Mason County, WA Water Table Trend
Mason County's groundwater trend, from USGS's own readings
Mason County's long-term well puts the trend at 0.3 ft per decade, holding roughly steady, based on 15 measurements since 1961.
One well stands in for Mason County's whole aquifer here, the honest simplification every page on this site carries.
What the well actually measured
The most recent reading put water 7.4 ft below land surface. Readings span 1961-04-17 to 2018-09-25, 15 measurements from USGS well USGS-472235122495901 (22n/01w-20p01), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
Where Mason County ranks
Of the 1,449 US counties with a usable trend, Mason County ranks 423rd from fastest-rising to fastest-declining, 1 is the fastest-rising water table measured, 1449 the fastest-declining. About 69,632 people live in Mason County, Washington. See the fastest-moving counties guide for how Mason County stacks up against the most extreme cases nationally.
A dropping table says nothing about water quality
Whether Mason County's water table is rising or falling is independent of what's actually in the water. Depletion can concentrate naturally-occurring minerals, so it's worth checking directly with a water test rather than assuming a depth trend says anything about quality.