I've worked as the chief staffer, separately, to the elected Mayors of Madison and Milwaukee, and I cannot imagine Madison Mayor Paul Soglin or Milwaukee Mayor John Norquist responding favorably to the letter about water sale policy and government procedures sent to Milwaukee Mayor Tom Barrett by Dan Duchniak, the non-elected general manager of Waukesha's Water Utility.
Remember that the vote on the Milwaukee Common Council to enunciate a city water sales policy was 14-0, with one absent.
Here's a link to the pdf of the letter.