Utility-reported hardness
Unavailable
Ask your provider or test your tap
Local water dashboard
Official source aggregationWater quality in Kotlik, AK 99620
Regional hardness evidence, possible serving systems, EPA compliance history, and the measurements that are—and are not—available for Kusilvak Census Area.
Historical measurement record needs context
- Largest possible serving system
- Kotlik Water System
- Source water
- Surface water
- County
- Kusilvak Census Area
- 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 617 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.
Kotlik Water System
AK2272004 · Surface water · 617 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 (2)
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
- 0.002 mg/L
- Action level
- 0.015 mg/L
13% of the listed benchmark
Monitoring period: Jan 1, 2025 to Jun 30, 2025
Copper (90th percentile)
EPA SDWIS Lead and Copper Rule samples
- Reported level
- 1.83 mg/L
- Action level
- 1.3 mg/L
141% of the listed benchmark
Monitoring period: Jan 1, 2011 to Jun 30, 2011
Violation history (113)
| Rule | Status | Period |
|---|---|---|
| Surface Water Treatment Rule | Archived | Jan 1, 2026 to Jan 31, 2026 |
| Interim Enhanced Surface Water Treatment Rule | Archived | Jan 1, 2026 to Jan 31, 2026 |
| Lead and Copper Rule | Unaddressed | Jan 1, 2026 |
| Interim Enhanced Surface Water Treatment Rule | Archived | Dec 1, 2025 to Dec 31, 2025 |
| Surface Water Treatment Rule | Archived | Dec 1, 2025 to Dec 31, 2025 |
| CARBON, TOTAL | Resolved | Nov 1, 2025 to Nov 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | Archived | Nov 1, 2025 to Nov 30, 2025 |
| Surface Water Treatment Rule | Archived | Nov 1, 2025 to Nov 30, 2025 |
| CARBON, TOTAL | Resolved | Nov 1, 2025 to Nov 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | Archived | Oct 1, 2025 to Oct 31, 2025 |
| Surface Water Treatment Rule | Archived | Oct 1, 2025 to Oct 31, 2025 |
| Surface Water Treatment Rule | Archived | Sep 1, 2025 to Sep 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | Archived | Sep 1, 2025 to Sep 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | Archived | Aug 1, 2025 to Aug 31, 2025 |
| Surface Water Treatment Rule | Archived | Aug 1, 2025 to Aug 31, 2025 |
| Public Notice | Resolved | Jun 15, 2025 to Aug 7, 2025 |
| Public Notice | Resolved | Jun 15, 2025 to Aug 7, 2025 |
| Lead and Copper Rule | Unaddressed | May 29, 2025 |
| Surface Water Treatment Rule | Resolved | Apr 1, 2025 to Apr 30, 2025 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Apr 1, 2025 to Apr 30, 2025 |
| Lead and Copper Rule | Resolved | Jan 1, 2025 to Jun 13, 2025 |
| CARBON, TOTAL | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Surface Water Treatment RuleHealth-based | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| CARBON, TOTAL | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Chlorine | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Revised Total Coliform Rule | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Surface Water Treatment Rule | Resolved | Dec 1, 2024 to Dec 31, 2024 |
| Public Notice | Resolved | Nov 6, 2024 to Aug 7, 2025 |
| Surface Water Treatment Rule | Resolved | Oct 1, 2024 to Oct 31, 2024 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Oct 1, 2024 to Oct 31, 2024 |
| TTHM | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Total Haloacetic Acids (HAA5) | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| CARBON, TOTALHealth-based | Resolved | Oct 1, 2024 to Dec 31, 2024 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| Surface Water Treatment Rule | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| CARBON, TOTAL | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| CARBON, TOTAL | Resolved | Jul 1, 2024 to Jul 31, 2024 |
| Lead and Copper Rule | Resolved | Jul 1, 2024 to Jun 13, 2025 |
| CARBON, TOTALHealth-based | Resolved | Jul 1, 2024 to Sep 30, 2024 |
| Public Notice | Resolved | Jun 30, 2024 to Jul 17, 2024 |
| Surface Water Treatment Rule | Resolved | Jun 1, 2024 to Jun 30, 2024 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Jun 1, 2024 to Jun 30, 2024 |
| Public Notice | Resolved | Apr 16, 2024 to Jul 17, 2024 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Apr 1, 2024 to Apr 30, 2024 |
| Surface Water Treatment Rule | Resolved | Apr 1, 2024 to Apr 30, 2024 |
| Chlorine | Resolved | Apr 1, 2024 to Apr 30, 2024 |
| CARBON, TOTALHealth-based | Resolved | Apr 1, 2024 to Jun 30, 2024 |
| Revised Total Coliform Rule | Resolved | Apr 1, 2024 to Apr 30, 2024 |
| Public Notice | Resolved | Jan 9, 2024 to Mar 20, 2024 |
| Lead and Copper Rule | Resolved | Jan 1, 2024 to Jun 13, 2025 |
| CARBON, TOTAL | Resolved | Jan 1, 2024 to Feb 20, 2024 |
| CARBON, TOTALHealth-based | Resolved | Jan 1, 2024 to Mar 31, 2024 |
| CARBON, TOTAL | Resolved | Jan 1, 2024 to Feb 20, 2024 |
| Revised Total Coliform Rule | Resolved | Nov 1, 2023 to Nov 30, 2023 |
| Surface Water Treatment Rule | Resolved | Nov 1, 2023 to Nov 30, 2023 |
| Chlorine | Resolved | Oct 1, 2023 to Dec 27, 2023 |
| CARBON, TOTAL | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| CARBON, TOTAL | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| CARBON, TOTAL | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| TTHM | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| Total Haloacetic Acids (HAA5) | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| CARBON, TOTALHealth-based | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| CARBON, TOTAL | Resolved | Oct 1, 2023 to Dec 31, 2023 |
| CARBON, TOTALHealth-based | Resolved | Jul 1, 2023 to Sep 30, 2023 |
| Surface Water Treatment Rule | Resolved | Jun 1, 2023 to Jun 30, 2023 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Jun 1, 2023 to Jun 30, 2023 |
| Revised Total Coliform Rule | Resolved | Feb 1, 2023 to Feb 28, 2023 |
| 1,2,4-Trichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Xylenes, Total | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| o-Dichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| p-Dichlorobenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Vinyl chloride | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,1-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| trans-1,2-Dichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,1,1-Trichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Trichloroethylene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Toluene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| CHLOROBENZENE | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Ethylbenzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,2-Dichloropropane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Styrene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Carbon tetrachloride | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| cis-1,2-Dichloroethylene | 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 |
| DICHLOROMETHANE | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| 1,2-Dichloroethane | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| Benzene | Resolved | Jan 1, 2023 to Dec 31, 2023 |
| TTHM | Resolved | Oct 1, 2022 to Dec 31, 2022 |
| Total Haloacetic Acids (HAA5) | Resolved | Oct 1, 2022 to Dec 31, 2022 |
| TTHM | Resolved | Jul 1, 2022 to Sep 30, 2022 |
| Total Haloacetic Acids (HAA5) | Resolved | Jul 1, 2022 to Sep 30, 2022 |
| CARBON, TOTAL | Resolved | Jul 1, 2022 to Sep 30, 2022 |
| CARBON, TOTALHealth-based | Resolved | Apr 1, 2022 to Jun 30, 2022 |
| TTHM | Resolved | Apr 1, 2022 to Jun 30, 2022 |
| Total Haloacetic Acids (HAA5) | Resolved | Apr 1, 2022 to Jun 30, 2022 |
| CARBON, TOTAL | Resolved | Apr 1, 2022 to Jun 30, 2022 |
| Lead and Copper Rule | Resolved | Jan 1, 2022 to Jun 3, 2022 |
| CARBON, TOTALHealth-based | Resolved | Jan 1, 2022 to Mar 31, 2022 |
| Nitrate | Resolved | Jan 1, 2022 to Dec 31, 2022 |
| Consumer Confidence Rule | Resolved | Oct 1, 2021 to Aug 7, 2023 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Sep 1, 2021 to Sep 30, 2021 |
| Surface Water Treatment Rule | Resolved | Sep 1, 2021 to Sep 30, 2021 |
| Lead and Copper Rule | Resolved | Jul 1, 2021 to Jun 3, 2022 |
| Consumer Confidence Rule | Resolved | Jul 1, 2021 to Jun 28, 2023 |
| TTHM | Resolved | Jul 1, 2021 to Sep 30, 2021 |
| Total Haloacetic Acids (HAA5) | Resolved | Jul 1, 2021 to Sep 30, 2021 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Mar 1, 2021 to Mar 31, 2021 |
| Surface Water Treatment Rule | Resolved | Mar 1, 2021 to Mar 31, 2021 |
| Lead and Copper Rule | Resolved | Jan 1, 2021 to Jun 3, 2022 |
| Surface Water Treatment Rule | Resolved | Jan 1, 2021 to Jan 31, 2021 |
| Interim Enhanced Surface Water Treatment Rule | Resolved | Jan 1, 2021 to Jan 31, 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
A reported action-level record needs context. Check its monitoring period and the utility's current report.
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 Kotlik
Is tap water safe in Kotlik?+
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.