City water profile

Water hardness in Kotlik

Find official utility reports, understand hardness, and check the water system serving your home in Kotlik, Alaska.

Utility-reported hardness

Not yet available

Check your provider and source →

State comparison: Unavailable
Evidence comparison rank: —
Matched utilities: 1
Active health records: 0

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 →

Convert a hardness result →Test your tap →

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

Below action level

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

Above action level

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)

Imported violation history for Kotlik Water System
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

City summary

What the indexed records say

Kotlik has 1 published ZIP profile across Kusilvak Census Area. No qualifying nearby hardness observation is available for the city.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs

Moderately hard0 ZIPs

Hard0 ZIPs

Very hard0 ZIPs

0 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance: — miles
Profiles with evidence: 0/1

Confidence labels

High: 0Moderate: 0Low: 0

Observation window: unavailable to unavailable.

ZIP directory

Water reports in Kotlik

Open a ZIP for site-level provenance and measurements.

ZIP code

99620

No estimate

—

Nearest site: — mi
Confidence: —

View full ZIP evidence →

Practical next steps

Move from index to evidence

1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
3. Use a measured hardness result. Confirm health concerns or treatment sizing with the right method.

Continue comparing

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Questions people ask

About water in Kotlik

Is the water hard?

Check the utility-reported result above when available. Nearby environmental samples cannot establish tap-water hardness. Ask your provider or test your tap.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.