Water Hardness in 99344
Mattawa, Washington · Adams County
Dataset updated March 9, 2026Matched to 23 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 23 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.
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 99344
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.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
Othello Water Department WA5364850 | groundwater | 246 PPM Hard | |
Adams County Water Dist #1 WA5322525 | groundwater | 246 PPM Hard | |
Royal Water District WA5300543 | groundwater | 246 PPM Hard | |
Ringold Domestic Water Corp WA5372500 | groundwater | 246 PPM Hard | |
West Mesa Domestic Water Assn WA5394830 | groundwater | 246 PPM Hard |
Nearby Zip Codes
What This Means For You
Recommendations are based on the displayed ZIP hardness reading. Confirm your tap reading before sizing or buying treatment equipment.
Hard Water - Treatment Recommended
Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.
Recommended Products
Learn more: Do I Need a Water Softener? | Salt-Based vs Salt-Free | Size Calculator | 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 Mattawa, WA (99344).
Frequently Asked Questions
Is the water hard in Mattawa, WA (99344)?
The average water hardness in 99344 is 246 PPM (14.4 GPG), which is classified as hard.
Do I need a water softener in 99344?
With hardness of 246 PPM, a water softener is recommended for homes in 99344.
Is hard water in 99344 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 99344?
Zip code 99344 in Mattawa, Washington is served by 23 water systems.
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