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Water Hardness in 48341

Pontiac, Michigan · Oakland County

230 PPM
13.5 GPG
Hard
0Soft60120180300+
Verified - Utility Reported

Dataset updated March 9, 2026Matched to 25 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 25 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
2 verified treated-water sources
25 matched systems total for this ZIP; treated-water reports are prioritized when available.
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 48341

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.

25 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.
Troy
MI0006690
Hard
217 PPMsurface water85,854 servedHigh Confidence - USGS Monitoring
Rochester Hills
MI0000325
Hard
235 PPMsurface water74,000 servedHigh Confidence - USGS Monitoring
Waterford Township
MI0006910
Very Hard
322 PPMgroundwater73,441 servedVerified - Utility Reported
Source water: 402 PPM
Southfield
MI0006160
Hard
220 PPMsurface water71,739 servedHigh Confidence - USGS Monitoring
Pontiac
MI0005440
Hard
235 PPMsurface water63,600 servedHigh Confidence - USGS Monitoring
Showing the first 5 systems. Expand to review all matched systems.

Nearby Zip Codes

483422304832023048340230483022304830423048328230483262304830123048324230483092304832323048098230

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 Pontiac, MI (48341).

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Frequently Asked Questions

Is the water hard in Pontiac, MI (48341)?

The average water hardness in 48341 is 230 PPM (13.5 GPG), which is classified as hard.

Do I need a water softener in 48341?

With hardness of 230 PPM, a water softener is recommended for homes in 48341.

Is hard water in 48341 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 48341?

Zip code 48341 in Pontiac, Michigan is served by 25 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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