Water Hardness in 61462
Monmouth, Illinois · Warren County
Dataset updated March 9, 2026Matched to 3 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology
How this ZIP reading is built
This ZIP reading is built from 3 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 61462
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 |
|---|---|---|---|
| Monmouth IL1870150 | groundwater | 272 PPM Very Hard | |
| Little Swan Lake Sd IL1875050 | groundwater | 272 PPM Very Hard | |
| St Augustine IL0950500 | groundwater | 272 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 Monmouth, IL (61462).
Frequently Asked Questions
Is the water hard in Monmouth, IL (61462)?
The average water hardness in 61462 is 272 PPM (15.9 GPG), which is classified as very hard.
Do I need a water softener in 61462?
With hardness of 272 PPM, a water softener is recommended for homes in 61462.
Is hard water in 61462 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 61462?
Zip code 61462 in Monmouth, Illinois is served by 3 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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