Hotter, drier weather threatens to double water bills in some US cities by midcentury, according to a study led by Stanford University. The research, published in Nature Sustainability, highlights how climate change, infrastructure investment, and household water demand can intensify an ongoing affordability crisis.
Lead author Jennifer Skerker, a Ph.D. student at the Stanford Doerr School of Sustainability, states, "Climate change stresses water supplies and forces utilities to build expensive new infrastructure to maintain reliability." As cities grapple with aging infrastructure, the additional costs could push many households into crisis.
Impact of Climate Change on Water Affordability
The average cost of tap water in the United States has surged three times faster than inflation over the past two decades. This increase is mainly due to deferred maintenance and aging infrastructure. The study reveals that climate change adds a new layer of pressure to these existing challenges.
In cities like Santa Cruz, California, which relies heavily on local surface water, the local utility has already implemented conservation measures. However, further infrastructure investments are necessary for climate resilience. The research team conducted a detailed analysis using data from Santa Cruz’s water department, linking future climate scenarios with utility adaptation strategies.
Projected Water Bills and Household Strain
The study predicts that measures taken to adapt to reduced water availability could nearly double median water bills in Santa Cruz by midcentury. Key findings include:
- Median water bills for the poorest residents could rise from around $60 to $111 per month.
- The share of households exceeding the EPA's recommended affordability threshold may jump from 19% to 35%.
- More than 5% of households could spend a third of their income on water.
These rising costs will likely force difficult trade-offs for families, impacting their ability to afford essentials like food and healthcare.
Diverse Infrastructure Strategies and Future Risks
The analysis shows that different infrastructure strategies yield varying outcomes. A risk-averse approach that invests in large desalination capacity early improves supply reliability but raises costs significantly. Conversely, a cautious strategy that delays investments keeps bills lower but risks supply reliability during droughts.
The modeling framework used in this study can also be adapted to assess water affordability risks in other vulnerable cities, including Los Angeles, San Diego, San Francisco, Cape Town, and Melbourne. Even cities currently perceived as resilient may face increasing vulnerabilities as climate stress escalates.
In conclusion, Sarah Fletcher, a senior author of the study, emphasizes the need for state and federal interventions: "Under today's financing and regulatory models, climate adaptation and water affordability are on a collision course. Ensuring reliable water access for everyone will require efforts beyond what individual utilities can accomplish alone."
🤖 This article was rewritten by Feed and Figures' editorial AI from a report originally published by Phys.org. Facts and quotes are preserved from the original; the rewrite focuses on clarity and structure. For the unedited original, see the source link below.
