Well depths in Franklin County, Idaho
1,501 wells are on record with the state in Franklin County.Reported depths run from 18 to 1,005 feet, with a median of 201 feet.
Median depth
201 ft
18–1,005 ft across 1,087 records
Median depth to water
50 ft
0–806 ft across 1,331 records
Median yield
25 gpm
1–2,500 gpm across 1,048 records
What a well costs in Franklin County
A median-depth well, borehole only
$7,000–$12,000estimate
But depth is what drives the bill, and it varies. Across the range local wells actually hit — 73 to 441 ft — drilling runs $2,600–$26,500. That spread is the risk you are carrying when you make an offer, and it is why one quote is not enough.
- How this was worked out
- Median depth of 201 ft from 1,087 nearby well records, multiplied by a published statewide rate of $35-$60 per foot. Borehole only.
- Not included
- casing, pump and pressure tank, electrical and trenching, permits and site work
Rate from Well and Septic Cost in Rural Idaho (2026) (swagerbuilds.com, retrieved 2026-09-29). A published statewide figure, not a quote from this county — treat it as a starting point for a conversation with a licensed driller, not a price.
A county median will not tell you about your parcel
Groundwater changes over a few hundred feet. The useful number is what the wells nearest your parcel actually did — check the exact spot instead.
Check a Franklin County locationFree. No account.
What these numbers are based on
Idaho drillers must file a report for every well they complete, and the Idaho Department of Water Resources publishes them. The figures above come from 1,501Franklin County records retrieved on 2026-09-29.
Only 1,087 of those 1,501 records report a total depth, so the median is drawn from those. We do not fill the gaps.
Franklin County sits 20 of 44 Idaho counties by median well depth — deeper than the middle county, whose median is 188.5 ft. That comparison is a rough orientation, not a prediction: a single county can contain both 40 ft and 600 ft wells.
Records here span 1954 to 2026. Coverage is most complete from July 1987 onward; earlier wells are patchy and some were never reported at all.
How accurately are these wells located?
About 58% of located wells in Franklin County were placed from a section description — a 40-acre block or larger — rather than surveyed. For those, the true well could be several hundred feet from where the record puts it. That matters when you are asking what the nearest well did, and it is why our lookup labels every well with how it was located.
Who to talk to in Franklin County
Septic systems here are permitted by Southeastern Idaho Public Health (208-233-9080), not by the county. They decide what site evaluation a parcel needs. For water, get written per-foot quotes from at least two licensed Idaho drillers — the depth range above is why a single quote is not enough.
We do not yet publish verified local cost ranges for Franklin County. We would rather show nothing than pass off a national average as a local figure.
Before you buy
- Look up the specific parcel, not the county.
- Get two or more written per-foot drilling quotes.
- Ask Southeastern Idaho Public Health what septic evaluation is required.
- Have a title company confirm water rights and easements.
- Have boundaries and acreage confirmed by a licensed surveyor.