Chester County, PA Water Table Trend
Chester County, PA: what the water table is actually doing
Chester County's long-term well puts the trend at 0.2 ft per decade, holding roughly steady, based on 291 measurements since 1951.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Chester County's source well, in detail
Depth to water at the last reading was 12.7 ft below land surface. Readings span 1951-08-24 to 2026-10-15, 291 measurements from USGS well USGS-395450075485401 (Ch 10 Chester 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 Chester County compares nationally
Chester County sits at rank 781st 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. Chester County, Pennsylvania is home to about 560,745 people. See the fastest-moving counties guide for how Chester 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 Chester 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.