Water Hardness in 52242
Iowa City, Iowa · Johnson County
Dataset updated March 9, 2026Matched to 7 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 7 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 52242
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 |
|---|---|---|---|
Iowa City Water Department IA5225079 | surface water | 180 PPM HardUSGS estimate: 438 PPM | |
University Water System IA5225101 | surface water | 180 PPM HardUSGS estimate: 438 PPM | |
Coralville Muni Water System IA5208071 | groundwater | 180 PPM HardUSGS estimate: 438 PPM | |
North Liberty Water Supply IA5252072 | groundwater | 180 PPM HardUSGS estimate: 355 PPM | |
Lake Ridge, Incorporated IA5225315 | groundwater | 180 PPM HardUSGS estimate: 508 PPM |
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.
Hard Water - Treatment Recommended
Your water is hard. Scale buildup is likely affecting your plumbing and appliances, reducing their lifespan and efficiency. A water softener is recommended to protect your home.
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 Iowa City, IA (52242).
Frequently Asked Questions
Is the water hard in Iowa City, IA (52242)?
The average water hardness in 52242 is 180 PPM (10.5 GPG), which is classified as hard.
Do I need a water softener in 52242?
With hardness of 180 PPM, a water softener is recommended for homes in 52242.
Is hard water in 52242 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 52242?
Zip code 52242 in Iowa City, Iowa is served by 7 water systems.
Learn More About Your Water
Best Water Softeners 2026: Top Picks for Every Budget
We compared salt-based, salt-free, and portable water softeners. Here are our top picks based on water hardness level, home size, and budget.
12 min readWater Softener Size Calculator: What Grain Capacity Do You Need?
Calculate the right water softener size for your home. Enter your household size and water hardness to get a grain capacity recommendation.
7 min readHard Water and Hair: Effects, Damage Signs & What Actually Helps
How mineral buildup affects your hair - and what to do about it based on your actual water hardness level.
10 min read