The Authority’s primary assignment is to develop and implement a strategy for complying with the Harris-Galveston Subsidence District’s Regulatory Plan that requires a reduction in groundwater usage.

The Subsidence District’s regulations require conversion to alternate water via a 30% reduction of groundwater usage by 2010, 60% by 2025, and 80% by 2035.

In addition to the cost of purchasing the surface water from the City of Houston, there are shared transmission, operations, and maintenance expenses to be paid. All of these factors, coupled with the cost of constructing the NHCRWA’s, 2025 water supply system, will impact the future cost of water.

See Projects for more information

subsidence HGSD regulatory area 3
30% reduction of groundwater usage by 2010
60% reduction of groundwater usage by 2025
80% reduction of groundwater usage by 2035