Rising water bills could become a new reality for households in drought‑prone cities, a recent Stanford‑led study warns, as hotter, drier conditions push utilities toward costly infrastructure upgrades.
Modeling Santa Cruz’s Future Water Needs
The research focused on Santa Cruz, California, a coastal community that currently relies almost entirely on local surface water and a single reservoir. Over the past twenty years, residents have cut water use by nearly two‑thirds, largely through conservation measures and reduced irrigation.
Lead author Jennifer Skerker, a PhD candidate in civil and environmental engineering, and her team built a computer model that combined projected temperature and rainfall trends with utility decisions such as constructing a wastewater‑reuse plant, setting water rates, and anticipating household demand.
One scenario tested the construction of a large desalination facility to treat seawater or brackish groundwater. While this would improve supply reliability, the model showed that household water bills would climb sharply.
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Another approach delayed major investments, keeping rates lower in the short term but leaving the system vulnerable; under that plan, reliable water would be available in only six of ten years on average.
Water scarcity looms.
Financial Implications for Residents
Projections indicate that median water bills in Santa Cruz could double by the middle of the century if the city pursues measures to guarantee supply. Under a dry‑climate scenario, the share of households spending more than the Environmental Protection Agency’s affordability threshold would rise from 19 percent to 35 percent.
The poorest families could see monthly costs jump from roughly $60 to $111 in today’s dollars. More than five percent of households might end up allocating as much as one‑third of their income to water, forcing difficult trade‑offs between basic needs.
“Climate change stresses water supplies, and forces utilities to build expensive new infrastructure to maintain reliability,” Skerker said in a press release. “In cities already struggling with affordability due to aging infrastructure, the additional costs passed on to ratepayers … can push a substantial share of households into crisis.”
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These findings echo a broader trend: the average cost of U.S. tap water has risen three times faster than inflation over the past two decades, driven largely by aging pipelines and postponed maintenance.
While the study centers on Santa Cruz, the researchers note that the modeling framework can be adapted for other municipalities such as Los Angeles, San Diego, San Francisco, Cape Town and Melbourne. Cities with larger reservoirs or interconnected water networks may face lower costs, yet the core tension—balancing reliability with affordability—remains.
From a policy perspective, the analysis suggests that state and federal assistance may become necessary to keep water both dependable and affordable, rather than placing the entire burden on local utilities and their customers.
As climate‑related pressures mount, the price of turning on the tap could become one of the most immediate ways households feel the impact of a warming world.
