Duncan Town Of, AZ
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Duncan Town Of
Duncan Town Of serves about 605 people through 300 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 Greenlee County, Arizona. EPA system ID: AZ0406001; phone on file: 928-359-2791. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2024 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Duncan Town Of is 19 ppb across 6 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2024 | 0 (not detected) |
| 2024 | 3.5 ppb |
| 2023 | 19 ppb over 15 |
| 2020 | 3.8 ppb |
| 2019 | 2.3 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. Duncan Town Of's reported as 0 (not detected) sits at the 39th percentile in Arizona and the 24th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Greenlee County
4 other systems share Greenlee County; 3 of them have a higher latest lead result than Duncan Town Of. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Morenci Water Elec Co Main | 4,078 | 0.68 ppb |
| Morenci Water Elec Co Clifton | 1,680 | 1.4 ppb |
| Valley View Mhc & Rv Park | 142 | 0.7 ppb |
| Hunter Water - Town Of Duncan | 125 | 0 (not detected) |
Your move
Test your own tap with a certified lab first-draw sample; Duncan, 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 Duncan Town Of whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1600 ppb (copper action level 1,300 ppb).
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. More in what a past exceedance means today.