Barnwell County, SC Water Table Trend
Is the water table dropping in Barnwell County, SC?
Barnwell County's long-term well puts the trend at 1.6 ft per decade, declining at a typical pace for a declining county, based on 60 measurements since 1987.
This is one representative well, not a county-wide survey, the same grain limit every page here discloses.
Barnwell County's source well, in detail
Depth to water at the last reading was 33 ft below land surface. Readings span 1987-09-24 to 2025-09-05, 60 measurements from USGS well USGS-331039081184201 (Bw- 350), part of the National Water Information System. The qualifying bar and the OLS fit behind this trend are documented in the methodology guide.
How Barnwell County compares nationally
Barnwell County sits at rank 1153rd 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. Barnwell County, South Carolina is home to about 20,495 people. See the fastest-moving counties guide for how Barnwell County stacks up against the most extreme cases nationally.
If you own a well in Barnwell County
A dropping water table means a residential pump has to reach deeper and work harder, which shortens its life. In Barnwell County, that trend is real, not assumed: 1.6 ft per decade over 38 years.
Depth and quality are separate questions
This page answers a depth question, not a quality one. A well in Barnwell 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.