Diomede Joint Utilities, AK
Exceeded the action level in the past
Latest 90th-percentile lead: 6 ppb (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.
Diomede Joint Utilities at a glance
Diomede Joint Utilities serves about 83 people through 4 service connections, which makes it a very small system under EPA's size classes. It is owned by a Native American tribe and draws surface water, in Nome Census Area County, Alaska. EPA system ID: AK2340141; phone on file: 907-686-3071. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Diomede Joint Utilities's lead record
That is up 3.1 ppb from 2.9 ppb in the period ending 2024. The highest 90th-percentile result EPA holds for Diomede Joint Utilities is 20.6 ppb across 9 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 6 ppb |
| 2024 | 2.9 ppb |
| 2021 | 10 ppb |
| 2019 | 1.6 ppb |
| 2018 | 13.6 ppb over 10 |
| 2018 | 13.6 ppb over 10 |
| 2017 | 20.6 ppb over 15 |
| 2016 | 11.4 ppb over 10 |
| 2016 | 7.7 ppb |
How Diomede Joint Utilities compares
Of the 394 Alaska systems with a lead result, the median latest reading is 1.6 ppb; 3 are over 15 ppb right now and 53 have gone over at some point. Diomede Joint Utilities's 6 ppb sits at the 90th percentile in Alaska and the 93rd nationally (higher means more lead).
Other water systems in Nome Census Area County
16 other systems share Nome Census Area County; 1 of them has a higher latest lead result than Diomede Joint Utilities. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Nome Joint Utility System | 3,920 | 2.41 ppb |
| Savoonga Water Supply | 802 | 2.6 ppb |
| Unalakleet City Water Supply | 757 | 1.4 ppb |
| Gambell Water System | 669 | 0.71 ppb |
| Stebbins City Water Supply | 590 | 2.5 ppb |
| Shishmaref Water System | 572 | 0.27 ppb |
| St. Michael Water System | 495 | 3.2 ppb |
| Brevig Mission Water System | 442 | 1.9 ppb |
| Elim Water Supply | 320 | 1.9 ppb |
| Quality Services, Llc Water Delivery | 300 | - |
Next steps for Diomide, AK
Test your own tap with a certified lab first-draw sample; Diomide, AK 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 Diomede Joint Utilities whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1900 ppb (copper action level 1,300 ppb).
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. More in what a past exceedance means today.