Carter County, MT Water Table Trend
What the closest monitoring well shows for Carter County
The closest qualifying well to Carter County is 51 miles away in Harding County, SD, where the trend runs declining at a typical pace for a declining county.
Carter County itself has no monitoring well with enough history to call its own trend, so treat this as a regional estimate, not Carter 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 Harding County, SD'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.
Carter County, Montana in brief
About 1,399 people live across Carter County's 3,340 square miles, in Montana. USGS's National Groundwater Monitoring Network covers 1,449 of 3,222 US counties (45%) today; Carter County isn't one of them yet, see the methodology guide for the exact qualifying bar.