Naco Water Co Bisbee, AZ
Exceeded the action level in the past
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
Naco Water Co Bisbee at a glance
Naco Water Co Bisbee serves about 138 people through 55 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Cochise County, Arizona. EPA system ID: AZ0402112; phone on file: 623-935-1100. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2025 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Naco Water Co Bisbee is 16 ppb across 12 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0 (not detected) |
| 2025 | 0 (not detected) |
| 2024 | 16 ppb over 15 |
| 2023 | 2.5 ppb |
| 2022 | 2.6 ppb |
| 2021 | 4.1 ppb |
| 2020 | 0 (not detected) |
| 2019 | 0.63 ppb |
| 2018 | 1.4 ppb |
| 2017 | 0.59 ppb |
| 2016 | 4.5 ppb |
| 2016 | 7.3 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. Naco Water Co Bisbee's reported as 0 (not detected) sits at the 16th percentile in Arizona and the 12th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Cochise County
49 other systems share Cochise County; 18 of them have a higher latest lead result than Naco Water Co Bisbee. 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) |
Next steps for Glendale, AZ
Test your own tap with a certified lab first-draw sample; Glendale, 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 Water Co Bisbee 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Why an old exceedance still matters: over the limit before, under it now.