Is tap water safe in Kotlik?

EPA SDWIS shows no active health-based violation in this profile's reporting window. That is not the same as proving every contaminant is absent, and federal data can lag state and utility records.

How hard is the water in Kotlik, AK?

There are not enough qualifying nearby USGS hardness observations for a responsible estimate. Test the home's tap or consult the serving utility.

Do I need a water softener in ZIP code 99620?

There is no high-hardness trigger in this profile. Confirm conditions with an at-home hardness test before purchasing equipment.

City water profile

Kotlik water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Kotlik, Alaska.

Median indexed hardness

—

One indexed ZIP

Range —–— PPM

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

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 →

Public water systems

Utilities associated with this city

Kotlik Water System

PWSID AK2272004

Surface water

System population served: 617
Last reported: Jun 19, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

Record	System	Period	Status
Surface Water Treatment Rule	AK2272004	Jan 1, 2026	Archived
Interim Enhanced Surface Water Treatment Rule	AK2272004	Jan 1, 2026	Archived
Lead and Copper Rule	AK2272004	Jan 1, 2026	Unaddressed
Interim Enhanced Surface Water Treatment Rule	AK2272004	Dec 1, 2025	Archived
Surface Water Treatment Rule	AK2272004	Dec 1, 2025	Archived
CARBON, TOTAL	AK2272004	Nov 1, 2025	Resolved
Interim Enhanced Surface Water Treatment Rule	AK2272004	Nov 1, 2025	Archived
Surface Water Treatment Rule	AK2272004	Nov 1, 2025	Archived
CARBON, TOTAL	AK2272004	Nov 1, 2025	Resolved
Interim Enhanced Surface Water Treatment Rule	AK2272004	Oct 1, 2025	Archived

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. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Continue comparing

Other Alaska communities

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196 PPM median

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Russian Mission

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Alakanuk

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— No median

Chevak

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— No median

Emmonak

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— No median

Search all 131 Alaska cities →

Questions people ask

About water in Kotlik

Is the water hard?

The index does not have a qualifying hardness estimate for this city.

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.