Thurston County, WA Water Table Trend
Thurston County, WA: what the water table is actually doing
Thurston County's representative monitoring well shows depth to water holding roughly steady, a fitted trend of 0.1 ft per decade over 37 years of readings.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Thurston County's source well, in detail
Depth to water at the last reading was 40.2 ft below land surface. Readings span 1988-07-30 to 2025-08-18, 6 measurements from USGS well USGS-465927122492101 (17n/01w-05h02 Su-001), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Thurston County compares nationally
Thurston County sits at rank 754th 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. Thurston County, Washington is home to about 302,912 people. See the fastest-moving counties guide for how Thurston County stacks up against the most extreme cases nationally.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Thurston 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.