Bonneville County, ID Water Table Trend
Bonneville County, ID: what the water table is actually doing
Over 76 years of USGS readings, the well tracking Bonneville County's aquifer is declining at a typical pace for a declining county: 2.8 ft per decade.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Bonneville County's source well, in detail
Depth to water at the last reading was 601.7 ft below land surface. Readings span 1950-09-08 to 2026-09-08, 487 measurements from USGS well USGS-433218112191601 (02n 35e 02bbc1 Highway 1c), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Bonneville County compares nationally
Bonneville County sits at rank 1236th of 1,449 ranked counties, ordered rising-to-declining, so a low number means a rising water table and a high one means fast decline. Bonneville County, Idaho is home to about 133,644 people. See the fastest-moving counties guide for how Bonneville County stacks up against the most extreme cases nationally.
If you own a well in Bonneville County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Bonneville County, that trend is real, not assumed: 2.8 ft per decade over 76 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Bonneville County can be stable in depth and still worth testing for quality, or declining and still test clean, the two are measured separately, and only a direct test settles the second one.