Which Waukesha County homes are on Lake Michigan water?

Three water systems in Waukesha County buy Lake Michigan water: the City of Waukesha's since October 2023, New Berlin's since July 2009, and part of Menomonee Falls'. Every other system in the county pumps groundwater, and no private well was part of any switch.

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New Berlin, since July 2009

New Berlin's utility treats nothing itself; every gallon on its city system is bought from Milwaukee Water Works. Until July 2009 the city pumped its own groundwater, a supply the utility rated at 18 to 32 grains.

Milwaukee's own figure for the lake supply is 137 milligrams per liter, roughly 8 grains, while New Berlin's literature puts it at 8 to 10. The utility now advises city customers that a softener should no longer be necessary.

The City of Waukesha, since October 2023

Waukesha won approval under the Great Lakes Compact in 2016, the first community lying wholly outside the basin to get it, and the lake water reached city taps in October 2023. The deep wells it replaced had run roughly 21 grains; the lake supply arrives at about 8.

The switch stopped at the city's mains. Private wells outside the city system, the Village of Waukesha's among them, kept drawing the groundwater they always had.

Menomonee Falls, both at once

Menomonee Falls buys Milwaukee's lake water and pumps its own wells for the rest, and it publishes both: 7 to 9 grains for the lake water and 27 to 32 for the village wells. That is one village with two waters, roughly four times apart.

Which one reaches a house depends on the address, and the village utility is the place to ask.

Everyone else is on groundwater

Brookfield, Pewaukee, Oconomowoc, Hartland, Sussex, Delafield, Mukwonago and Muskego all pump wells. The Town of Brookfield's Sanitary District No. 4 is a separate system that publishes 32 to 35 grains, nothing like lake water, and connected houses in Elm Grove are on Brookfield's well water too.

Some of that is unlikely to change. Brookfield stayed on its wells when neighbors moved to the lake, and Oconomowoc sits outside the Great Lakes basin with no lake connection at all.

What lake water means for a softener

Lake water near 8 grains is hard on the USGS scale, not very hard, and a softener has a much smaller job on it than on the county's groundwater. New Berlin's utility goes as far as telling its city customers they can do without one.

On lake water, the quote call starts from that question, whether softening is worth it for your house at all, and you will hear a plain answer either way. On groundwater, the utilities' own figures usually make the case.

Common questions

Will my town switch to lake water?

Not on any timetable the utilities publish. Brookfield kept its wells when neighbors moved to the lake, and Oconomowoc, outside the Great Lakes basin, has applied for nothing of the kind.

Can a lake-water home go without a softener?

That is each household's call. About 8 grains is hard but not very hard, and New Berlin's utility tells city customers a softener should no longer be needed. If softening would not earn its place in your house, you will hear that on the call.

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