Where does the water in 49405 come from?

Water for zip code 49405 in Custer, Michigan is provided by 1 water system. Contact your local utility for specific source information, or check our detailed page for your area.

Water Hardness in 49405

Custer, Michigan · Mason County

160 PPM

9.4 GPG

Moderately Hard

0Soft60120180300+

Verified - Utility Reported

Dataset updated March 9, 2026Matched to 1 water systemTap readings can vary by utility zone, treatment, and plumbing. Methodology

Source context

How this ZIP reading is built

This ZIP reading is built from 1 matched water system. 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 verified treated-water source

1 matched system 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 49405

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.

1 water system

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.

Water System	Source	Hardness	Pop. Served	Data Source
Grand Rapids MI0002790	surface water	160 PPM Moderately Hard USGS estimate: 200 PPM	273,005	Verified - Utility Reported

Grand Rapids

MI0002790

Moderately Hard

160 PPMsurface water273,005 servedVerified - Utility Reported

Source water: 200 PPM

Nearby Zip Codes

49458160 49454135 49410160 49402160 49431130 49459160 49449151 49420100 49411160 4930454 49309160 49644160

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.

Methodology Data sources How 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 Custer, MI (49405).

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Frequently Asked Questions

Is the water hard in Custer, MI (49405)?

The average water hardness in 49405 is 160 PPM (9.4 GPG), which is classified as moderately hard.

Do I need a water softener in 49405?

With hardness of 160 PPM, a water softener is worth considering for homes in 49405.

Is hard water in 49405 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 49405?

Zip code 49405 in Custer, Michigan is served by 1 water system.