Twelve Paths to Managing Great Salt Lake Dust - and Why None Is Easy

Great Salt Lake has been losing water for decades. What it leaves behind is not just a visual marker of the West's water crisis - it is a public health problem taking shape in the wind. As lake levels fall and expose dried lakebed, sediments accumulated over generations of agricultural and industrial activity become vulnerable to erosion. Those sediments contain arsenic, selenium, and fine particulates. When conditions are right, the wind picks them up and carries them into Salt Lake City and surrounding communities.

The episode has been documented. The threat is real. What has been missing until now is a systematic, science-based accounting of what the state can actually do about it.

A study led by Kevin Perry, professor of atmospheric sciences at the University of Utah, supported by the Wilkes Center for Climate Science and Policy in collaboration with the Great Salt Lake Commissioner's Office, the Utah Division of Water Resources, and the Department of Environmental Quality, evaluates twelve distinct dust control strategies in detail. For each one, the analysis examines effectiveness, financial cost, water demand, maintenance requirements, and ecological impact. The result is not an endorsement of any single approach - it is a map of the territory that policymakers will have to navigate.

The Dust Problem Is Already Here

Dust from dried lakebeds carries a different risk profile than ordinary road dust or agricultural blowing. At Great Salt Lake, sediment accumulated in an enclosed basin has concentrated decades of runoff. Arsenic concentrations in lakebed soils can exceed safe thresholds, and fine particles small enough to penetrate deep into the lungs - PM2.5 and smaller - are prevalent in wind-blown playa dust.

Episodes that push air quality past federal National Ambient Air Quality Standards are not merely a public health nuisance. They carry regulatory consequences. If Utah fails to meet federal air quality standards repeatedly, it risks triggering federal intervention in land-use and transportation policy - a scenario with broad economic implications.

"We spent a year evaluating a broad range of potential dust control options for the Great Salt Lake," Perry said. "This analysis is not intended to endorse engineered solutions, but to provide policymakers with a comprehensive, science-based roadmap outlining the full spectrum of options should dust mitigation be determined necessary to protect public health."

Water-Based Options: Effective but Constrained

Several of the twelve strategies rely on water - shallow flooding of exposed playa, brine caps, or vegetation establishment through irrigation. These consistently rank among the more effective dust suppression methods. They also require sustained water input in a basin already under severe allocation pressure.

The consistent finding across water-based options is that they work but require a resource the region demonstrably lacks. Shallow flooding can stabilize large areas of exposed sediment effectively, but the water needed comes from the same sources already over-allocated across Utah's water system.

One of the study's more counterintuitive insights is that the most effective long-term dust suppression strategy does not require engineering the lakebed at all. Getting more water to Great Salt Lake through basin-wide conservation reduces exposed area and suppresses dust as a secondary benefit. This requires political will and regional cooperation on water allocation rather than technical infrastructure - which may be why it is also among the harder solutions to implement.

Non-Water Alternatives and Their Tradeoffs

For areas where flooding is infeasible - either because of water unavailability or terrain - the study evaluates non-water strategies including gravel cover, roughening the surface with tillage or windbreaks, and chemical surface stabilizers. These options vary considerably in effectiveness across different lakebed conditions and do not deliver the ecological co-benefits of restoration approaches. But they do not require water, which may make them the only viable option for significant portions of the exposed lakebed.

The study concludes that no single method is appropriate across all exposed areas. A portfolio approach - combining strategies matched to local lakebed conditions, water availability, and proximity to populated areas - is likely to produce the best balance of effectiveness, cost, and impact.

Lessons from California and the Cost of Delay

The study draws directly on precedents from the American West. At Owens Lake in California, the Los Angeles Department of Water and Power has spent over $2 billion since 1998 on dust control for a dried lakebed - one of the most expensive environmental mitigation projects in California history. Progress has been real but slow, and the ongoing costs are substantial.

The Salton Sea presents a different warning: decades of delay while the lake shrank and dust problems intensified have left California with a more expensive and politically difficult intervention challenge than earlier action would have produced.

Both cases illustrate the same point: inaction is not free. Waiting until federal air quality standards are repeatedly exceeded forces reactive, expensive responses. Early planning, even before crisis arrives, is less costly and provides more options.

Monitoring as a Prerequisite

One of the study's most actionable near-term recommendations is expanded air quality monitoring. Without data showing exactly when and where Great Salt Lake dust crosses federal thresholds, Utah risks spending money on mitigation before it's needed - or failing to respond until a crisis is already underway. The state has begun expanding its air quality monitoring network, which the researchers identify as a necessary first step before any major intervention is chosen.

"This report stems from the Wilkes Center's goal to put quantitative information at the fingertips of policymakers and the public," said John Lin, scientific director of the Wilkes Center. "Numerous potential dust control measures are available, including the nature-based solution to simply get more water to the Great Salt Lake, without costly human engineering. However, before any measure is adopted, we hope that science-driven information about the benefits and costs is carefully considered."

Great Salt Lake Commissioner Brian Steed described the study's practical value: "This dust study helps create a clearer picture of where dust events are occurring, what may be in the dust, and what tools we can utilize to mitigate risks."

The study is available through the Great Salt Lake Basin Integrated Plan, the Great Salt Lake Commissioner's Office, and the Wilkes Center for Climate Science and Policy. Its value is not in telling policymakers what to do - it is in ensuring that when decisions get made, they are informed by the full range of what is possible and what each option actually costs.