Charleston County, SC Water Table Trend
Charleston County, SC: what the water table is actually doing
Charleston County's long-term well puts the trend at 0 ft per decade, holding roughly steady, based on 178 measurements since 1982.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Charleston County's source well, in detail
Depth to water at the last reading was 15.3 ft below land surface. Readings span 1982-01-20 to 2026-08-31, 178 measurements from USGS well USGS-330247079340300 (Chn- 101), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Charleston County compares nationally
Charleston County sits at rank 637th 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. Charleston County, South Carolina is home to about 431,001 people. See the fastest-moving counties guide for how Charleston 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 Charleston 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.