The potentiometric surface, or height of groundwater above mean sea level (MSL), is measured in wells throughout the District. One hundred sixty-seven of these wells are measured monthly and 70 wells are fitted with continuous recording instruments.

When groundwater levels are represented on a potentiometric surface map, the depth to the water table from land surface and the regional flow direction can be determined.

The District uses groundwater levels for evaluating long-term trends, detecting problem areas, and developing management strategies. This information is useful to geologic consultants, well drillers, water plant operators, farmers and the general public.

The District has three primary hydrogeologic units:

 View an Interactive Groundwater Level Map

The Floridan is a carbonate (limestone) aquifer that varies in degree of confinement but is continuous throughout the District. It is the primary source of  this area's drinking and irrigation water.