Blair County, PA Water Table Trend
Blair County's groundwater trend, from USGS's own readings
Blair County's long-term well puts the trend at 1.3 ft per decade, rising, getting shallower over time, based on 267 measurements since 1969.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Blair County's source well, in detail
Depth to water at the last reading was 11.1 ft below land surface. Readings span 1969-06-25 to 2026-08-12, 267 measurements from USGS well USGS-402452078271301 (Ba 74 Blair County Observation Well), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Blair County compares nationally
Blair County sits at rank 189th of 1,449 ranked counties, ordered rising-to-declining, so a low number means a rising water table and a high one means fast decline. Blair County, Pennsylvania is home to about 120,269 people. See the fastest-moving counties guide for how Blair County stacks up against the most extreme cases nationally.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Blair County can be stable in depth and still worth testing for quality, or declining and still test clean, the two are measured separately, and only a direct test settles the second one.