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Water Hardness in 53073

Plymouth, Wisconsin · Sheboygan County

344 PPM
20.1 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
3 USGS-backed sources
5 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 53073

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.
Sheboygan Water Utilities
WI4600354
Very Hard
332 PPMsurface water49,931 servedEstimated - Nearby Data
Plymouth Utilities
WI4600446
Very Hard
396 PPMgroundwater8,964 servedHigh Confidence - USGS Monitoring
Kettle Moraine Correctional Institution
WI4600449
Very Hard
391 PPMgroundwater1,544 servedHigh Confidence - USGS Monitoring
Lakeland University
WI4600487
Very Hard
396 PPMgroundwater1,200 servedHigh Confidence - USGS Monitoring
Rocky Knoll Health Care Fac
WI4600447
Very Hard
396 PPMgroundwater564 servedEstimated - Nearby Data

Nearby Zip Codes

530233325308534053020334530933325301133253001332530443325307930553075334530833325305730553070335

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 Plymouth, WI (53073).

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Frequently Asked Questions

Is the water hard in Plymouth, WI (53073)?

The average water hardness in 53073 is 344 PPM (20.1 GPG), which is classified as very hard.

Do I need a water softener in 53073?

With hardness of 344 PPM, a water softener is recommended for homes in 53073.

Is hard water in 53073 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 53073?

Zip code 53073 in Plymouth, 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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