Where does the water in 99173 come from?

Water for zip code 99173 in Springdale, Washington is provided by 2 water systems. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 99173

Springdale, Washington · Stevens County

88 PPM

5.1 GPG

Slightly Hard

0Soft60120180300+

High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 2 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 2 matched water systems. 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 USGS-backed source

2 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.

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 99173

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.

2 water systems

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
Colville Water Department WA5314200	groundwater	82 PPM Slightly Hard	4,955	High Confidence - USGS Monitoring
Springdale Town Of WA5383400	groundwater	181 PPM Hard	315	Estimated - Nearby Data

Colville Water Department

WA5314200

Slightly Hard

82 PPMgroundwater4,955 servedHigh Confidence - USGS Monitoring

Springdale Town Of

WA5383400

Hard

181 PPMgroundwater315 servedEstimated - Nearby Data

Nearby Zip Codes

9918182 9901382 9903482 9904082 9911082 9913782 99148160 9912982 99109119 9910182 99006218 9902682

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 Springdale, WA (99173).

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Frequently Asked Questions

Is the water hard in Springdale, WA (99173)?

The average water hardness in 99173 is 88 PPM (5.1 GPG), which is classified as slightly hard.

Do I need a water softener in 99173?

At 88 PPM, your water is relatively soft. A water softener is generally not necessary.

Is hard water in 99173 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 99173?

Zip code 99173 in Springdale, Washington is served by 2 water systems.