Graham County Utilities-Fort Thomas, AZ
Above the federal action level
Latest 90th-percentile lead: 32 ppb (monitoring period 2025-2027). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. In the most recent monitoring period, more than 10% of the sampled homes measured above 15 ppb. Use a filter certified to NSF/ANSI 53 for lead for drinking and cooking now, and test your own tap.
Who runs the water here
Graham County Utilities-Fort Thomas serves about 452 people through 187 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Graham County, Arizona. EPA system ID: AZ0405001; phone on file: 928-485-2451. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2026 (32 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Graham County Utilities-Fort Thomas is 32 ppb across 11 monitoring periods, 3 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2027 | 32 ppb over 15 |
| 2026 | 32 ppb over 15 |
| 2026 | 5.6 ppb |
| 2025 | 32 ppb over 15 |
| 2024 | 0 (not detected) |
| 2023 | 0 (not detected) |
| 2021 | 0 (not detected) |
| 2020 | 0 (not detected) |
| 2018 | 0 (not detected) |
| 2017 | 0 (not detected) |
| 2017 | 0 (not detected) |
How Graham County Utilities-Fort Thomas compares
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. Graham County Utilities-Fort Thomas's 32 ppb sits at the 100th percentile in Arizona and the 100th nationally (higher means more lead).
Other water systems in Graham County
6 other systems share Graham County; 0 of them have a higher latest lead result than Graham County Utilities-Fort Thomas. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Safford City Of | 20,600 | 0 (not detected) |
| Graham County Utilities - Pima | 3,899 | 0 (not detected) |
| Usdj Fbp Fed Corr Inst Safford | 949 | 5.7 ppb |
| Adoc Aspc Fort Grant | 800 | 9.5 ppb |
| Eden Water Company Inc | 400 | 0.9 ppb |
| Ash Creek Water Company | 310 | 0 (not detected) |
Next steps for Pima, AZ
Use a filter certified to NSF/ANSI 53 for lead on the tap you drink and cook from, now, before you test. Then test your own tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Graham County Utilities-Fort Thomas 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. Systems that went over once often dip back under; here is what that means.