I live in lower riberas and I don't think one would get much argument that the water is dirty. After living with the problem for many years I installed a large sand filter and water softener and now the dishwasher, washing machine, faucets, showers and toilets thank me. It was an ongoing and never ending problem with the damage that the sand and grit was doing. As for the sewers. I have seen survey teams in and around the area but don't really know what that means. I have zero problems with my septic tank in the 7 years we have lived here. Never had an overflow nor ever had it pumped. So I suspect it is a hit and miss thing. Personally, I enjoy living here more than upper ajijic where we lived previously. The highway noise, music and fireworks were more abundant in Ajijic.