How GoOffGrid Works
The methodology behind the 0-100 off-grid score.
When you enter an address or GPS coordinates, GoOffGrid reads more than two dozen government and scientific data sources for that exact location, grades each reading, and returns a 0-100 score in about a minute. Here's what gets checked and where the data comes from.
- Water (25%). Can you reliably get drinking and household water here?
- Legal & access (20%). Can you reach the land, live on it off-grid, and get help and internet out there?
- Energy (15%). Will solar panels make enough power, and how hard is the house to heat and cool?
- Hazard (15%). How exposed is the land to floods, fire, quakes, and storms?
- Food (15%). Can you grow food: good soil, a long enough season, enough water?
- Buildability (10%). Is the ground flat and dry enough for a home and septic, at a fair land price?
The Six Dimensions
Every property is scored across six weighted dimensions. The weights reflect how often each factor kills an off-grid plan in practice. Water problems end more land purchases than anything else.
Water Access & Rights
25%Where household water would come from: rain on a roof, a well (what nearby government well records show, including whether wells in the area run salty or weak), and creeks or ponds nearby, plus how dependable the rain is from year to year and whether state water law limits a household well. Water is weighted heaviest because it's the most common deal-breaker for off-grid land.
Legal & Access
20%Road access and what the road is like, distance to emergency care, internet and cell coverage, and how built up the area is (more homes nearby usually means more local rules on lot size and livestock). We also warn you when a point falls on public or tribal land, and show county zoning where it is published, though zoning itself does not change the score.
Energy Potential
15%How much power solar panels would make on this land, through the year and in the darkest month, and how much energy it takes to heat and cool a house there.
Natural Hazard Risk
15%FEMA flood zones at and near the parcel, low coastal ground, wildfire hazard, earthquake shaking, tornado and hurricane history, and extreme heat.
Food Production
15%The growing season and summer warmth, soil quality, and water for crops.
Buildability
10%Slope, whether the ground suits a septic system, footing conditions such as frost depth and heavy clay, and local land prices.
The Scoring Method
Each reading earns part of its points on a sliding scale, and deal-breakers are listed on their own as warnings.
A reading does not simply pass or fail. Better readings earn more of their points, so a small difference in the land makes a small difference in the score instead of a cliff at one cutoff. Serious problems, such as a FEMA flood zone, cost more. When a source has no reading for a location, the gap is not held against the land, and each dimension shows a confidence rating (High, Moderate, or Low) so you can see where the data was thin.
Separately from the score, the engine raises risk flags for potential deal-breakers, marked Warning or Critical, so a single catastrophic issue can't hide inside an otherwise decent number.
What the Number Means
Every score comes with one plain verdict line:
- 95 and up: Strong Candidate
- 80 to 94: Good with Caveats
- 70 to 79: Significant Challenges
- 50 to 69: Major Concerns
- Under 50: Not Recommended
We set those lines by testing them against people, not against our own numbers. Two research panels judged 160 parcels without ever seeing our scores, and the lines sit where our scores best matched their verdicts.
Data Sources
Every score is built from public data, queried live for the exact coordinates you enter. Here are the sources behind each part of the score.
- USGS groundwater well records and state well-drilling records
- USGS brackish (salty) groundwater data
- State domestic well records: Maine Geological Survey; DNREC Division of Water (Delaware); New Hampshire Geological Survey, NHDES; MassDEP Well Location Viewer; Connecticut Department of Consumer Protection
- BC GWELLS well database (British Columbia)
- Provincial well records: Alberta Water Well Information Database (contains information licensed under the Open Government Licence – Alberta); Saskatchewan Water Security Agency (contains information licensed under the Government of Saskatchewan Standard Unrestricted Use Data Licence (Version 2.0)); Manitoba GWDrill (contains information from the Manitoba government, licensed under the OpenMB Information and Data Use Licence)
- Hawaii Commission on Water Resource Management well index
- PRISM 30-year rainfall normals (PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed September 2026)
- University of Hawaii Rainfall Atlas
- Open-Meteo climate history
- OpenStreetMap surface water (© OpenStreetMap contributors)
- FEMA National Flood Hazard Layer
- NOAA hurricane and tornado track records
- USGS earthquake hazard data
- US Forest Service Wildfire Hazard Potential
- MODIS satellite fire history (Canada)
- World Bank ThinkHazard
- USDA SSURGO soil survey
- SoilGrids (Canada)
- USGS 3DEP and Copernicus elevation
- NLR PVWatts (US)
- PVGIS (Canada)
- PRISM 30-year temperature normals (PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed September 2026)
- University of Hawaii Climate of Hawaii temperature maps
- Open-Meteo climate history
- NOAA U.S. Climate Normals 1991-2020 (frost dates at weather stations)
- OpenStreetMap road network (© OpenStreetMap contributors)
- CMS hospital data (US) and StatCan health facilities (Canada)
- FCC broadband data (US) and ISED broadband data (Canada)
- US Census housing counts
- USDA land values
- USGS PAD-US public land and Census tribal land
- County zoning maps where published (shown, not scored)
US and Canada Coverage
US properties get the deepest data coverage. Canadian properties are fully scored using Canada-specific sources (PVGIS solar, MODIS fire history, BC GWELLS wells, ISED internet, StatCan health facilities). Some Canadian data is thinner: a global soil map instead of a detailed soil survey, well depths only in British Columbia, and flood risk estimated from elevation, nearby water, and slope instead of mapped flood zones. A reading we could not get is not held against the land, and the confidence rating tells you which parts rest on less data.
US properties draw on the deepest data. Where a source runs thin, the score treats the missing reading as typical rather than good or bad, and the confidence rating says so. Read a Low confidence dimension as the first thing to check on the ground: a site visit, a well driller's call, or a soil test can move it either way.
What the Score Is and Isn't
The score is a screening tool that does not replace on-the-ground due diligence.
It tells you which properties deserve your due-diligence budget and which to walk away from. It does not replace a site visit, a test well, a survey, or a conversation with the county planning office. That's why the Property Report ends with a prioritized before-you-buy checklist: the specific things to verify on-site for that property, ordered by how likely they are to change your decision.
Off-Grid Score vs. Property Report
The free score shows the overall 0-100 number, its interpretation, and how many risk flags were found. The $23.70 Property Report unlocks the complete analysis: sub-scores for all six dimensions, every reading and what it cost the score, each risk flag explained with a recommended action, development cost estimates (well, septic, solar, road, land clearing), property-specific written analysis, the before-you-buy checklist, and a downloadable PDF. More questions? See the FAQ.
The Same Readings Feed the Homestead Plan
Screening answers whether to buy. Once the land is yours, the same six readings (rainfall, sun, soil, slope, hazards, frost) become the inputs to the Homestead Plan, a step-by-step build plan for that property: solar and battery sized for its leanest month, water catchment and tank size, growing area, septic screening, heat, buildings, and the build order with costs. It is $29.70 one time, or $14.70 if you bought the property's report.
See it on a real property
Enter any US or Canadian address and get its free 0-100 off-grid score across all six dimensions in about a minute.
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