Water Hardness in 93621
Dunlap, California · Fresno County
Dataset updated March 9, 2026Matched to 14 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 14 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 93621
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 |
|---|---|---|---|
City Of Fresno CA1010007 | surface water | 170 PPM Moderately Hard | |
City Of Clovis CA1010003 | surface water | 8 PPM SoftUSGS estimate: 170 PPM | |
California State University Fresno CA1010339 | groundwater | 170 PPM Moderately Hard | |
Cws - Selma CA1010024 | groundwater | 250 PPM Very Hard | |
City Of Sanger CA1010029 | groundwater | 287 PPM Very 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.
Moderately Hard Water
Your water is moderately hard. You're likely seeing scale buildup on fixtures, spotty dishes, and may notice dry skin or hair. A water softener or conditioner can help.
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 Dunlap, CA (93621).
Frequently Asked Questions
Is the water hard in Dunlap, CA (93621)?
The average water hardness in 93621 is 163 PPM (9.5 GPG), which is classified as moderately hard.
Do I need a water softener in 93621?
With hardness of 163 PPM, a water softener is worth considering for homes in 93621.
Is hard water in 93621 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 93621?
Zip code 93621 in Dunlap, California is served by 14 water systems.
Learn More About Your Water
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Salt-based softeners remove hardness minerals. Salt-free conditioners prevent scale but don't soften. Here's how to choose based on your water hardness level.
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