I didn't catch whether that was sanitary or storm, I presume sanitary.
The good treatment plants remove most of the bacteria before releasing the water, and in the wash fields that lots of plants have, that bacteria breaks down. Quail don't drink that much water, not enough to make the whole bird poisonous just by long term consumption of slightly contaminated water.
You wouldn't eat the junk that a hog would eat, would you? but you'd eat the wild hog that had lived on toadstools, acorns, and even carrion, right?
A vet passed something on to me once. Animals have evolved living on dead stuff. Unsanitary, spoiled, fly infested garbage, and they still live that way. He said that two things help. The animals have much stronger digestive powers, and they have much shorter digestive duration. It's harder to get a roaring culture of some bacteria when the stuff is blown out of your colon in a few hours.
It's literally impossible to answer your question without knowing all of the facts. If you want to know the correct answer call the water treatment plant and ask whether birds or other wildlife have access to toxic water, and if there is plenty of non-toxic water available nearby.
Here's another tip. Go up to that lake and look for the frogs, minnows, turtles, etc... if a bullfrog can live in it, it should be safe.
