I wrote Sunday about a fascinating place in Minnesota: the Fredrick-Miller Spring, spouting from a pipe on the edge of a patch of woodlands in Eden Prairie. It's one of two natural springs preserved in the city: the other is further west, in the Richard T. Anderson Conservation Area.

For the story, the city provided me with a water test result from January that shows the absence of any coliform bacteria and a nitrate level of 2.1 milligrams per liter, or about one-fifth of the legal level in drinking water. One reader pointed out that the level, since it's well above zero, might indicate the presence of other contaminants that aren't being tested. That's up to the water drinkers to find out, if they're interested. Meanwhile, the city says it has no record of anyone ever getting sick from the spring.