Madison County, MT Water Table Trend
The nearest real water-table reading to Madison County, MT
The closest qualifying well to Madison County is 39 miles away in Gallatin County, MT, where the trend runs holding roughly steady.
Madison County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Madison 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 Gallatin County, MT'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.
Madison County, Montana in brief
About 9,753 people live across Madison County's 3,588 square miles, in Montana. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Madison County isn't one of them yet, see the methodology guide for the exact qualifying bar.