a water right is not required for rooftop rainwater harvesting. Up to that point it was a gigantic hassle to get a permit.
Water on Lummi Island may be as iffy as the ferry. No one seems to know the extent of our aquifers. One supposes that our well supply is rainwater soaking into the recharge areas and dripping down through the rocks. The east side seems to have a more reliable supply than the west side.
If you are worried about water at all you ought to consider harvesting some of that free rainwater. At least set up a rain barrel or two (handy for that first rinse of veggies from the garden). Large tanks go for about $.50 per gallon of capacity. Much cheaper than drilling a well.
Since October 12, several islanders have installed 2500 rainwater collection tanks. The water can be used for irrigation or hooked up to your domestic water system.
Jamison Construction installed ours. Charlie Nielsen handled the excavation and water lines. Tom Scott has been involved in the potable water systems. Others have installed their own systems.
Our two tanks, installed in November, are full. 5000 gallons of water available for the garden or for water emergencies.