Hillcrest Water Company, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 6 ppb (monitoring period 2026-2026). 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.
Who runs the water here
Hillcrest Water Company serves about 459 people through 205 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in La Paz County, Arizona. EPA system ID: AZ0415026; phone on file: 520-623-5172. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2025 (7 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Hillcrest Water Company is 12 ppb across 14 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 6 ppb |
| 2025 | 7 ppb |
| 2024 | 12 ppb over 10 |
| 2023 | 0 (not detected) |
| 2022 | 3 ppb |
| 2021 | 4 ppb |
| 2020 | 8 ppb |
| 2020 | 8 ppb |
| 2019 | 3.5 ppb |
| 2019 | 3.5 ppb |
| 2018 | 1.1 ppb |
| 2018 | 1.1 ppb |
| 2017 | 3.6 ppb |
| 2017 | 3.6 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. Hillcrest Water Company's 6 ppb sits at the 93rd percentile in Arizona and the 93rd nationally (higher means more lead).
Nearby utilities
18 other systems share La Paz County; 2 of them have a higher latest lead result than Hillcrest Water Company. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Quartzsite Town Of | 2,761 | 9.9 ppb |
| Epcor - Lakeside | 1,775 | 0 (not detected) |
| Epcor - Moovalya Keys | 1,298 | 6.2 ppb |
| Ehrenberg Improvement District | 989 | 1.5 ppb |
| Epcor - Holiday Harbor | 559 | 0 (not detected) |
| Epcor - Marina Village | 528 | 0 (not detected) |
| 88 Shades Rv Park | 488 | 0 (not detected) |
| Q Mountain Vista Mhp | 440 | 2.9 ppb |
| Epcor - Parker Dam | 429 | 0 (not detected) |
| Wenden Dwid | 360 | 0 (not detected) |
Next steps for Tucson, AZ
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 Hillcrest 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. Size matters more than most people expect: small vs large water systems.