Granite Dells Water Company, AZ
Exceeded the action level in the past
Latest 90th-percentile lead: 10 ppb (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.
Who runs the water here
Granite Dells Water Company serves about 50 people through 12 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Yavapai County, Arizona. EPA system ID: AZ0413030; phone on file: 928-778-3081. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
That is up 4 ppb from 6 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Granite Dells Water Company is 19 ppb across 7 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 10 ppb |
| 2024 | 6 ppb |
| 2023 | 9 ppb |
| 2022 | 6 ppb |
| 2022 | 3.1 ppb |
| 2021 | 19 ppb over 15 |
| 2018 | 0 (not detected) |
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. Granite Dells Water Company's 10 ppb sits at the 96th percentile in Arizona and the 97th nationally (higher means more lead).
Nearby utilities
100 other systems share Yavapai County; 6 of them have a higher latest lead result than Granite Dells Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Town Of Prescott Valley | 57,048 | 0 (not detected) |
| Prescott City Of | 42,217 | 0 (not detected) |
| Cottonwood Municipal Water Cw1 | 11,288 | 0 (not detected) |
| Big Park Water Company | 7,392 | 0 (not detected) |
| Town Of Camp Verde Utilities | 5,380 | 0 (not detected) |
| Clarkdale Municipal Water System | 5,201 | 0 (not detected) |
| Cottonwood Municipal Water Vv6 | 4,518 | 18 ppb |
| Cordes Lakes Water Company | 4,425 | 4.1 ppb |
| Arizona Water Co - Rimrock | 3,532 | 0 (not detected) |
| Freeport Mcmoran Bagdad Town | 3,200 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Prescott, 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 Granite Dells Water Company 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. Why an old exceedance still matters: over the limit before, under it now.