Where does the water in 99754 come from?

Water for zip code 99754 in Koyukuk, Alaska is provided by 1 water system. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 99754

Q: Is the water hard in Koyukuk, AK (99754)?

The average water hardness in 99754 is 109 PPM (6.4 GPG), which is classified as slightly hard. A salt-free conditioner can help if you notice minor spotting on dishes.

Q: Do I need a water softener in 99754?

At 109 PPM, your water is relatively soft. A water softener is generally not necessary, though some homeowners prefer the feel of softened water.

Koyukuk, Alaska · Yukon-Koyukuk Census Area County

109 PPM

6.4 GPG

Slightly Hard

0Soft60120180300+

Estimated - County Avg

Dataset updated March 9, 2026Matched to 1 water systemTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 1 matched water system. When more than one system is matched, the displayed value is weighted toward larger known service populations when that data is available.

Source basis

1 estimated source

This ZIP reading needs local confirmation before equipment sizing or purchase decisions.

Water source profile

Primarily groundwater

Groundwater commonly picks up calcium and magnesium after contact with rock and soil. This profile is weighted by known population served across matched systems.

Data recency

March 9, 2026

Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

Hardness is a mineral-content reading, not a drinking-water safety rating. Use it for scale, appliance, and softener decisions; check your utility report or test your tap before sizing treatment equipment. See how we calculate local readings.

Water Systems Serving 99754

These are the systems matched to this ZIP code. The displayed ZIP value is weighted toward larger known service populations when population data is available.

1 water system

PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.

Water System	Source	Hardness	Pop. Served	Data Source
Koyukuk Safewater Facility AK2360214	groundwater	109 PPM Slightly Hard	85	Estimated - County Avg

Koyukuk Safewater Facility

AK2360214

Slightly Hard

109 PPMgroundwater85 servedEstimated - County Avg

Nearby Zip Codes

99765109

What This Means For You

Use this ZIP reading as a local planning estimate, not a final treatment specification. Hardness can vary by utility zone, seasonal blend, private well, and building plumbing. Confirm your tap reading with a utility report or home hardness test before sizing equipment.

Methodology Data sources How to test your water

Know your water hardness?

If you've tested your water or have your utility's CCR report, share your reading to help us improve accuracy for Koyukuk, AK (99754).

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Frequently Asked Questions

Is the water hard in Koyukuk, AK (99754)?

Our estimate for 99754 is 109 PPM (6.4 GPG), but it is based on nearby, county, or state-level data rather than a direct treated tap-water report for this exact location. Confirm with your utility or a home test.

Do I need a water softener in 99754?

Do not size a softener from this estimate alone. Confirm the actual tap-water hardness before choosing treatment equipment.

Is hard water in 99754 safe to drink?

Water hardness itself is a mineral-content reading, not a drinking-water safety rating. Calcium and magnesium are naturally occurring minerals, but you should check your utility's Consumer Confidence Report for contaminant and compliance information.

How many water systems serve 99754?

Zip code 99754 in Koyukuk, Alaska is served by 1 water system.