Climate change may double urban water bills by 2050, according to a new study published in Nature Sustainability on July 8, 2026, highlighting the growing financial burden climate change could place on households. The research is the first to comprehensively examine how climate change, aging water infrastructure, utility investment decisions, and changing household water demand interact to affect water affordability. Using Santa Cruz, California, as a case study, researchers found that adapting to worsening water scarcity could nearly double median household water bills by mid-century.

The findings also show that low-income families will bear the greatest burden, with the proportion of households facing unaffordable water costs potentially rising from 19% today to as high as 35% under severe climate scenarios. The study warns that cities worldwide must plan not only for reliable water supplies but also for affordable access.

Rising Climate Risks Could Increase Household Costs

Researchers found that climate change may double urban water bills by 2050 as utilities invest in expensive infrastructure to secure reliable water supplies during prolonged droughts.

Santa Cruz, which relies on limited local water resources, has already implemented many low-cost conservation measures. Future water security would likely depend on major investments such as desalination plants or advanced wastewater recycling systems, both of which carry significant construction and operating costs.

Under the study’s most severe climate scenario, the median monthly water bill for the city’s lowest-income households could increase from approximately $60 to $111.

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Low-Income Families Face the Greatest Burden

The report warns that rising water costs will disproportionately affect vulnerable households.

• In the driest climate scenario, more than 5% of households could spend nearly one-third of their income on water bills, forcing many families to make difficult choices between paying for water, food, healthcare, housing, and other essential expenses.
• Researchers argue that water affordability should become a central consideration in future climate adaptation planning rather than focusing solely on maintaining reliable supplies.

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Infrastructure Investments Present Difficult Choices

The study highlights the trade-offs cities face when preparing for climate change.

• Building large desalination facilities early would improve water security during droughts but substantially increase household water bills.
• Delaying these investments could reduce short-term financial pressures but increase the risk of water shortages during future dry periods.
• Meanwhile, the cost of tap water in the United States has already been rising three times faster than inflation over the past two decades due to aging infrastructure, deferred maintenance, and growing investment needs.

Climate change is expected to accelerate these trends as rising temperatures and changing rainfall patterns make droughts more frequent and severe.

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Lessons for Other Climate-Vulnerable Cities

Although the research focused on Santa Cruz, the modeling framework can be applied to several other cities facing similar water challenges, including Los Angeles, San Diego, San Francisco, Cape Town, South Africa, and Melbourne, Australia

Cape Town narrowly avoided its widely publicized “Day Zero” water crisis in 2018 after strict water rationing limited residents to 50 liters per person per day.

Meanwhile, Melbourne’s reservoirs declined by 111 billion liters between March and June 2026, reflecting prolonged drought, record-low inflows, and increasing water demand.

These examples demonstrate how climate change is placing growing pressure on urban water systems worldwide.

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