When I was a kid, my grandparents pulled their water for bathing and the commode out of a pond. Drinking water came from a well, when it developed problems, drinking water came from a tank that caught the run-off rain from the roof of the house. My grandpa would move the drain pipe from the gutters out of the tank untill it rained a while, to wash dust and bird poop off, and then he would move the drain pipe so that it filled the tank. And that is what we drank.
When you state that the water from the pond is being used in the home, is it consumed by the people, or just used for washing? That would make all the difference in the treatment needed.
