Koyukuk Safewater Facility, AK
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (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. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
Koyukuk Safewater Facility at a glance
Koyukuk Safewater Facility serves about 85 people through 3 service connections, which makes it a very small system under EPA's size classes. It is owned by a Native American tribe and draws groundwater, in Yukon-Koyukuk Census Area County, Alaska. EPA system ID: AK2360214; phone on file: 907-927-2215. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 5.5 ppb from 5.5 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Koyukuk Safewater Facility is 5.5 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 0 (not detected) |
| 2025 | 5.5 ppb |
| 2023 | 3.7 ppb |
| 2022 | 2.5 ppb |
| 2020 | 3.42 ppb |
| 2017 | 2.85 ppb |
| 2016 | 3.3 ppb |
| 2016 | 3.95 ppb |
Against other Alaska systems
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. Koyukuk Safewater Facility's reported as 0 (not detected) sits at the 5th percentile in Alaska and the 8th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Yukon-Koyukuk Census Area County
26 other systems share Yukon-Koyukuk Census Area County; 25 of them have a higher latest lead result than Koyukuk Safewater Facility. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Ft. Yukon Public Water System | 665 | 4.6 ppb |
| Galena Wtp1 - City | 490 | 3.6 ppb |
| Nenana Municipal Water | 486 | 0.7 ppb |
| Mcgrath Water System | 341 | 0.53 ppb |
| Huslia Public Water System | 323 | 2.7 ppb |
| Galena Wtp2 - Gila | 290 | 2.5 ppb |
| Too'Gha Inc - In Tanana | 271 | 1.6 ppb |
| Nulato River Well | 245 | 2.3 ppb |
| Ruby Water System | 215 | 9 ppb |
| Kaltag Public Water System | 214 | 2.1 ppb |
Next steps for Koyukuk, AK
Look up your address in Koyukuk Safewater Facility's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Koyukuk Safewater Facility whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1790 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. A zero today does not rule out a jump later - the rules are tightening in 2027.