Community Water System · PWS AK2340167
Koyuk Public Water System
Operator location Koyuk, Alaska - smaller served population (≤ 999) at 277 people served; 918 SDWIS violations on record from surface water sources.
- 277
- People served (this PWS)
- 918
- EPA violations (this PWS)
- 38
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Koyuk Public Water System standing, high SDWIS violation third
277 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%).
The verdict
Koyuk Public Water System sits in the upper third of the sitemap cohort by violation count (918), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (277; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 918
- Total EPA violations on record
- 4%
- Health-based (MCL / treatment failure)
- 277
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Native American
- Connections
- 82
- County
- Nome Census Area
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 697
- Treatment Tech Violations
- 29
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 71 | 2025 |
| Coliform (TCR) | MR | 29 | 2015 |
| Surface Water Treatment Rule | TT | 26 | 2024 |
| Revised Total Coliform Rule | MON | 26 | 2025 |
| Consumer Confidence Rule | Other | 23 | 2023 |
| Chlorine | MR | 21 | 2025 |
| Nitrate | MR | 16 | 2022 |
| Interim Enhanced Surface Water Treatment Rule | MR | 16 | 2024 |
| Total Polychlorinated Biphenyls (PCB) | MR | 12 | 1998 |
| Pentachlorophenol | MR | 12 | 1998 |
| Heptachlor epoxide | MR | 12 | 1998 |
| Heptachlor | MR | 12 | 1998 |
| 2,4-D | MR | 12 | 1998 |
| Toxaphene | MR | 12 | 1998 |
| BHC-GAMMA | MR | 12 | 1998 |
| Methoxychlor | MR | 12 | 1998 |
| Chlordane | MR | 12 | 1998 |
| Atrazine | MR | 12 | 1998 |
| 2,4,5-TP | MR | 12 | 1998 |
| p-Dichlorobenzene | MR | 11 | 2022 |
| o-Dichlorobenzene | MR | 11 | 2022 |
| Tetrachloroethylene | MR | 11 | 2022 |
| Carbon tetrachloride | MR | 11 | 2022 |
| CHLOROBENZENE | MR | 11 | 2022 |
| Toluene | MR | 11 | 2022 |
| Styrene | MR | 11 | 2022 |
| Ethylbenzene | MR | 11 | 2022 |
| 1,2-Dichloropropane | MR | 11 | 2022 |
| cis-1,2-Dichloroethylene | MR | 11 | 2022 |
| trans-1,2-Dichloroethylene | MR | 11 | 2022 |
Violation Count vs. the National Corpus
Koyuk Public Water System has 918 recorded EPA violations, 99% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 1% carry more. 4% of this system's own violations are health-based (38 of 918), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
918 Higher than most more violations than 99% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Population served record for Koyuk Public Water System
EPA SDWIS lists 277 people served and 82 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
918 violations · 277 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Koyuk Public Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Alaska compares on the same EPA violation measures. Alaska systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.