Water Hardness in 83605
Caldwell, Idaho · Canyon County
Dataset updated March 9, 2026Matched to 4 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 4 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 83605
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 |
|---|---|---|---|
| Nampa City Of ID3140080 | groundwater | 150 PPM Moderately HardUSGS estimate: 196 PPM | |
| Caldwell City Of ID3140013 | groundwater | 150 PPM Moderately HardUSGS estimate: 196 PPM | |
| Middleton City Of ID3140074 | groundwater | 150 PPM Moderately HardUSGS estimate: 110 PPM | |
| Vanal Heights Well Assn ID3140133 | groundwater | 150 PPM Moderately HardUSGS estimate: 134 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 Caldwell, ID (83605).
Frequently Asked Questions
Is the water hard in Caldwell, ID (83605)?
The average water hardness in 83605 is 150 PPM (8.8 GPG), which is classified as moderately hard.
Do I need a water softener in 83605?
With hardness of 150 PPM, a water softener is worth considering for homes in 83605.
Is hard water in 83605 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 83605?
Zip code 83605 in Caldwell, Idaho is served by 4 water systems.
Learn More About Your Water
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