Water Hardness in 50158
Marshalltown, Iowa · Marshall County
Dataset updated March 9, 2026Matched to 10 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 10 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 50158
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 |
|---|---|---|---|
| Ia Regional Utilities Assoc (Waverly) IA0990701 | groundwater | 200 PPM HardUSGS estimate: 380 PPM | |
| Marshalltown Water Works IA6469042 | groundwater | 360 PPM Very Hard | |
| Sunset Village IA6469601 | groundwater | 380 PPM Very Hard | |
| Marshalltown Estates IA6400628 | groundwater | 360 PPM Very Hard | |
| Andrew Water Supply IA4903050 | groundwater | 360 PPM Very Hard |
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 Marshalltown, IA (50158).
Frequently Asked Questions
Is the water hard in Marshalltown, IA (50158)?
The average water hardness in 50158 is 271 PPM (15.8 GPG), which is classified as very hard.
Do I need a water softener in 50158?
With hardness of 271 PPM, a water softener is recommended for homes in 50158.
Is hard water in 50158 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 50158?
Zip code 50158 in Marshalltown, Iowa is served by 10 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
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