The most effective way to stop subsidence in our region is to reduce reliance on groundwater through groundwater regulation and convert to alternative water sources for our primary water supply. In areas where groundwater withdrawals have been reduced, subsidence rates have also been reduced. In areas that heavily rely on groundwater, subsidence rates continue to rise.
HGSD applies a science-based Regulatory Plan that establishes guidelines for groundwater withdrawals through a well-permitting process to reduce reliance on groundwater. The plan segments Harris and Galveston counties into three regulatory areas. Each area has conversion goals to reduce groundwater withdrawals to a specified percentage and to supply the majority of its water demand through alternative sources by a designated timeline. The plan uses a science-based adaptive management strategy that factors water demand and population growth, availability of alternative water supplies, subsidence modeling, and regulatory scenarios to determine conversion requirements.
The plan is regularly reviewed through a multi-agency effort called the Joint Regulatory Plan Review and is backed by the best available science to ensure its effectiveness in preventing further subsidence in Harris and Galveston counties.
Additionally, water conservation efforts help to further reduce reliance on groundwater. The District has several water conservation programs, including a grant program to fund local water conservation projects, a school program to educate our future water users and decision-makers, and a platform for water conservation tools, tips, and resources available online at smarteraboutwater.org.