Far Horizons Mhp, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 7 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
Far Horizons Mhp serves about 258 people through 199 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Pima County, Arizona. EPA system ID: AZ0420042; phone on file: 520-323-7471. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is up 7 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Far Horizons Mhp is 7 ppb across 11 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 7 ppb |
| 2025 | 0 (not detected) |
| 2024 | 0.34 ppb |
| 2023 | 0.28 ppb |
| 2022 | 2.1 ppb |
| 2021 | 0.85 ppb |
| 2020 | 0 (not detected) |
| 2019 | 0 (not detected) |
| 2018 | 2.1 ppb |
| 2017 | 3.8 ppb |
| 2016 | 3.5 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. Far Horizons Mhp's 7 ppb sits at the 94th percentile in Arizona and the 95th nationally (higher means more lead).
Nearby utilities
137 other systems share Pima County; 5 of them have a higher latest lead result than Far Horizons Mhp. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Tucson City Of | 732,906 | 0.65 ppb |
| Metropolitan Dwid | 45,570 | 0.57 ppb |
| Oro Valley Water Utility | 42,316 | 1 ppb |
| Community Wc Of Green Valley | 22,085 | 0 (not detected) |
| Usaf Davis Monthan Afb | 18,640 | 0 (not detected) |
| Sahuarita Water Company | 18,178 | 0 (not detected) |
| Vail Water Company | 17,500 | 0 (not detected) |
| Flowing Wells Irrigation District | 16,000 | 0 (not detected) |
| Marana Municipal - Marana | 15,162 | 0 (not detected) |
| Tucson Water Corona De Tucson | 10,217 | 0.78 ppb |
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 Far Horizons 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. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.