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Water Hardness in 53811

Hazel Green, Wisconsin · Grant County

395 PPM
23.1 GPG
Very Hard
0Soft60120180300+
High Confidence - USGS Monitoring

Dataset updated March 9, 2026Matched to 5 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 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.

Source basis
1 USGS-backed source
5 matched systems total for this ZIP; USGS monitoring is used where treated-water reports are unavailable.
Water source profile
Primarily groundwater
Groundwater commonly picks up calcium and magnesium after contact with rock and soil. 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 53811

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.

5 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.
Platteville Waterworks
WI1220115
Very Hard
410 PPMgroundwater12,268 servedHigh Confidence - USGS Monitoring
Hazel Green Waterworks
WI1220102
Very Hard
301 PPMgroundwater1,193 servedEstimated - Nearby Data
Kieler Sd No 1
WI1220103
Very Hard
301 PPMgroundwater560 servedEstimated - Nearby Data
Maryville Sd 2
WI1220105
Very Hard
301 PPMgroundwater100 servedEstimated - Nearby Data
Stateline Mobile Home Park
WI1220100
Very Hard
301 PPMgroundwater37 servedEstimated - Nearby Data

Nearby Zip Codes

610252655380739053808406520012005380330152003200610362655207118052002200538184055382039761075265

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 Hazel Green, WI (53811).

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Frequently Asked Questions

Is the water hard in Hazel Green, WI (53811)?

The average water hardness in 53811 is 395 PPM (23.1 GPG), which is classified as very hard.

Do I need a water softener in 53811?

With hardness of 395 PPM, a water softener is recommended for homes in 53811.

Is hard water in 53811 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 53811?

Zip code 53811 in Hazel Green, Wisconsin is served by 5 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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Water Hardness Scale: PPM and GPG Chart

Use the USGS water hardness scale to compare PPM, GPG, and mg/L levels from soft to very hard water.

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

Well water is almost always harder than city water. Learn why, how to test your well, and the best treatment options for hard well water.

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