Hardness
Unavailable
No qualifying site within 75 miles
Local water dashboard
Official source aggregationWater quality in Koyuk, AK 99753
A source-transparent look at local hardness, associated public water systems, EPA compliance history, and the measurements that are—and are not—available for Nome Census Area.
No active health-based violation reported
- Primary matched system
- Koyuk Public Water System
- Source water
- Groundwater influenced by surface water
- County
- Nome Census Area
- Profile updated
At a glance
What the current records say
EPA quarter 2026Q2
Compliance screen
No active flag
0 active health-based records
Lead 90th percentile
7.0e-4 mg/L
5% of action level
Utility match
1 system
Serves 277 people system-wide
Hardness estimate unavailable
No responsible local estimate yet
We did not find enough qualifying recent USGS hardness observations within 75 miles of this ZIP centroid. We leave the value blank instead of substituting a state average. Ask the serving utility or test the household tap for a property-specific result.
EPA benchmark screen
Contaminant snapshot
Available numerical results from associated SDWIS community water systems, compared with the applicable action level or federal MCL. Federal measured-value coverage is incomplete.
1 pass
Lead (PB90)
7.0e-4 mg/L
Reported Dec 31, 2025
Copper (CU90)
Not available
No numerical 90th-percentile result
Numerical coverage
1 comparable result
Missing values remain blank; absence is not treated as a pass.
Lead (90th percentile)
Measured in mg/L
Local 7.0e-4
EPA limit 0.015
Share of EPA benchmark
100% line = listed limit
2026Q2
- All records
- 68
- Health-based
- 5
- Active health-based
- 0
| Contaminant or rule | System | Status | Period |
|---|---|---|---|
| Surface Water Treatment Rule | AK2340167 | Archived | Mar 1, 2026through Mar 31, 2026 |
| Surface Water Treatment Rule | AK2340167 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Revised Total Coliform Rule | AK2340167 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Chlorine | AK2340167 | Resolved | Jul 1, 2025through Jul 31, 2025 |
| Chlorine | AK2340167 | Resolved | May 1, 2025through May 31, 2025 |
| Revised Total Coliform Rule | AK2340167 | Resolved | May 1, 2025through May 31, 2025 |
| Surface Water Treatment Rule | AK2340167 | Resolved | May 1, 2025through May 31, 2025 |
| Surface Water Treatment Rule | AK2340167 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Chlorine | AK2340167 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| Revised Total Coliform Rule | AK2340167 | Resolved | Nov 1, 2024through Nov 30, 2024 |
| LEAD AND COPPER RULE REVISIONS | AK2340167 | Resolved | Oct 17, 2024through Jun 11, 2025 |
| LEAD AND COPPER RULE REVISIONSHealth-based | AK2340167 | Resolved | Oct 17, 2024through Jun 11, 2025 |
| Interim Enhanced Surface Water Treatment Rule | AK2340167 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Surface Water Treatment Rule | AK2340167 | Resolved | Oct 1, 2024through Oct 31, 2024 |
| Interim Enhanced Surface Water Treatment Rule | AK2340167 | Resolved | Apr 1, 2024through Apr 30, 2024 |
| Surface Water Treatment RuleHealth-based | AK2340167 | Resolved | Apr 1, 2024through Apr 30, 2024 |
| Chlorine | AK2340167 | Resolved | Jul 1, 2023through Aug 7, 2023 |
| Revised Total Coliform Rule | AK2340167 | Resolved | Jul 1, 2023through Jul 31, 2023 |
| Consumer Confidence Rule | AK2340167 | Resolved | Jul 1, 2023through Jul 13, 2023 |
| Surface Water Treatment Rule | AK2340167 | Resolved | Jul 1, 2023through Jul 31, 2023 |
No reported violation does not prove that every contaminant was tested or absent; SDWIS measured values are incomplete and lag state records.
Solutions matcher
Your personalized water action plan
Matched to Koyuk ZIP 99753 using available compliance data and 1 reported measurement benchmarks.
No urgent match
Start with an independent water test
This profile does not trigger a treatment recommendation. Test at the tap before investing in equipment.
Affiliate disclosure: we may earn a commission from qualifying purchases, at no added cost to you. Product matching is educational and does not replace certified water testing.
Frequently asked
Water questions for Koyuk
Is tap water safe in Koyuk?+
EPA ECHO shows no active health-based violation for the associated systems in this reporting snapshot. This does not prove every contaminant is absent; federal records can lag and household plumbing can change tap conditions.
How hard is the water?+
There are not enough qualifying nearby USGS observations for a responsible hardness estimate. Ask the serving utility or test the household tap.
Do I need a water softener?+
There is no high-hardness trigger in this profile. Confirm with a tap test before buying equipment.