Winnebago County, IA Water Table Trend
Winnebago County, IA: the closest actual trend
The closest qualifying well to Winnebago County is 21 miles away in Hancock County, IA, where the trend runs declining, slower than most declining counties.
Winnebago County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Winnebago 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 Hancock County, IA'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.
Winnebago County, Iowa in brief
About 10,383 people live across Winnebago County's 400 square miles, in Iowa. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Winnebago County isn't one of them yet, see the methodology guide for the exact qualifying bar.