Patagonia Water Department, AZ
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Who runs the water here
Patagonia Water Department serves about 819 people through 456 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Santa Cruz County, Arizona. EPA system ID: AZ0412006; phone on file: 520-604-0510. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Patagonia Water Department's lead record
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Patagonia Water Department is 5.1 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2022 | 0 (not detected) |
| 2019 | 5.1 ppb |
| 2018 | 3 ppb |
| 2017 | 4.8 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. Patagonia Water Department's reported as 0 (not detected) sits at the 41st percentile in Arizona and the 25th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Nearby utilities
15 other systems share Santa Cruz County; 4 of them have a higher latest lead result than Patagonia Water Department. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Nogales City Of | 22,000 | 0 (not detected) |
| Liberty Water Rio Rico | 17,960 | 0 (not detected) |
| Valle Verde Water Company - East | 2,397 | 0 (not detected) |
| Epcor - Tubac | 2,076 | 0 (not detected) |
| Baca Float Water Company | 1,162 | 0 (not detected) |
| Town & Country - Preston | 430 | 0 (not detected) |
| Kino Ranch 2 | 173 | 0 (not detected) |
| Sonoita Valley (South) Water Company | 172 | 8 ppb |
| The Grand Acres | 153 | 0 (not detected) |
| Avalon Gardens Water System | 100 | 0 (not detected) |
Your move
Look up your address in Patagonia Water Department's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Patagonia Water Department 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. Why sampled homes are the worst-case ones is in the guide to reading the number. A zero today does not rule out a jump later - the rules are tightening in 2027.