County · Alaska
Yukon-Koyukuk Census Area, Alaska: drinking water records
This overview covers 32 ZIP codes and 27 community water systems in Yukon-Koyukuk Census Area. It also stands in for 5 ZIP codes whose utility has too little EPA data for a page of its own.
System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.
Water systems with the most complete records
| Water system | People served | PFAS survey results | PFAS found | Health-based violations | Lead, 9 in 10 homes at or below |
|---|---|---|---|---|---|
| Galena WTP1 - City AK2360272 | 490 | 0 | 0 | 45 | 3.6 ppb |
| Mcgrath Water System AK2280155 | 341 | 0 | 0 | 23 | 0.9 ppb |
| Huslia Public Water System AK2300191 | 323 | 0 | 0 | 1 | 2.7 ppb |
| Too'Gha INC - in Tanana AK2360109 | 271 | 0 | 0 | 10 | 1.6 ppb |
| Nulato River Well AK2360785 | 245 | 0 | 0 | 2 | 2.3 ppb |
| Ruby Water System AK2360866 | 215 | 0 | 0 | 3 | 9 ppb |
| Kaltag Public Water System AK2360141 | 214 | 0 | 0 | 6 | 2.1 ppb |
| Grayling Water System AK2280066 | 207 | 0 | 0 | 43 | 2 ppb |
| Minto Community Water System AK2300159 | 205 | 0 | 0 | 10 | 0.3 ppb |
| Holy Cross Water System AK2280074 | 182 | 0 | 0 | 1 | 1.8 ppb |
| Venetie Water System AK2300248 | 181 | 0 | 0 | 2 | 1.4 ppb |
| Arctic Village Water System AK2300222 | 175 | 0 | 0 | 7 | 1.3 ppb |
| Allakaket Public Water System AK2300816 | 135 | 0 | 0 | 4 | 1.2 ppb |
| Circle Washeteria AK2300769 | 110 | 0 | 0 | 7 | 2.4 ppb |
| Hughes Public Water Supply AK2300272 | 107 | 0 | 0 | 3 | 2.6 ppb |
| Anvik Water System AK2280171 | 96 | 0 | 0 | 3 | 0.4 ppb |
| Rampart Washeteria AK2360816 | 88 | 0 | 0 | 6 | 3.4 ppb |
| Koyukuk Safewater Facility AK2360214 | 85 | 0 | 0 | 6 | 5.5 ppb |
| Chalkyitsik Village Water AK2300183 | 76 | 0 | 0 | 33 | 5.5 ppb |
| Shageluk Water System AK2280040 | 60 | 0 | 0 | 11 | 0.7 ppb |
| Stevens Village Water System AK2360442 | 28 | 0 | 0 | 1 | 4.5 ppb |
| Ft. Yukon Public Water System AK2360256 | 665 | 0 | 0 | 0 | 4.6 ppb |
| Nenana Municipal Water AK2390065 | 486 | 0 | 0 | 0 | 0.7 ppb |
| Galena WTP2 - Gila AK2360159 | 290 | 0 | 0 | 0 | 11 ppb |
| Manley Community Water System AK2300484 | 95 | 0 | 0 | 0 | 0 ppb |
ZIP reports in Yukon-Koyukuk Census Area
No ZIP report in this county is published yet.
These ZIP codes are covered by this overview because their utility has too little EPA data for a separate page: 99691, 99726, 99730, 99746, 99757.
Sources and scope
EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Page generated 2026-09-03.
Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.