Mequon, WI water hardness
Mequon water hardness: one published figure, and most homes outside it
The only hardness figure published for Mequon belongs to the Mequon Water Utility's purchased Lake Michigan water: roughly 137 milligrams per liter of hardness, which works out to about 8 grains per gallon. Most of the city pumps its own water from private wells, and those carry no published figure at all.
Call (262) 829-5961Mon to Fri, 7am to 5pmSource: Mequon Water Utility; North Shore Water Commission; Milwaukee Water Works; Urban Milwaukee, September 2023
Two suppliers behind the utility's water
Two suppliers, Milwaukee Water Works and the North Shore Water Commission, sell the Mequon Water Utility treated Lake Michigan water, and the utility resells it without treating any of its own.
Both suppliers publish a hardness of roughly 137 milligrams per liter. That is what people mean when they say Mequon water is 8 grains, and it describes the utility's customers, not the city as a whole.
137 milligrams per liter, placed on the USGS scale
Put 137 on the USGS scale and it lands in the band called hard, which runs from 121 to 180. Below that band sit moderately hard, 61 to 120, and soft, 60 and under; above 180, near 10.5 grains, the label turns to very hard.
Divided by 17.1, the utility's 137 comes to about 8 grains per gallon: hard water, but nearer the bottom of its band than the top.
The homes the figure leaves out
Roughly eleven thousand people are on the utility system, in a city the state's 2026 estimate puts at 25,257. In September 2023, Urban Milwaukee reported that most Mequon residents still rely on wells of their own.
A private well draws Ozaukee County groundwater from carbonate rock, and no one publishes its hardness. The utility's 8 grains tells you nothing about it.
Finding the number for your house
If the Mequon Water Utility bills you, your figure is the one both suppliers publish, 137 milligrams per liter.
On a well, the number lives on that well's lab sheet. Some labs give milligrams per liter and some give grains; 17.1 milligrams per liter equal one grain. With no lab sheet, the first hardness number comes from the plumber, at your tap, before the softener is connected.
What the call does with the number
Utility customers start from the published figure, and the call says plainly that 8 grains is a modest number. Households on wells start from their lab sheet, or from the test on install day.
Either way, the softener takes its setting from your own tap's reading, and that tap is retested until it shows zero.
Common questions
Is Mequon water 8 grains?
The utility's water is, at roughly 137 milligrams per liter. Most of the city is on private wells, and those have no published number.
What is 8 grains in milligrams per liter?
About 137, the figure both suppliers publish. Multiplying grains by 17.1 gives milligrams per liter.
More for Mequon homes
- Water softener installation in Mequon, WI
- Water softener replacement in Mequon, WI
- Well water softeners in Mequon, WI
- Mequon water guides
- Who runs Mequon Water Softener Co., and what it does
- Water softener quotes in Mequon, WI
- Mequon Water Utility customer, or well owner? How to know
- Test first: a Mequon well owner's order of operations
- When a Mequon listing says private well: the questions to ask
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