Vegas saved 203B gallons ditching lawns, but surface temps rose 20°C
Las Vegas has successfully conserved billions of gallons of water by removing non-functional grass lawns, but the replacement with desert landscaping has caused a significant increase in local surface temperatures. Research indicates that the loss of evapotranspiration from grass contributes to a 20°C rise in surface heat during summer months.
Why it matters
It illustrates the complex trade-offs in urban planning between water conservation and the mitigation of the urban heat island effect.
A major effort to remove grass lawns across the Las Vegas Valley has saved 203 billion gallons of water, but environmental research shows that the large-scale change has also brought a serious rise in local surface temperatures. According to data from the Southern Nevada Water Authority’s Water Smart Landscapes Rebate programme, property owners across the metropolitan area have removed 250 million square feet of non-functional grass since 1999. The programme offers financial incentives of up to $5 per square foot to help residential and commercial property owners replace water-heavy lawns with desert landscaping and drip irrigation. The push gained legal backing after the Nevada Legislature passed Assembly Bill 356, alongside earlier laws including the Nevada Revised Statutes Water Conservation and Colorado River Act. The law requires decorative, non-functional grass to be removed from commercial properties, multi-family buildings, government sites and homeowners association properties across the region.
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