Water Hardness in 85743
Tucson, Arizona · Pima County
Dataset updated March 9, 2026Matched to 25 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 25 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 85743
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 |
|---|---|---|---|
| Tucson City Of AZ0410112 | groundwater | 220 PPM HardUSGS estimate: 203 PPM | |
| Metropolitan Dwid AZ0410076 | groundwater | 220 PPM HardUSGS estimate: 203 PPM | |
| Oro Valley Water Utility AZ0410164 | groundwater | 220 PPM HardUSGS estimate: 91 PPM | |
| Community Wc Of Green Valley AZ0410004 | groundwater | 220 PPM HardUSGS estimate: 228 PPM | |
| Usaf Davis Monthan Afb AZ0420549 | groundwater | 220 PPM HardUSGS estimate: 149 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 Tucson, AZ (85743).
Frequently Asked Questions
Is the water hard in Tucson, AZ (85743)?
The average water hardness in 85743 is 220 PPM (12.9 GPG), which is classified as hard.
Do I need a water softener in 85743?
With hardness of 220 PPM, a water softener is recommended for homes in 85743.
Is hard water in 85743 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 85743?
Zip code 85743 in Tucson, Arizona is served by 25 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.
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