Naco Estates, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2021-2023). 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.
Naco Estates at a glance
Naco Estates serves about 75 people through 30 service connections, which makes it a very small system under EPA's size classes. It is under mixed public and private ownership and draws groundwater, in Cochise County, Arizona. EPA system ID: AZ0402345; phone on file: 520-432-3347. They can tell you what your service line is made of and whether they pay to replace it.
Naco Estates's lead record
Against the period ending 2020 (2 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Naco Estates is 2.22 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 1 ppb |
| 2020 | 2 ppb |
| 2017 | 1.19 ppb |
| 2016 | 2.22 ppb |
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. Naco Estates's 1 ppb sits at the 74th percentile in Arizona and the 51st nationally (higher means more lead).
Neighbouring systems
49 other systems share Cochise County; 11 of them have a higher latest lead result than Naco Estates. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Bella Vista City Water System | 20,045 | 0 (not detected) |
| Douglas City Of | 16,656 | 0 (not detected) |
| Us Army Fort Huachuca | 15,603 | 0 (not detected) |
| Pueblo Del Sol Water Company | 12,804 | 0 (not detected) |
| Arizona Water Co - Sierra Vista | 9,233 | 0 (not detected) |
| Arizona Water Co - Bisbee | 8,590 | 0 (not detected) |
| Benson, City Of Water System | 5,355 | 0 (not detected) |
| City Of Willcox | 3,236 | 0 (not detected) |
| St David Dwid | 2,192 | 0 (not detected) |
| Bella Vista Water South | 2,178 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Sierra Vista, 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 Naco Estates 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.