Radon levels in Salt Lake City, Utah
ModerateEPA Zone 2Predicted long-term basement average of 2.2 pCi/L (model estimate) across the 14 modeled ZIP codes in Salt Lake City - about 1.2× the US average of 1.8, close to the Utah average of 2.3. Ranked #13 of 22 Utah cities on this site. Most of the city lies in Salt Lake County.
Test Salt Lake City, UT - the EPA says "consider fixing" in this range
The predicted basement average here is 2.2 pCi/L, in the 2-4 pCi/L band where the EPA recommends considering mitigation. Plenty of individual homes in a moderate area test above 4. Start with a short-term test; if it comes back at 2 or higher, follow up with a long-term test or a continuous monitor.
Already tested at 4 pCi/L or higher? Find a certified mitigation professional (EPA). A mitigation system typically runs $800-$2,500 installed.
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Predicted (model estimate). The pCi/L figures on this page are long-term area averages from a peer-reviewed national model built on millions of real radon tests (2001-2021). They describe the typical home in this area - not your home, which can be several times higher or lower. The EPA radon zone is a separate, 1993 county-level classification. How the numbers work.
2.2 ± 0.06
pCi/L predicted basement mean (model SD)
1.5 ± 0.07
pCi/L predicted upstairs (above-ground) mean
1.6-2.3
range of ZIP-level basement predictions in the city
0%
of Salt Lake City ZIPs predicted ≥ 4 pCi/L (79% ≥ 2)
What this means for Salt Lake City
The typical Salt Lake City home is predicted in the 2-4 pCi/L band. The EPA's guidance for this range is to consider fixing, because there is no known safe level and a meaningful minority of homes in a moderate area will test above 4.
The city figure is not a separate estimate: it is the mean of the model's ZIP-code predictions, weighted by the share of the city's land in each ZIP (Census 2020 ZCTA-to-place relationship file). The 1993 EPA zone (2) for Salt Lake and the 2001-2021 model agree here.
Comparable Utah cities: Draper (2.2), West Jordan (2.1), Murray (2.1), Saratoga Springs (2.1).
ZIP codes in Salt Lake City
ZIPs that overlap the city, largest share of its land first. Predicted basement and upstairs means are model estimates; ZIPs the model does not cover show a dash.
| ZIP | Share of city | Basement | Upstairs | Grade |
|---|---|---|---|---|
| 84116 | 34% | 2.2 ± 0.05 | 1.5 | Moderate |
| 84104 | 20% | 2.2 ± 0.05 | 1.4 | Moderate |
| 84103 | 18% | 2.2 ± 0.09 | 1.5 | Moderate |
| 84108 | 11% | 2.3 ± 0.05 | 2.0 | Moderate |
| 84105 | 3% | 2.2 ± 0.07 | 1.5 | Moderate |
| 84106 | 3% | 2.3 ± 0.07 | 1.4 | Moderate |
| 84044 | 2% | 1.6 ± 0.13 | 1.3 | Low |
| 84102 | 2% | 2.1 ± 0.06 | 1.2 | Moderate |
| 84101 | 2% | 2.1 ± 0.06 | 1.2 | Moderate |
| 84115 | 2% | 1.9 ± 0.07 | 1.4 | Low |
| 84109 | 2% | 1.7 ± 0.07 | 1.7 | Low |
| 84128 | 1% | 2.1 ± 0.06 | 1.0 | Moderate |
| 84111 | 1% | 2.1 ± 0.06 | 1.2 | Moderate |
| 84112 | 1% | 2.1 ± 0.06 | 1.0 | Moderate |
| 84113 | <1% | — | — | no model |
| 84114 | <1% | — | — | no model |
| 84138 | <1% | — | — | no model |
| 84150 | <1% | — | — | no model |
| 84180 | <1% | — | — | no model |
Testing help in Utah
Utah's radon program page is at deq.utah.gov and, when we checked it, offered a low-cost test kit ordered online. EPA state radon contacts page. If a test comes back at 4 pCi/L or higher, mitigation typically costs $800-$2,500 installed; use EPA find-a-professional and read the mitigation guide.
Salt Lake City radon questions
- Is radon high in Salt Lake City, Utah?
- Moderate. Averaging the model's ZIP-code predictions across Salt Lake City (weighted by how much of the city each ZIP covers) gives a long-term basement mean of 2.2 pCi/L - about 1.2× the US average of 1.8 and close to the Utah average of 2.3. That is in the 2-4 pCi/L range where the EPA says to consider fixing. Salt Lake City ranks 13 of 22 Utah cities on this site.
- Which Salt Lake City ZIP codes have the highest radon?
- Predictions for the 14 modeled ZIP codes in Salt Lake City range from 1.6 to 2.3 pCi/L in the basement. 0% of them are predicted at or above 4 pCi/L and 79% at or above 2. The city is fairly uniform, so the city-wide number is a reasonable guide for any neighborhood.
- Should I test for radon in Salt Lake City?
- Yes, soon. With a predicted basement average of 2.2 pCi/L, a meaningful share of Salt Lake City homes will test above the 4 pCi/L action level. Start with a short-term kit; if it reads 2 or higher, confirm with a long-term test or a continuous monitor before paying for mitigation.
- What does EPA Radon Zone 2 mean for Salt Lake City?
- Salt Lake City sits mainly in Salt Lake County, which the EPA classifies as Zone 2 - moderate potential (2-4 pCi/L). The zone map dates from 1993 and covers whole counties. The 2001-2021 model agrees with the zone for the city. Neither replaces a test of your own home.
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