Desalination: Water water everywhere

by Conor Laing

After the floods in May and rains in October, it’s easy to forget that Texas was, not so long ago, in a serious drought.  In fact, the drought hasn’t ended and even when it does our state will still need to find the freshwater resources to meet the needs of a growing population and booming economy.  And we will have to do this while protecting the rivers, springs, and lakes that make our Texas a beautiful and healthy place to live.  We must remember that developing new water resources can be costly in many ways, and regulators and business must take steps to minimize those costs.

Earlier this year the Governor signed HB 2031, a bill that creates a legal framework for desalination plants, integrated with power plants to be constructed to turn Gulf Coast seawater into freshwater and for seawater to be regulated by the state.[1], [2]  Desalination is not going to solve all of Texas’s water shortage problems, but it’s hard not to look at the Gulf of Mexico and see an opportunity to expand water resources.  Desalination will be part of how we will get  water in the future.  At a Legislative committee hearing on the bill in March, everyone who testified, both for and against the bill, from the Sierra Club to the Texas Desalination Association, agreed that desalination should be part of how Texas secures water for its future.[3]

It is true that technological advances are making desalination more cost-effective and can be more environmentally friendly today than it has been in the past.  However, it is still expensive to desalinate water, especially sewater.  The Guadalupe-Blanco River Authority estimates that seawater desalination will cost $1 billion.[4]  The desalination process creates refuse with a high concentration of salt, which can be extremely bad for the immediate environment if it is not disposed of properly.  Desalination requires a great deal of energy, and producing energy requires water.  This means under most current power generation methods we will need to use freshwater resources and emit more pollution in order to desalinate seawater.

 So, before we all get too excited about the endless water supply in the Gulf, we need to take into account the costs of desalination. The Texas Commission on Environmental Quality (TCEQ), the state agency charged with implementation of this bill, should be mindful of all potential costs, as it formulates the regulatory framework for coastal desalination.  All those focusing on seawater desal, including both public and private sector interests, should consider all costs and take steps to minimize those costs.

HB 2031 is a necessary and important step in securing enough water for our Texas’s future.  We cannot, however, lose sight of the fact that desalination, if not implemented well, can hurt Texas economically and environmentally.  As desalination moves forward, future plant owners and state regulators must ensure desalination enhances rather than degrades our quality of life.

[1] Eva Hershaw, “Lawmakers Look to Gulf to Meet Water Needs,” The Texas Tribune, April 13, 2015, http://www.texastribune.org/2015/04/13/lawmakers-look-gulf-relieve-states-water-woes/.

[2]  “History for HB 2031,” Texas Legislature Online, June 17, 2015, http://www.capitol.state.tx.us/BillLookup/History.aspx?LegSess=84R&Bill=HB2031#vote111.

[3]Texas House of Representatives Committee on Natural Resources Hearing.

[4]Hershaw, “Lawmakers Look to Gulf to Meet Water Needs.”