Polk County, TN Water Table Trend
Polk County, TN: the closest actual trend
The closest qualifying well to Polk County is 27 miles away in Cherokee County, NC, where the trend runs holding roughly steady.
Polk County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Polk County's own number. If you own a well here, comparing your own depth log against this regional figure is worth doing before assuming either way. See Cherokee County, NC's full page. See the no-data guide for why a county this close to a qualifying well still doesn't get its own number.
Polk County, Tennessee in brief
About 18,338 people live across Polk County's 435 square miles, in Tennessee. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Polk County isn't one of them yet, see the methodology guide for the exact qualifying bar.