Salt Lake City, Utah
Salt Lake City Water Quality
Mountain-stream water most of the year, harder well water added in summer, and no fluoride since May 2025. Here is what the city's 2025 data shows.
No 2025 violations · hardness 8.0–33.4 gpg by source · no added fluoride · lead 90th pct 2.6 ppb.
The short answer
Salt Lake City's water comes mainly from Wasatch canyon streams — City Creek, Parleys and the Cottonwoods — with wells and springs added in summer and water bought from two wholesale districts. The city reports no violations in 2025.
It is hard, from 8.0 grains per gallon (Big Cottonwood) to as much as 33.4 (some wells and springs), and the city has added no fluoride since May 7, 2025. Lead was 2.6 ppb at the 90th percentile in the 2024 sampling.
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Tell us your Salt Lake City address. We confirm coverage first, then schedule a licensed technician to test at your tap — no charge, no obligation.
What filtration does — and does not
Hardness is a softener problem; dissolved solids and taste are a filtration problem. Salt Lake City has both, in different amounts by season.
Where Salt Lake City water comes from
Sources named in the city's Water Quality Report 2026, covering 2025.
Wasatch canyon streams
City Creek, Parleys, Big Cottonwood and Little Cottonwood creeks, treated at the city's three water treatment plants. These are the base of the supply.
Wells and springs
Used as a supplement, mainly in summer when demand rises. They are the hardest and most mineral-rich water the city serves.
Wholesale districts
Water purchased from the Metropolitan Water District of Salt Lake & Sandy (Provo, Duchesne and Weber river water via Jordanelle and Deer Creek) and Jordan Valley Water Conservancy District.
What the 2025 data actually says
Limits are fixed. Results are source and system figures from the city's tables, not a reading at your tap.
Hardness depends on the source
Total hardness was 136 mg/L (8.0 gpg) from Big Cottonwood, 175 mg/L (10.2 gpg) from Parleys, 212 mg/L (12.4 gpg) from City Creek, and 154–571 mg/L (up to 33.4 gpg) from wells and springs.
No fluoride added
Salt Lake City stopped adding fluoride on May 7, 2025, under Utah House Bill 81. Natural fluoride now ranges from 0.0 to 0.28 mg/L, averaging 0.115 mg/L.
Disinfection byproducts
TTHM averaged 36.71 µg/L (range 11.77–75.57; limit 80). HAA5 averaged 26.49 µg/L (range 12.63–48.02; limit 60).
Lead: 90th percentile 2.6 ppb
In the 2024 triennial sampling of 53 homes, the 90th percentile was 2.6 ppb in the first liter and 2.2 ppb in the fifth. No first-liter sample exceeded the action level.
Well-water minerals
Wells and springs reported dissolved solids of 236–796 mg/L, sodium of 11–63.4 mg/L and nitrate from not detected to 4.35 mg/L (limit 10).
No violations in 2025
The city reports no drinking water violations for 2025. Chlorine residual averaged 0.64 mg/L, ranging from not detected to 1.44 mg/L.
Salt Lake City next to Los Angeles and Flagstaff
In Los Angeles, hardness depends on which treatment plant serves your neighborhood. In Salt Lake City it also depends on the time of year: the softest canyon water dominates most months, and the hardest wells and springs come on when summer demand rises.
Flagstaff is another high-elevation Western city that mixes surface water and groundwater, with its own utility report and its own numbers.
Where these figures come from
Everything on this page traces to Salt Lake City Department of Public Utilities' Water Quality Report 2026, which reports 2025 data.
- Salt Lake City Public Utilities — Water Quality Report 2026 (PDF)
- Service line material map: slc.gov/utilities/servicelinematerialmap. Lead questions: lead@slc.gov or 844-LEAD-SLC.
Matching treatment to the finding
Hardness that changes with the season is the usual reason Salt Lake City homeowners add treatment.
Softening — test first
Hardness ranges from about 8 to 33 grains per gallon depending on the source and season. A tap test in summer, when wells run, tells you the worst case before sizing a softener.
RO for drinking water
Reverse osmosis at the kitchen tap reduces the dissolved solids, sodium and nitrate that come with well water, and improves taste.
Carbon for chlorine taste
Chlorine residual averaged 0.64 mg/L. Activated carbon handles taste and odor at a pitcher, faucet or under-sink filter.
Fluoride is now a personal choice
With no fluoride added, families who want it rely on toothpaste or a dentist's advice. RO removes most natural fluoride too, which matters less now that the supply has very little.
How the free test works
A licensed technician tests at your kitchen tap, walks the plumbing, and tells you which of the findings above applies to your house and which does not. There is no charge and no obligation.
Seamless Home is the licensed contractor of record on the work that follows. Installation is performed by vetted installing partners engaged as our subcontractors, and the workmanship obligation stays with us. Coverage is confirmed per service area rather than promised as blanket availability.
What a water treatment job with us covers
Installation and replacement of whole-home and point-of-use treatment, specified against what your water actually contains.
Sediment filtration
Installation of the first stage that protects everything downstream of it, sized to the service line and the household draw.
Softening
Installation of ion-exchange softening where hardness is the problem, including the drain connection the plumbing code treats as indirect waste.
Carbon filtration
Installation of carbon stages for taste, odour and disinfection by-products, specified from your utility's own water quality report.
Reverse osmosis
Point-of-use installation at the kitchen sink where the target is dissolved solids rather than whole-home flow.
Disinfection
Installation of UV or equivalent treatment where the supply is a private well or is otherwise not continuously disinfected.
System replacement
Replacing equipment that has reached the end of its service life, including the discharge and air gap details an inspector looks at.
This is installation and replacement work, specified from a published water quality report or a test of your supply — not from a sales chart. Coverage is confirmed per service area rather than promised as blanket availability.
What the work actually looks like
Treatment equipment is plumbing. Most of the job is the connection, the drain and the code detail behind it.
Salt Lake City water, answered plainly
Where does Salt Lake City get its water?+
Mostly from Wasatch mountain streams — City Creek, Parleys, Big Cottonwood and Little Cottonwood creeks — treated at three city plants, supplemented in summer by wells and springs and by water bought from the Metropolitan Water District of Salt Lake & Sandy and Jordan Valley Water Conservancy District.
Is Salt Lake City water hard?+
Yes, and how hard depends on the source. The 2025 report lists 8.0 grains per gallon from Big Cottonwood, 10.2 from Parleys, 12.4 from City Creek, and up to 33.4 from wells and springs.
Does Salt Lake City add fluoride?+
Not since May 7, 2025. Utah House Bill 81 ended community water fluoridation. Natural fluoride in the supply averaged 0.115 mg/L in 2025.
Did Salt Lake City have any water quality violations?+
The city reports no violations for 2025.
Does Salt Lake City have lead service lines?+
The city publishes a service line material inventory map at slc.gov/utilities/servicelinematerialmap and reports more than $39 million in federal loan funding for lead service line replacement. Lead questions go to lead@slc.gov or 844-LEAD-SLC.
What are the lead results?+
In the 2024 triennial sampling of 53 homes, the 90th percentile was 2.6 ppb in the first liter and 2.2 ppb in the fifth liter, well under the 15 ppb action level.
Where do these figures come from?+
From Salt Lake City Department of Public Utilities' Water Quality Report 2026, which reports 2025 data. Third-party aggregators are not used.
Related resources
Home water purification and treatment
The national service page behind this one.
Learn more →Los Angeles water quality
LA Aqueduct and MWD imports, chloramine and hardness by source.
Learn more →Flagstaff water quality
A seasonal mix of Upper Lake Mary, springs and wells.
Learn more →Where a water softener can discharge
What to check before installing a softener.
Learn more →All home services
Water, battery, HVAC and solar under one licensed contractor of record.
Learn more →Get a free test at your tap
A licensed technician tests at your kitchen tap and tells you which findings apply to your house — hardness from your source, dissolved solids, or chlorine taste. No charge, no obligation, and coverage confirmed at your address first.
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