Water Hardness in 99301
Pasco, Washington · Franklin County
Dataset updated March 9, 2026Matched to 17 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 17 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 99301
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 |
|---|---|---|---|
Pasco Water Department WA5366400 | surface water | 180 PPM HardUSGS estimate: 66 PPM | |
Great Basin Water Burbank WA5331477 | groundwater | 180 PPM HardUSGS estimate: 309 PPM | |
Great Basin Water Kiona WA5310724 | groundwater | 180 PPM HardUSGS estimate: 309 PPM | |
Clark Addition Water System WA53AB809 | groundwater | 180 PPM HardUSGS estimate: 309 PPM | |
Rangeview WA53AD017 | groundwater | 180 PPM HardUSGS estimate: 309 PPM |
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 Pasco, WA (99301).
Frequently Asked Questions
Is the water hard in Pasco, WA (99301)?
The average water hardness in 99301 is 180 PPM (10.5 GPG), which is classified as hard.
Do I need a water softener in 99301?
With hardness of 180 PPM, a water softener is recommended for homes in 99301.
Is hard water in 99301 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 99301?
Zip code 99301 in Pasco, Washington is served by 17 water systems.
Learn More About Your Water
Best Water Softeners 2026: Top Picks for Every Budget
We compared salt-based, salt-free, and portable water softeners. Here are our top picks based on water hardness level, home size, and budget.
12 min readWater Softener Size Calculator: What Grain Capacity Do You Need?
Calculate the right water softener size for your home. Enter your household size and water hardness to get a grain capacity recommendation.
7 min readHard Water and Hair: Effects, Damage Signs & What Actually Helps
How mineral buildup affects your hair - and what to do about it based on your actual water hardness level.
10 min read