Salt Lake City · 12 min read
What's Really in Salt Lake City's Tap Water
The city's own 2026 numbers, set beside the legal limit and the EPA's health goal.
By Mick Preston, Co-founder · June 2026 · Updated October 2026
Salt Lake City's own 2026 report lists no drinking water violations in 2025, and the numbers below sit under the legal limits. But a legal limit is not the same thing as a health goal: the EPA sets legally enforceable limits with treatment cost and technology in mind, and sets separate non-enforceable health goals, which are zero for arsenic and lead. This isn't an emergency. It's about knowing what is in your water over years of drinking it. Here are the city's numbers, and where your own plumbing changes the picture.
Where SLC water stands
Four results from the city's 2026 report where the legal limit and the EPA health goal differ or where households can act.
| Contaminant | In SLC's water | Legal limit (EPA) | EPA health goal |
|---|---|---|---|
| Trihalomethanes (TTHMs) | 36.71 ppb (range 11.77 to 75.57) | 80 ppb | No EPA goal set (n/a) |
| Haloacetic acids (HAA5) | 26.49 ppb (range 12.63 to 48.02) | 60 ppb | No EPA goal set (n/a) |
| Arsenic | Not detected at the plants; up to 1.2 ppb at one source | 10 ppb | 0 ppb |
| Lead (90th percentile, 2024 sampling) | 2.6 ppb | 15 ppb action level | 0 ppb |
Source: Salt Lake City Department of Public Utilities, 2026 Water Quality Report (Consumer Confidence Report, PWS UTAH 18026), downloadable below. Legal limits and health goals: EPA National Primary Drinking Water Regulations. Lead is reported as the 90th-percentile result of 53 homes sampled in 2024.
Read the city's full report and look up your own neighborhood's numbers.
Download SLC's 2026 report (PDF)Legal limit versus health goal
The EPA publishes two numbers for most contaminants. The legal limit (the MCL) is enforceable and is set as close to the health goal as is feasible, which means weighing treatment technology and cost alongside the science. The health goal (the MCLG) is a non-enforceable level based only on health risk. For arsenic and lead that goal is zero. Water at or under the legal limit is in compliance. Whether you want it lower at your own tap is a household decision, and that is what the rest of this page helps you weigh.
The four results, in detail
Trihalomethanes (TTHMs)
What it is. Four compounds (chloroform, bromodichloromethane, dibromochloromethane, bromoform) formed when the chlorine used to disinfect water reacts with organic matter. The city reports 36.71 ppb against the 80 ppb legal limit.
What the EPA says about health effects. The EPA lists the potential health effects of long-term exposure above the legal limit as liver, kidney or central nervous system problems and an increased risk of cancer.
Who's most at risk. Long-term drinkers of chlorinated water.
Bottom line. Under the legal limit. If you want less of it in the glass, a catalytic-carbon stage is one option aimed at chlorine byproducts, and a lab test of your own tap tells you where you stand.
Haloacetic acids (HAA5)
What it is. The five EPA-regulated haloacetic acids, another family of chlorination byproducts. The city reports 26.49 ppb against the 60 ppb legal limit.
What the EPA says about health effects. The EPA lists an increased risk of cancer as the potential effect of long-term exposure above the legal limit.
Who's most at risk. Long-term drinkers of chlorinated water.
Bottom line. Under the legal limit, and a byproduct of the treatment that keeps the supply disinfected.
Arsenic
What it is. A naturally occurring element that can leach into water from geology. The city reports none detected at its treatment plants and a range up to 1.2 ppb at one source, against the 10 ppb legal limit.
What the EPA says about health effects. The EPA lists skin damage, circulatory problems and an increased risk of cancer as potential effects of long-term exposure above the legal limit. Its health goal for arsenic is zero.
Who's most at risk. People drinking water with elevated arsenic for years, which is most relevant to private wells.
Bottom line. Well under the legal limit. If you are on a private well in Utah, test it. The city report does not cover you.
Lead
What it is. Lead rarely comes from the source water. It leaches from lead service lines and old solder, so it is an address-by-address plumbing problem. The city reports a 90th-percentile result of 2.6 ppb against the 15 ppb action level. In 2024 Salt Lake City announced a $39 million loan for a five-year lead service line planning and replacement project, and estimates 9,402 to 14,457 lead service lines.
What the EPA says about health effects. The EPA sets its health goal for lead at zero because there is no known safe level of exposure. It lists lower IQ, behavior and learning problems, slowed growth and anemia as effects in children, and notes that infants who consume mostly mixed formula can receive 40 to 60 percent of their lead exposure from drinking water.
Who's most at risk. Infants (especially formula-fed), young children and pregnant women, in homes with lead service lines or older plumbing (the EPA points to homes built before 1986).
Bottom line. The citywide number is under the action level, but your own plumbing decides your risk. Ask the utility about your service line and test the tap you use for formula.
The quick version
- The city's 2026 report lists no drinking water violations in 2025, and the four results above are under their legal limits.
- The chlorine byproducts (TTHMs and HAA5) come from the disinfection that keeps the supply safe from germs. They are present in most chlorinated systems.
- Lead is a household plumbing question. The EPA's health goal is zero, and the city estimates 9,402 to 14,457 lead service lines remain.
- The city report does not cover private wells, and it does not list PFAS. Check the PFAS guide and test if it matters to you.
- If you want less of these at your own tap, a multi-stage catalytic-carbon system is one option, and a lab test of your tap tells you whether you need one.
Find out what's in your water — and the system that handles it
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Sources
[1] Salt Lake City Department of Public Utilities, 2026 Water Quality Report (PDF above); more at slc.gov/utilities/water-quality.
[2] U.S. EPA, National Primary Drinking Water Regulations: legal limits, health goals and listed health effects for TTHMs, HAA5 and arsenic.
[3] U.S. EPA, Basic Information about Lead in Drinking Water: health goal of zero, effects on children, the 40 to 60 percent formula figure and pre-1986 homes.
[4] Salt Lake City Mayor's Office, Salt Lake City secures $39 million to replace lead service lines (March 25, 2024): the $39 million loan, five-year project and the 9,402 to 14,457 estimate.
This article is for education, not medical advice.