Rio Vista Ranches, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 3.4 ppb (monitoring period 2024-2026). 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.
Rio Vista Ranches at a glance
Rio Vista Ranches serves about 59 people through 25 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Mohave County, Arizona. EPA system ID: AZ0408333; phone on file: 928-763-9400. 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 1.8 ppb from 1.6 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Rio Vista Ranches is 3.4 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3.4 ppb |
| 2025 | 1.6 ppb |
| 2019 | 0 (not detected) |
| 2016 | 0 (not detected) |
How Rio Vista Ranches 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. Rio Vista Ranches's 3.4 ppb sits at the 86th percentile in Arizona and the 84th nationally (higher means more lead).
Nearby utilities
49 other systems share Mohave County; 6 of them have a higher latest lead result than Rio Vista Ranches. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lake Havasu City Of | 54,610 | 3.1 ppb |
| Kingman Municipal Water | 45,000 | 0 (not detected) |
| Bullhead City Mohave | 36,330 | 0 (not detected) |
| Bermuda Water Company Inc | 25,000 | 5.6 ppb |
| Valley Pioneers Water Company Inc | 6,263 | 1.5 ppb |
| North Mohave Valley | 5,190 | 22 ppb |
| Epcor - Lake Havasu | 4,712 | 0 (not detected) |
| Golden Shores Water Company | 3,970 | 1.7 ppb |
| Golden Valley Improvement District | 3,950 | 0 (not detected) |
| Epcor - Willow Valley/King Street | 3,566 | 0 (not detected) |
Next steps for Bullhead City, AZ
Test your own tap with a certified lab first-draw sample; Bullhead City, 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 Rio Vista Ranches 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.