Tucson Water Corona De Tucson, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 0.78 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.
About Tucson Water Corona De Tucson
Tucson Water Corona De Tucson serves about 10,217 people through 3,649 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: AZ0410169; phone on file: 520-837-2430. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Every lead result on file
Against the period ending 2024 (1.5 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Tucson Water Corona De Tucson is 1.5 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.78 ppb |
| 2024 | 1.5 ppb |
| 2021 | 1.23 ppb |
| 2019 | 1.23 ppb |
| 2018 | 1.4 ppb |
| 2016 | 1.4 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. Tucson Water Corona De Tucson's 0.78 ppb sits at the 73rd percentile in Arizona and the 47th nationally (higher means more lead).
Neighbouring systems
137 other systems share Pima County; 31 of them have a higher latest lead result than Tucson Water Corona De Tucson. 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) |
| Green Valley Dwid | 8,687 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Tucson, 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 Tucson Water Corona De Tucson 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.