Oquirrh Mountain Water Co, UT
Lead detected, under the action levels
Latest 90th-percentile lead: 8.7 ppb (monitoring period 2023-2025). 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.
Who runs the water here
Oquirrh Mountain Water Co serves about 2,500 people through 759 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Tooele County, Utah. EPA system ID: UTAH23076; phone on file: 801-508-0397. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Oquirrh Mountain Water Co's lead record
That is down 3.4 ppb from 12.1 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Oquirrh Mountain Water Co is 12.1 ppb across 4 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 8.7 ppb |
| 2025 | 12.1 ppb over 10 |
| 2022 | 2.8 ppb |
| 2016 | 2.8 ppb |
How Oquirrh Mountain Water Co 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. Oquirrh Mountain Water Co's 8.7 ppb sits at the 96th percentile in Utah and the 96th nationally (higher means more lead).
Neighbouring systems
12 other systems share Tooele County; 0 of them have a higher latest lead result than Oquirrh Mountain Water Co. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tooele City Water System | 41,770 | 2.6 ppb |
| Grantsville City | 16,284 | 2.9 ppb |
| Stansbury Park Improvement District | 9,839 | 2.6 ppb |
| Wendover City Water System | 1,525 | 0.8 ppb |
| Erda Acres Water Co | 1,150 | 1.4 ppb |
| South Rim Water System | 834 | 1.1 ppb |
| Lincoln Culinary Water Assn | 660 | 1.3 ppb |
| Stockton Town Water System | 620 | 1.5 ppb |
| Dugway - English Village | 600 | 2.1 ppb |
| Vernon Waterworks Special Service Dist | 302 | 4 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Stansbury Park, 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 Oquirrh Mountain Water Co 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. The action level is dropping - the 10 ppb rule from 2027.