Oro Valley Water Countryside, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 0.5 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.
Oro Valley Water Countryside at a glance
Oro Valley Water Countryside serves about 6,031 people through 2,154 service connections, which makes it a medium-sized 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: AZ0410175; 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 Countryside's lead record
That is down 4.6 ppb from 5.1 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Oro Valley Water Countryside is 5.1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.5 ppb |
| 2022 | 5.1 ppb |
| 2019 | 1.2 ppb |
| 2016 | 0.63 ppb |
Where this result ranks
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 Countryside's 0.5 ppb sits at the 70th percentile in Arizona and the 43rd nationally (higher means more lead).
Other water systems in Pima County
137 other systems share Pima County; 37 of them have a higher latest lead result than Oro Valley Water Countryside. 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 |
| Oro Valley Water Utility | 42,316 | 1 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 |
Next steps for Oro Valley, AZ
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 Countryside 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. What a 90th-percentile result does and does not tell you: how to read a lead result. The action level is dropping - the 10 ppb rule from 2027.