I think the levels were high in walnut creek that feeds the lake and that the lake itself had not tested high. The city is investing money to try to correct the problem. I'm telling my kids not to go swimming in the lake until they say the levels are safe in the creek just to be sure, even though the where they swim is pretty far from walnut. For fishing, I wouldn't worry about it on the lake, the danger is in contact with the water and you don't get too much water on yourself when you fish. The e coli is in fish intestines, not the meat. That said, I'm not going to try my luck on walnut creek any time soon.