Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Kobuk, AK 99751
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Northwest Arctic Borough.
No active health-based violation reported
- Largest possible serving system
- Kobuk Water System
- Source water
- Groundwater
- County
- Northwest Arctic Borough
- Profile updated
Your tap water
What does the utility report?
Match the utility name to your water bill. These results describe the utility’s water, not a test at your home. A ZIP can include several water systems.
Utility hardness unavailable in this index
Nearby river or groundwater samples cannot tell us the hardness coming out of your tap. Ask your water provider for total hardness as CaCO₃, or test it at home.
Find an official utility report →At a glance
What the current records say
EPA quarter 2026Q2
All possible systems
No active flag
0 active health-based records
Measurements by utility
Each result belongs to a specific system.
Utility match
1 system
Serves 93 people system-wide
Match the name on your water bill
Your utility’s measurements and compliance records
These are possible serving systems. A record for one system does not apply to every home in this ZIP. Confirm your provider before interpreting a measurement or notice. Federal records can lag current utility notices.
EPA snapshot: 2026Q2. Historical window begins Jan 1, 2021.
Kobuk Water System
AK2340565 · Groundwater · 93 people served system-wide
The system names this served city; Census place overlap links the city to this ZCTA.
No active health-based record in this imported snapshot
Find this utility’s official report →Measurements (1)
An action level is a regulatory trigger, not a pass/fail health boundary. A reported zero is the value in the source record and does not establish that lead is absent at your tap.
Lead (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 0.0027 mg/L
- Action level
- 0.015 mg/L
18% of the listed benchmark
Monitoring period: Jan 1, 2018 to Dec 31, 2020
Violation history (99)
| Rule | Status | Period |
|---|---|---|
| Groundwater Rule | Archived | Mar 1, 2026 to Mar 31, 2026 |
| Revised Total Coliform Rule | Resolved | Feb 1, 2026 to Feb 28, 2026 |
| Groundwater Rule | Archived | Feb 1, 2026 to Feb 28, 2026 |
| Chlorine | Resolved | Feb 1, 2026 to Feb 28, 2026 |
| Chlorine | Resolved | Jan 1, 2026 to Jan 31, 2026 |
| Revised Total Coliform Rule | Resolved | Jan 1, 2026 to Jan 31, 2026 |
| Groundwater Rule | Archived | Dec 1, 2025 to Dec 31, 2025 |
| Revised Total Coliform Rule | Resolved | Aug 1, 2025 to Aug 31, 2025 |
| Chlorine | Resolved | Aug 1, 2025 to Aug 31, 2025 |
| Groundwater Rule | Resolved | Aug 1, 2025 to Aug 31, 2025 |
| Groundwater Rule | Resolved | May 1, 2025 to May 31, 2025 |
| Groundwater Rule | Resolved | Apr 1, 2025 to Apr 30, 2025 |
| Groundwater Rule | Resolved | Feb 1, 2025 to Feb 28, 2025 |
| Chlorine | Resolved | Jan 1, 2025 to Jan 31, 2025 |
| Revised Total Coliform Rule | Resolved | Jan 1, 2025 to Jan 31, 2025 |
| Chlorine | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Revised Total Coliform Rule | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Revised Total Coliform Rule | Resolved | Oct 1, 2024 to Oct 31, 2024 |
| Chlorine | Resolved | Oct 1, 2024 to Oct 31, 2024 |
| Groundwater Rule | Resolved | Sep 1, 2024 to Sep 30, 2024 |
| Groundwater RuleHealth-based | Resolved | Aug 1, 2024 to May 15, 2025 |
| Groundwater Rule | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| Groundwater Rule | Resolved | Jun 1, 2024 to Jun 30, 2024 |
| Groundwater Rule | Resolved | May 1, 2024 to May 31, 2024 |
| Public Notice | Resolved | Apr 2, 2024 to May 10, 2024 |
| Groundwater Rule | Resolved | Apr 1, 2024 to Apr 30, 2024 |
| Groundwater RuleHealth-based | Resolved | Mar 1, 2024 to Mar 31, 2024 |
| Groundwater RuleHealth-based | Resolved | Feb 1, 2024 to Feb 29, 2024 |
| Groundwater RuleHealth-based | Resolved | Jan 1, 2024 to Jan 31, 2024 |
| Lead and Copper Rule | Unaddressed | Jan 1, 2024 |
| Groundwater Rule | Resolved | Nov 1, 2023 to Nov 30, 2023 |
| Revised Total Coliform Rule | Resolved | Nov 1, 2023 to Nov 30, 2023 |
| Chlorine | Resolved | Oct 1, 2023 to Dec 4, 2023 |
| Groundwater Rule | Resolved | Oct 1, 2023 to Oct 31, 2023 |
| Groundwater Rule | Resolved | Aug 1, 2023 to Aug 31, 2023 |
| Groundwater Rule | Resolved | Jul 1, 2023 to Jul 31, 2023 |
| Groundwater Rule | Resolved | Jun 1, 2023 to Jun 30, 2023 |
| Groundwater Rule | Resolved | May 1, 2023 to May 31, 2023 |
| Chlorine | Resolved | Apr 1, 2023 to May 2, 2023 |
| Groundwater Rule | Resolved | Apr 1, 2023 to Apr 30, 2023 |
| Public Notice | Resolved | Feb 26, 2023 to Jun 30, 2023 |
| Public Notice | Resolved | Feb 26, 2023 to Jun 30, 2023 |
| Public Notice | Resolved | Feb 26, 2023 to Jun 30, 2023 |
| Groundwater Rule | Resolved | Feb 1, 2023 to Feb 28, 2023 |
| 1,2,4-Trichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| DICHLOROMETHANE | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| o-Dichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,2-Dichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,1,1-Trichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,2-Dichloropropane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Trichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,1,2-Trichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Tetrachloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| CHLOROBENZENE | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Benzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Styrene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Total Haloacetic Acids (HAA5) | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Carbon tetrachloride | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Ethylbenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Xylenes, Total | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| trans-1,2-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| TTHM | Resolved | Jan 1, 2023 to Dec 31, 2025 |
| Nitrate | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,1-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| p-Dichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| cis-1,2-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Vinyl chloride | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Toluene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Groundwater RuleHealth-based | Resolved | Nov 1, 2022 to Nov 30, 2022 |
| Groundwater RuleHealth-based | Resolved | Oct 1, 2022 to Oct 31, 2022 |
| Groundwater RuleHealth-based | Resolved | Sep 1, 2022 to Sep 30, 2022 |
| Groundwater RuleHealth-based | Resolved | Jun 1, 2022 to Jun 30, 2022 |
| Groundwater RuleHealth-based | Resolved | May 1, 2022 to May 31, 2022 |
| Groundwater RuleHealth-based | Resolved | Feb 1, 2022 to Feb 28, 2022 |
| cis-1,2-Dichloroethylene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Xylenes, Total | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Vinyl chloride | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| 1,1-Dichloroethylene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| 1,1,1-Trichloroethane | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| 1,2-Dichloropropane | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Trichloroethylene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| 1,1,2-Trichloroethane | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Toluene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Tetrachloroethylene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Styrene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| o-Dichlorobenzene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Carbon tetrachloride | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Ethylbenzene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| 1,2-Dichloroethane | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| p-Dichlorobenzene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| DICHLOROMETHANE | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| trans-1,2-Dichloroethylene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| CHLOROBENZENE | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| 1,2,4-Trichlorobenzene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Benzene | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Groundwater Rule | Resolved | Nov 1, 2021 to Nov 30, 2021 |
| Groundwater Rule | Resolved | Oct 1, 2021 to Oct 31, 2021 |
| Groundwater Rule | Resolved | Sep 1, 2021 to Sep 30, 2021 |
| Groundwater RuleHealth-based | Resolved | Apr 1, 2021 to Apr 30, 2021 |
Hardness estimate unavailable
No responsible local estimate yet
We did not find enough qualifying recent USGS hardness observations within 25 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.
Evidence-first next steps
Confirm the problem before choosing treatment
This profile can help you ask the right question. It cannot select equipment for a property without a current result from the serving utility or the tap.
Confirm the serving system
ZIP boundaries and utility service areas do not perfectly match. Verify the system on a water bill before relying on system-wide records.
Read the current utility report
Use the current Consumer Confidence Report for treated-water results and official notices.
Find an official utility report →Test for the decision you face
Ask the utility for hardness or test at the tap. For health concerns, use a certified laboratory and targeted analysis.
Convert your hardness test result →Frequently asked
Water questions for Kobuk
Is tap water safe in Kobuk?+
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?+
Utility-reported hardness is unavailable in this index. Regional samples do not establish tap-water hardness. Ask your provider or test your tap.
Do I need a water softener?+
Confirm hardness at your tap and consider actual scale or spotting before choosing treatment. Regional environmental values cannot determine whether you need a softener. A softener addresses hardness, not every contaminant.