New Home Construction and Water Conservation in California: Efficiency vs. Moratoriums

In the face of California's ongoing drought, a central question for policymakers and homebuyers is whether new construction is part of the problem or the solution. Based on our experience assessment, newly built homes in California are significantly more water-efficient than older housing stock, with modern building codes leading to a 37% reduction in water use compared to homes built in 1990. However, the potential for local water connection moratoriums remains a critical risk that could impact housing supply and affordability. This article examines the data behind new home water efficiency and the economic implications of building restrictions.

How Do New Homes Compare to Older Homes in Water Usage?

Due to progressive updates to the California Building Standards Code, new construction incorporates high-efficiency fixtures and appliances that drastically reduce indoor water consumption. A standard three-bedroom home built in 2013 uses an average of 46,521 gallons of water annually. This represents a 21% decrease from homes built in 2009 and a 37% decrease from 1990 standards. Key efficiency improvements include:

• Low-Flow Toilets: Using an average of 1.28 gallons per flush compared to 1.6 gallons in older models.
• High-Efficiency Clothes Washers: Using approximately six gallons per cubic foot, a significant improvement over the 15 gallons used by standard washers from the early 1990s. These mandated improvements make the indoor water footprint of a new home substantially smaller from the day of purchase.

What is a Water Tap Moratorium and How Could It Impact Housing?

A water tap is the physical connection point that links a building to a municipal water system. A moratorium on new water taps prevents any new homes from being connected, effectively halting construction. In 2015, the state barred 22 primarily rural water districts from issuing new taps until they secured supplemental water sources. For homebuyers, a moratorium in a desired area means limited new housing inventory, which can drive up prices for existing homes. For the economy, the National Association of Home Builders estimates that building one single-family home creates three full-time jobs for a year, highlighting the broader economic impact of a construction slowdown.

What are Builders Doing to Further Reduce Outdoor Water Use?

While indoor water use is highly regulated, outdoor irrigation presents the next frontier for conservation. Builders are increasingly adopting drought-tolerant landscaping to minimize water needs. This involves replacing traditional turf lawns with rock, mulch, and native plants that require minimal watering. Furthermore, new homes are being designed with subterranean drip irrigation systems that deliver water directly to plant roots, reducing evaporation loss by up to 60% compared to traditional sprinklers. Some builders have eliminated front lawns entirely in their standard designs, a shift that aligns with state goals for long-term water sustainability.

Conclusion: Weighing the Evidence for Homebuyers and Policymakers

The data indicates that purchasing a newly built home is a water-conscious choice. The decision for local governments is more complex, balancing immediate water conservation needs against long-term economic and housing goals. For prospective homebuyers, understanding these dynamics is crucial.

• New homes offer inherent water efficiency, leading to lower utility bills and a reduced environmental footprint.
• Monitor local news for water district announcements, as moratoriums can arise quickly in areas with strained water supplies.
• When evaluating a property, consider the landscaping. Drought-tolerant yards not only conserve water but also offer lower maintenance costs.

The building industry's position is that it is part of the conservation solution. While the unprecedented nature of the current drought introduces uncertainty, the measurable efficiency gains in new construction provide a strong case against broad-brush moratoriums.