Can you live off-grid in Wahkiakum County, Washington?
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Significant challenges
Possible, but the steep ground will be hard. The ground is steep, with slopes averaging about 26%. That raises the cost of a driveway, septic, and foundation. Water is easy here, with about 110 inches of rain a year and wells near 90 feet. The U.S. Geological Survey maps strong earthquake shaking here, so build to the seismic code.
What the land says
Rain
Rain can supply much of a household's water with a large tank. A garden mostly waters itself in normal years.
About 110 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 90 feet deep; a well typically runs $6,000 to $13,000
Growing season
A full season for most vegetables.
About 195 frost-free days, USDA zone 9a; last frost about April 21, first about November 3
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 are rare here. Still, look up the parcel on FEMA's flood map.
FEMA maps no flood zones nearby
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
Steep. A flat house site and a driveway route will drive the cost.
Slopes average about 26%, about 1,210 feet above sea level
Soil
Expect a costlier septic system, because the ground is steep. The county's soil test decides.
Silt loam, well drained (USDA soil survey). A mound, sand filter, or treatment unit typically runs $10,000 to $20,000
Road
Dirt tracks. Plan to build or maintain your own road.
Nearest road often a dirt track, about 0.8 miles away (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 Wahkiakum 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 90 feet, with pump and pressure tank
Septic
$10,000 to $20,000
Mound, sand filter, or treatment unit
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
$36,000 to $77,000
Before the house
Before you make an offer on land here
Soil test
Get a soil test before you count on septic.
Steep ground can rule out a standard system.
Road access
Confirm a recorded easement to the parcel.
The nearest roads are often dirt tracks.
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.
Nearby counties
4,765 people live in Wahkiakum County, about 18.1 per square mile. It ranks tied for 18th of the 39 Washington counties we scored, and Washington ranks 44th of 50 states.