Blog · September 28, 2026
Gravity Filter for an Off-Grid Parcel
Off-grid means you planned the water. It does not mean the ditch is safe.
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Why this comes up
Off-grid means you planned the water. It does not mean the ditch is safe. Use it on hauled or tested water. Say what the test found before you trust a claim on a box.
What to check on the map first
County GIS lines are assessment maps. They are not a survey, and a product will not redraw them.
Open Platbookmapper and choose the state. The directory sends you to the county viewer. Match the parcel ID before you trust a pin on an aerial photo.
A tool that matches the job
Shop the Big Berkey when that is the job in front of you. Use it on hauled or tested water. Say what the test found before you trust a claim on a box.
The limit
Filter water you hauled from a known tap, or water a lab has already tested. A steel crock does not make creek water safe.
Match the parcel ID on the tax bill before you shop for the field kit.
Not a survey. County GIS and tax parcel maps are assessment and planning layers. They are not a substitute for a recorded plat, deed, or licensed survey.