Mount Air Subdivision, UT
Lead detected, under the action levels
Latest 90th-percentile lead: 4.9 ppb (monitoring period 2026-2026). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Mount Air Subdivision at a glance
Mount Air Subdivision serves about 215 people through 96 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Salt Lake County, Utah. EPA system ID: UTAH18134; phone on file: 801-918-6024. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
That is down 7.3 ppb from 12.2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Mount Air Subdivision is 12.2 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 4.9 ppb |
| 2025 | 12.2 ppb over 10 |
| 2025 | 0 (not detected) |
| 2024 | 4.2 ppb |
How Mount Air Subdivision compares
Of the 521 Utah systems with a lead result, the median latest reading is 1.71 ppb; 8 are over 15 ppb right now and 27 have gone over at some point. Mount Air Subdivision's 4.9 ppb sits at the 87th percentile in Utah and the 90th nationally (higher means more lead).
Neighbouring systems
38 other systems share Salt Lake County; 8 of them have a higher latest lead result than Mount Air Subdivision. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Salt Lake City Water System | 383,612 | 2.51 ppb |
| Granger-Hunter Improvement District | 121,083 | 1.9 ppb |
| West Jordan City Water System | 117,025 | 2.5 ppb |
| Sandy City Water System | 99,750 | 2.92 ppb |
| Jordan Valley Wcd | 99,335 | 5.05 ppb |
| South Jordan City | 89,704 | 4.1 ppb |
| Taylorsville-Bennion Id | 67,098 | 3.3 ppb |
| Herriman City Municipal Water Department | 60,000 | 3.8 ppb |
| University Of Utah | 57,080 | 5.5 ppb |
| Kearns Improvement District | 56,700 | 1.3 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Sandy, UT may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Mount Air Subdivision whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. The lead result guide covers how utilities pick the homes they sample. Size matters more than most people expect: small vs large water systems.