How to Research Well Data on Any Property Before You Visit
Most western states maintain public well log databases showing depth, yield, and construction details for wells drilled near any parcel, and most buyers never check them before making an offer. Here's what it's actually looking at, and how to read it yourself if you want to dig deeper on a specific property.
The public record filed by the driller when a well goes in: depth, casing, lithology, yield, and the date drilled. Water quality usually isn't included and requires a separate lab test. GoOffGrid.tools pulls this data automatically for any US parcel and rolls it into a water access score.
Why well research matters before a site visit
A site visit costs a day, gas money, and sometimes a flight. Checking well data costs nothing and takes minutes, whether you pull it yourself or run a free GoOffGrid.tools score.
The reason it matters isn't abstract. A dry hole or a shallow yield doesn't just add cost, it can change whether the property works at all for what you're planning. Two parcels can look identical on a map and sit over completely different parts of the aquifer, with a well log twenty feet away showing 4 GPM and the parcel itself sitting over a formation that's produced nothing but dry holes. Better to know that before you fall in love with the view than after.
Where to find well log data by state
Most western states, including Colorado, Idaho, Montana, Arizona, and Washington, maintain a public well log database through the state water resources or natural resources department. Search by the parcel's address, tax parcel ID, or legal description. If the parcel itself has no log, check the surrounding parcels, since well depth and yield tend to be consistent within a local aquifer.
This is the same data GoOffGrid.tools pulls automatically and scores as part of water access. Doing it by hand is worth knowing how to do, especially if you want to sanity-check a report or dig into a specific parcel further, but it's the slower path.
Related: How Do You Get Water on Off-Grid Land?
How to read a well log
One thing a well log usually won't show: water quality. Arsenic, TDS, and bacteria testing is typically a separate step the buyer arranges after drilling, commonly $100-300 for a full private well panel. Arsenic above 10 ppb, the EPA's health-based limit for public systems and the standard benchmark used for private wells too, means budgeting for treatment. TDS above roughly 500 mg/L is an aesthetic guideline for taste, not a health-based limit.
What to do when there's no well on the property
Start with USGS groundwater data, which shows historical water levels by aquifer and tells you whether the regional water table is stable, rising, or declining, even for parcels that have never had a well drilled. GoOffGrid.tools factors this regional data in automatically when a specific well log isn't available.
If you want a parcel-specific estimate beyond the regional picture, call a local well driller. A five-minute conversation gets you a rough sense of expected depth and yield for that exact area, since drillers working a region regularly know its aquifer behavior firsthand. Budget $40-80 per foot drilled as a ballpark, with total depth ranging from under 100 feet to over 500 depending on the region.
What GoOffGrid.tools's water dimension scores
Water access and rights carries more weight in GoOffGrid.tools's viability score than any other category, 25% of the total, see the full breakdown on the Off-Grid Viability Index. GoOffGrid.tools pulls well log data, aquifer maps, water rights doctrine, and rainwater harvesting legality automatically for any US parcel and rolls them into a single water access sub-score, the same data covered above, without the manual lookup.
Related: Planning a Homestead: How Much Water You Actually Need on Rural Land
Water rights add a separate legal layer on top of the physical data, particularly in prior appropriation states where the right to use water doesn't automatically belong to whoever owns the land above it.
Run the score before you book the flight. If the water access rating comes back low, that's worth a phone call to a local driller before you spend a weekend on a site visit.
Related: Rural Land Due Diligence: 12 Questions to Answer Before You Make an Offer
FAQ
What's a good well yield for off-grid living?
Look for 3-5 GPM or better for a working homestead with irrigation and livestock.
What's a good well yield for off-grid living?
Look for 3-5 GPM or better for a working homestead with irrigation and livestock.
One GPM meets the standard minimum for a household well and produces 1,440 gallons a day running continuously, enough for basic household use only.
What is static water level and why does it matter?
It's the depth at which water sits in a well when it isn't being pumped.
What is static water level and why does it matter?
It's the depth at which water sits in a well when it isn't being pumped.
A shallower level means less energy to lift water, which matters for a solar-powered pump, while a deeper level needs a bigger, more power-hungry pump. Long-term reliability depends more on the aquifer's saturated thickness than on this number alone.
How do I check water access on rural land with no existing well?
Start with USGS groundwater data for the regional aquifer trend, which GoOffGrid.tools factors in automatically.
How do I check water access on rural land with no existing well?
Start with USGS groundwater data for the regional aquifer trend, which GoOffGrid.tools factors in automatically.
For a parcel-specific estimate, call a local well driller for a ballpark on depth and cost before you visit.
What else do I need to know about water beyond a well log?
A well log tells you what's likely underground, casing, construction date, and pump-test yield, but it usually doesn't include water quality.
What else do I need to know about water beyond a well log?
A well log tells you what's likely underground, casing, construction date, and pump-test yield, but it usually doesn't include water quality.
Arsenic, TDS, and bacteria testing is a separate step you arrange after drilling. Water rights determine whether you're legally allowed to use what you find, especially for any surface water on the property, and rainwater harvesting legality varies by state and can supplement a marginal well. GoOffGrid.tools rolls the physical and legal factors into one water access score.
Is there a tool that checks well data automatically?
Yes. GoOffGrid.tools pulls well log and aquifer data automatically for any US parcel's coordinates as part of its water access score, no manual database search required.
How much does water access affect a property's off-grid viability?
Water access and rights makes up 25% of GoOffGrid.tools's total viability score, more than any other single category, because a dry or unreliable well is the most common reason off-grid projects fail.
How much does water access affect a property's off-grid viability?
Water access and rights makes up 25% of GoOffGrid.tools's total viability score, more than any other single category, because a dry or unreliable well is the most common reason off-grid projects fail.
Full methodology on the Off-Grid Viability Index.
Check how water scores before you spend a weekend visiting a property with a dry well.
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