Water Quality in KOYUK, AK (99753)
EPA violation data for public water systems serving ZIP code 99753.
82
Total Violations
12
Health-Based
70
Monitoring / Reporting
82
Resolved
What does this mean?
82 of 82 violations have been resolved. 12 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 70 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.
Violations Detail (82 total)
| Contaminant | Category | MCL Limit | Measured | Date | Status | Health Effects |
|---|---|---|---|---|---|---|
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Jun 30, 2025 | Resolved | N/A |
| Surface Water Treatment Rule | Monitoring | N/A | N/A | Jun 30, 2025 | Resolved | N/A |
| Chlorine | Monitoring | N/A | N/A | Jun 30, 2025 | Resolved | Eye and nose irritation; stomach discomfort |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Apr 30, 2025 | Resolved | N/A |
| Chlorine | Monitoring | N/A | N/A | Apr 30, 2025 | Resolved | Eye and nose irritation; stomach discomfort |
| Surface Water Treatment Rule | Monitoring | N/A | N/A | Apr 30, 2025 | Resolved | N/A |
| Chlorine | Monitoring | N/A | N/A | Oct 31, 2024 | Resolved | Eye and nose irritation; stomach discomfort |
| Surface Water Treatment Rule | Monitoring | N/A | N/A | Oct 31, 2024 | Resolved | N/A |
| Revised Total Coliform Rule | Monitoring | N/A | N/A | Oct 31, 2024 | Resolved | N/A |
| LEAD AND COPPER RULE REVISIONS | Health-Based | N/A | N/A | Oct 16, 2024 | Resolved | N/A |
Lead & Copper Levels
Violation Timeline
2025(6)
Revised Total Coliform Rule
3A
Surface Water Treatment Rule
36
Chlorine
27
Revised Total Coliform Rule
3A
Chlorine
27
Surface Water Treatment Rule
36
2024(13)
Chlorine
27
Surface Water Treatment Rule
36
Revised Total Coliform Rule
3A
LEAD AND COPPER RULE REVISIONS
2E
LEAD AND COPPER RULE REVISIONS
4G
LEAD AND COPPER RULE REVISIONS
4G
LEAD AND COPPER RULE REVISIONS
2E
Surface Water Treatment Rule
36
Interim Enhanced Surface Water Treatment Rule
38
Interim Enhanced Surface Water Treatment Rule
38
Surface Water Treatment Rule
41
Surface Water Treatment Rule
41
Surface Water Treatment Rule
41
How Does This Compare?
KOYUK (99753) has 82 recorded violations, including 12 health-based. All violations have been resolved, which is a positive sign for current water quality. Consider testing your tap water independently for added peace of mind.
Recommended Water Filters
Based on the contaminants detected in your area, these filter types may help improve your water quality.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Activated Carbon Filter
Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.
Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor
Look for:NSF/ANSI 42 & 53 certified
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove.