Metropolitan Dwid, AZ
Lead detected, under the action levels
Latest 90th-percentile lead: 0.57 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.
Metropolitan Dwid at a glance
Metropolitan Dwid serves about 45,570 people through 18,196 service connections, which makes it a large system under EPA's size classes. It is privately owned and draws groundwater, in Pima County, Arizona. EPA system ID: AZ0410076; phone on file: 520-209-2842. They can tell you what your service line is made of and whether they pay to replace it.
Every lead result on file
Against the period ending 2022 (0.86 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Metropolitan Dwid is 1.8 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.57 ppb |
| 2022 | 0.86 ppb |
| 2019 | 1.3 ppb |
| 2016 | 1.8 ppb |
How Metropolitan Dwid 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. Metropolitan Dwid's 0.57 ppb sits at the 70th percentile in Arizona and the 44th nationally (higher means more lead).
Nearby utilities
137 other systems share Pima County; 36 of them have a higher latest lead result than Metropolitan Dwid. 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 |
| 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 |
| Green Valley Dwid | 8,687 | 0 (not detected) |
What to do in your house
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 Metropolitan Dwid 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. The action level is dropping - the 10 ppb rule from 2027.