Can you live off-grid in Island County, Washington?
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Major concerns
Possible, but hard and costly. The U.S. Geological Survey maps strong earthquake shaking here, so build to the seismic code. Wells are shallow here, near 130 feet, which keeps drilling costs down. Solar is weaker here, about 3.7 hours of full sun a day, so plan a bigger battery bank or a generator.
What the land says
Rain
Rain helps, but plan on a well for most of your water and on watering the garden in dry months.
About 26 inches a year (PRISM, 1991 to 2020 average)
Wells
Shallow wells, so drilling should be one of the cheaper costs.
The typical well here is about 130 feet deep; a well typically runs $7,000 to $16,000
Growing season
Long enough for a spring and a fall garden.
About 259 frost-free days, USDA zone 9a; last frost about March 9, first about November 22
Sun
Weak sun. Solar needs a generator behind it in winter.
About 3.7 hours of full sun a day, averaged over the year
Flood
Flood zones run along creeks and rivers here. Look up the parcel on FEMA's flood map.
FEMA maps flood zones within a quarter mile across much of the county
Wildfire
Low wildfire risk.
U.S. Forest Service wildfire hazard map: Very Low to Low here
Storms
Hurricanes and strong tornadoes are rare here.
NOAA: no hurricane-strength storm within 50 miles since 1975; no strong (EF2 or stronger) tornado within 25 miles since 1990
Earthquakes
Strong shaking is possible. Build to the seismic code and brace the water tank.
USGS seismic hazard map: very high
Terrain
Rolling ground. Look for a flat house site.
Slopes average about 11%, about 140 feet above sea level
Soil
Good ground for a standard septic system. The county's soil test decides.
Loam, somewhat excessively drained (USDA soil survey). A standard system typically runs $5,000 to $10,000
Road
Paved roads are close by.
Nearest paved road usually within about 0.3 miles (OpenStreetMap)
Check a Washington parcel, or plan the one you own
Get a free 0-100 off-grid score.
A step-by-step build plan, sizing your solar, water, garden, septic, heat, and buildings.
Is it legal here?
Zoning
We found no public zoning map for Island County, so call the county planning office with the parcel number to ask whether the land is zoned.
Building code
Washington's State Building Code, which includes the International Residential Code for homes, is in effect in every county and city. Counties and cities enforce it, so a new house needs a building permit and inspections anywhere in the state, and a local change to the rules for homes needs State Building Code Council approval.
Rainwater
Collecting it is allowed.
Composting toilets
Allowed.
Water rights
Water belongs to whoever claimed it first. A new well or pond may need a state permit, and a creek may already be claimed.
Drilled to about 130 feet, with pump and pressure tank
Septic
$5,000 to $10,000
Standard system
Solar and batteries
$17,000 to $31,000
Sized for a modest household
Road or driveway
$3,000 to $9,000
From the nearest road to a house site
Clearing
$1,000 to $4,000
A house site, solar, and garden
Total
$33,000 to $70,000
Before the house
Before you make an offer on land here
Flood map
Look up the parcel on FEMA's flood map.
Flood zones run along creeks and rivers here. Building in one means flood insurance and extra permits.
Zoning
Call the county planning office with the parcel number.
There is no public zoning map, so we cannot tell whether the land is zoned.
Soil test
Get a soil test before you count on septic.
The county has to approve the ground before it issues a septic permit.
Nearby counties
86,267 people live in Island County, about 413.8 per square mile. It ranks tied for 29th of the 39 Washington counties we scored, and Washington ranks 44th of 50 states.