Water Hardness in 57790
Wall, South Dakota · Pennington County
Dataset updated March 9, 2026Matched to 5 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 5 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 57790
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 |
|---|---|---|---|
Rapid City SD4600406 | surface water | 150 PPM Moderately HardUSGS estimate: 198 PPM | |
Box Elder SD4600046 | groundwater | 150 PPM Moderately HardUSGS estimate: 558 PPM | |
Rapid Valley Sanitary District SD4600274 | surface water | 150 PPM Moderately HardUSGS estimate: 810 PPM | |
Wall SD4600417 | groundwater | 1523 PPM Very Hard | |
Wasta SD4600352 | groundwater | 558 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 Wall, SD (57790).
Frequently Asked Questions
Is the water hard in Wall, SD (57790)?
The average water hardness in 57790 is 160 PPM (9.4 GPG), which is classified as moderately hard.
Do I need a water softener in 57790?
With hardness of 160 PPM, a water softener is worth considering for homes in 57790.
Is hard water in 57790 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 57790?
Zip code 57790 in Wall, South Dakota is served by 5 water systems.
Learn More About Your Water
Do You Need a Water Softener? (Based on Your Water Hardness)
A data-driven guide to help you decide if a water softener is worth the investment based on your actual water hardness level.
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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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We tested KDF, Vitamin C, and carbon shower filters for hard water. Here are the filters that actually reduce mineral buildup on hair and skin.
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