Water Hardness in 92203
Indio, California · Riverside County
Dataset updated March 9, 2026Matched to 24 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 24 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 92203
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 |
|---|---|---|---|
| Eastern Municipal Wd CA3310009 | surface water | 106 PPM Slightly HardUSGS estimate: 386 PPM | |
| Riverside, City Of CA3310031 | surface water | 190 PPM HardUSGS estimate: 153 PPM | |
| Coachella Vwd: Cove Community CA3310001 | groundwater | 32 PPM SoftUSGS estimate: 140 PPM | |
| Elsinore Valley Mwd CA3310012 | surface water | 120 PPM Moderately HardUSGS estimate: 386 PPM | |
| Corona, City Of CA3310037 | surface water | 180 PPM HardUSGS estimate: 175 PPM |
Nearby Zip Codes
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.
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 Indio, CA (92203).
Frequently Asked Questions
Is the water hard in Indio, CA (92203)?
The average water hardness in 92203 is 187 PPM (10.9 GPG), which is classified as hard.
Do I need a water softener in 92203?
With hardness of 187 PPM, a water softener is recommended for homes in 92203.
Is hard water in 92203 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 92203?
Zip code 92203 in Indio, California is served by 24 water systems.
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.
8 min read