Oro Valley Water Utility, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 1 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
Oro Valley Water Utility serves about 42,316 people through 18,481 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Pima County, Arizona. EPA system ID: AZ0410164; phone on file: 520-229-5000. They can tell you what your service line is made of and whether they pay to replace it.
Oro Valley Water Utility's lead record
That is down 2.1 ppb from 3.1 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Oro Valley Water Utility is 3.1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 3.1 ppb |
| 2019 | 2.1 ppb |
| 2016 | 2.9 ppb |
Against other Arizona systems
Of the 730 Arizona systems with a lead result, the median latest reading is 0 ppb; 9 are over 15 ppb right now and 58 have gone over at some point. Oro Valley Water Utility's 1 ppb sits at the 76th percentile in Arizona and the 56th nationally (higher means more lead).
Other water systems in Pima County
137 other systems share Pima County; 27 of them have a higher latest lead result than Oro Valley Water Utility. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tucson City Of | 732,906 | 0.65 ppb |
| Metropolitan Dwid | 45,570 | 0.57 ppb |
| Community Wc Of Green Valley | 22,085 | 0 (not detected) |
| Usaf Davis Monthan Afb | 18,640 | 0 (not detected) |
| Sahuarita Water Company | 18,178 | 0 (not detected) |
| Vail Water Company | 17,500 | 0 (not detected) |
| Flowing Wells Irrigation District | 16,000 | 0 (not detected) |
| Marana Municipal - Marana | 15,162 | 0 (not detected) |
| Tucson Water Corona De Tucson | 10,217 | 0.78 ppb |
| Green Valley Dwid | 8,687 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Oro Valley, AZ 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 Oro Valley Water Utility 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.