Walla Walla County, WA Water Table Trend
Walla Walla County, WA: what the water table is actually doing
Walla Walla County's representative monitoring well shows depth to water declining faster than most declining counties, a fitted trend of 7 ft per decade over 114 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Walla Walla County's source well, in detail
Depth to water at the last reading was 83 ft below land surface. Readings span 1910-02-01 to 2024-02-07, 17 measurements from USGS well USGS-460127118215202 (06n/36e-06m01), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Walla Walla County compares nationally
Walla Walla County sits at rank 1352nd 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. Walla Walla County, Washington is home to about 62,068 people. See the fastest-moving counties guide for how Walla Walla County stacks up against the most extreme cases nationally.
If you own a well in Walla Walla County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Walla Walla County, that trend is real, not assumed: 7 ft per decade over 114 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Walla Walla 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.