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Water Hardness in 60935

Essex, Illinois · Kankakee County

206 PPM
12.1 GPG
Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 4 water systemsTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

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.

Source basis
1 USGS-backed source
4 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily surface water
Surface-water hardness can shift with reservoirs, runoff, season, and treatment. This profile is weighted by known population served across matched systems.
Data recency
March 9, 2026
Dataset rebuilt March 9, 2026; individual utility reporting years can vary.

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 60935

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.

4 water systems
PWSID is the public water system identifier. Data Source shows whether the hardness value comes from a treated-water report, USGS monitoring, or a local estimate; source year is shown when available.
Aqua Illinois-Kankakee
IL0915030
Hard
206 PPMsurface water80,000 servedHigh Confidence - USGS Monitoring
Pembroke Township
IL0910010
Hard
207 PPMgroundwater1,410 servedEstimated - County Avg
Hopkins Park
IL0910040
Hard
207 PPMgroundwater579 servedEstimated - County Avg
Lake Shannon
IL0910020
Hard
237 PPMsurface water500 servedEstimated - Nearby Data

Nearby Zip Codes

609692066096120660474290609132066040729460408151604242966091720660481147604163226094121060920208

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.

MethodologyData sourcesHow 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 Essex, IL (60935).

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Frequently Asked Questions

Is the water hard in Essex, IL (60935)?

The average water hardness in 60935 is 206 PPM (12.1 GPG), which is classified as hard.

Do I need a water softener in 60935?

With hardness of 206 PPM, a water softener is recommended for homes in 60935.

Is hard water in 60935 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 60935?

Zip code 60935 in Essex, Illinois is served by 4 water systems.

Learn More About Your Water

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Water Hardness Scale: PPM and GPG Chart

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Well Water Hardness: Why It's Usually Hard & How to Treat It

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