Salt Lake City, Utah gets its drinking water from some of the best mountain sources in the West. The Salt Lake City Department of Public Utilities draws from Big Cottonwood, Little Cottonwood, Parleys, and City Creek canyons on the western slope of the Wasatch Range. The snowmelt-fed streams and reservoirs produce water that’s naturally clean and requires relatively light treatment.
For a city of 200,000 (metro area of 1.2 million), this mountain water is a remarkable asset. But Salt Lake City’s water story in 2026 is increasingly defined by what’s happening around the supply — not in it.
The Great Salt Lake Crisis
The Great Salt Lake has been shrinking for decades, losing roughly two-thirds of its water since 1850 and reaching record low levels in recent years. As the lake recedes, it exposes lakebed sediments that contain heavy metals — arsenic, mercury, antimony, and others — concentrated by decades of mining and industrial runoff.
When these sediments dry out, wind picks up the contaminated dust and deposits it across the Wasatch Front. This doesn’t directly contaminate the drinking water supply (the mountain watersheds are upslope and upwind), but it creates an air quality crisis that affects the broader environmental health of the region.
The lake’s decline also reflects the water budget reality: the rivers that feed the Great Salt Lake are the same rivers that supply Salt Lake City and surrounding communities. As population grows and climate shifts reduce snowpack, the competition between urban water demand and environmental flows intensifies.
Mining Legacy in the Canyons
Salt Lake City’s drinking water canyons have a mining history. Little Cottonwood Canyon and Big Cottonwood Canyon were mined for silver, lead, and zinc in the late 1800s and early 1900s. The remnants of those operations — tailings piles, abandoned mine adits, and acid mine drainage — still affect water quality in some canyon streams.
The city has invested heavily in watershed protection, including mine remediation projects. The Flagstaff Mine and other sites in the canyons have been stabilized to reduce metals leaching into drinking water tributaries. Monitoring shows that current metal levels in the finished drinking water are well within EPA standards.
But the contamination isn’t gone — it’s managed. A major storm event or landslide in a mined area could release a pulse of metals-laden sediment into the water supply. This risk is why Salt Lake City restricts public access to some canyon areas and maintains strict watershed protection rules (no dogs allowed in Big or Little Cottonwood, for example).
Snowpack and Climate Change
Salt Lake City’s water supply is tied directly to snowpack. The Wasatch Range receives heavy winter snow that melts gradually through spring and summer, providing steady water supply. But climate change is altering this pattern.
Warmer temperatures mean more precipitation falls as rain rather than snow, leading to earlier runoff and less water stored in the snowpack for summer. The city has experienced years where midsummer water supply becomes tight despite adequate annual precipitation — the timing is wrong.
Drought years are becoming more common. During the 2021-2022 drought, Utah implemented significant water restrictions and the Great Salt Lake hit historic lows. Salt Lake City’s reservoirs maintained adequate levels, but the margins were thin.
Growth and Demand
Utah’s population growth — particularly along the Wasatch Front — is among the highest in the nation. More people means more water demand at exactly the time that supply is becoming less reliable.
The city has pushed conservation hard, reducing per-capita water use significantly over the past two decades. But total demand continues to grow as the population increases. The Jordan Valley Water Conservancy District and other regional entities are exploring new supply options, including pipeline projects and water reuse.
What Residents Can Do
- Conserve aggressively. In the arid West, conservation isn’t optional. Utah residents use more water per capita than almost any other state — there’s room to improve.
- The water is good. SLC’s mountain supply is high quality. A basic carbon filter for chlorine taste is sufficient for most residents.
- Watch for air quality alerts. The Great Salt Lake dust issue is an air quality problem, not a water quality problem — but it affects your health nonetheless.
- Private well owners in Salt Lake County: Test for arsenic, TDS, and bacteria. Valley fill groundwater can have naturally elevated minerals.
- Support water policy. How Utah manages the Great Salt Lake, snowpack, and growth over the next decade will determine the region’s water future.
If you’re concerned about your water quality, a certified water treatment professional can test your water and advise on the right approach.
See also our coverage of Reno water quality and Colorado Springs water quality.
Sources: Salt Lake City Department of Public Utilities, Utah DEQ, EPA SDWIS, USGS, Salt Lake County Health Department