Q Mountain Vista Mhp, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 2.9 ppb (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. 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
Q Mountain Vista Mhp serves about 440 people through 220 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: AZ0415509. Ask the utility on your bill for your address in their service line inventory.
Every lead result on file
That is up 1.8 ppb from 1.1 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Q Mountain Vista Mhp is 9 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 2.9 ppb |
| 2022 | 1.1 ppb |
| 2019 | 9 ppb |
| 2016 | 0 (not detected) |
Against other Arizona systems
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. Q Mountain Vista Mhp's 2.9 ppb sits at the 84th percentile in Arizona and the 80th nationally (higher means more lead).
Other water systems in La Paz County
18 other systems share La Paz County; 3 of them have a higher latest lead result than Q Mountain Vista Mhp. 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) |
| Hillcrest Water Company | 459 | 6 ppb |
| Epcor - Parker Dam | 429 | 0 (not detected) |
| Wenden Dwid | 360 | 0 (not detected) |
Next steps for Quartzsite, AZ
Test your own tap with a certified lab first-draw sample; Quartzsite, 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 Q Mountain Vista Mhp 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. Systems that went over once often dip back under; here is what that means.