Putnam County, IL Water Table Trend
What the closest monitoring well shows for Putnam County
The closest qualifying well to Putnam County is 12 miles away in Marshall County, IL, where the trend runs rising, getting shallower over time.
Putnam County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Putnam 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 Marshall County, IL'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.
Putnam County, Illinois in brief
About 5,633 people live across Putnam County's 160 square miles, in Illinois. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Putnam County isn't one of them yet, see the methodology guide for the exact qualifying bar.