I was once told that "ten feet offshore and ten feet down" the water would be bacterially safe to drink. With all the people in the water these days I still would be a little squeamish even if I were positive that were true. If you don't have access to a trusted well I'd advise bottled water or looking into purification techniques. At the very least you should have a sediment filter to reduce fouling in your plumbing and water heater.
They used to say to bring water to a boil for 5 minutes to kill any bacteria but now the camping/survival guides say just bringing it to boiling will do it. If you have a fire every evening I'd suggest boiling water on it. To reduce the chance of injury, use a ladle and funnel to move the heated water into appropriate containers.
Those purification pills aren't for permanent use and keep many people close to the outhouse... Reverse osmosis might put too much salt back into the lake than is good for it. The ceramic water filters that back-packers use are great. No chemicals and nothing large enough to be alive can get through them. They won't remove toxins though.
You can use chlorine bleach/tabs but you'd need to research how much to use. The manufacturers won't list this on their packages due to liability issues but if you have the US Army Field Hygiene Manual it tells you how to use bleach as a field expediant material. You can also find this info on the web if you dig hard enough.
And that's (almost) all I think I know about that.
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