Water Hardness in Paterson, WA
Washington · 1 zip codes · 4 matched water systems
City avg (weighted): 197 PPM
Dataset updated March 9, 20264 matched water systems in the city rollupIndividual systems and ZIPs can differ. Methodology
Is Paterson, WA Water Hard or Soft?
The displayed hardness for Paterson, WA is 197 PPM (11.5 GPG) from Kennewick City Of, classified as hard. The citywide weighted average is 197 PPM.
Water hardness is not a drinking-water safety score. It measures calcium and magnesium minerals, and address-level results can shift by pressure zone, supply blend, building plumbing, or private well.
How this city reading is built
This city reading is a weighted rollup across 4 matched water systems and 1 ZIP code. Citywide readings are useful for comparison, but individual utility zones and ZIPs can differ.
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 in Paterson
These systems are matched to Paterson, WA. Citywide readings are useful for comparison, but the system serving a specific address may differ from the city average.
| Water System | Source | Hardness | Pop. Served |
|---|---|---|---|
| Kennewick City Of WA5338100 | surface water | 197 PPM HardUSGS estimate: 66 PPM | |
| Richland City Of WA5372250 | surface water | 197 PPM HardUSGS estimate: 66 PPM | |
| West Richland City Of WA5394900 | surface water | 197 PPM HardUSGS estimate: 81 PPM | |
| Oasis Water Corporation WA5319069 | groundwater | 197 PPM HardUSGS estimate: 113 PPM |
Zip Codes in Paterson, WA
What This Means For You
Use this city 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.
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 Paterson, WA.
Frequently Asked Questions
How hard is the water in Paterson, WA?
The citywide weighted average water hardness in Paterson, WA is 197 PPM (11.5 GPG), classified as hard. This is based on 4 matched water systems.
Do I need a water softener in Paterson, WA?
With a citywide average hardness of 197 PPM, a water softener is recommended for homes in Paterson. Confirm your tap reading before sizing equipment.
Is hard water in Paterson, WA 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 Paterson, WA?
Paterson, Washington is served by 4 matched water systems across 1 zip code.
Learn More About Your Water
How to Test Water Hardness at Home
Compare free lookups, soap tests, test strips, liquid drop kits, and lab tests for measuring water hardness.
8 min readWater Hardness Scale: PPM and GPG Chart
Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.
10 min readWell Water Hardness: Why It's Usually Hard & How to Treat It
Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.
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