Not only can a green pool be an "aesthetic" issue but it can cause health issues.  Stagnant water sources promote mosquito breeding grounds and disease. If you live close to one of these "green pools" there are steps you can take where the green pool can be treated! Contact the Southern Nevada Health District to report the green pool at:  702-759-1633 or fill in this form on this website. Clark County will chemically treat the pool or use "mosquito fish" in the pool to help prevent the stagnating water source from becoming a mosquito breeding ground. This problem has become better since several years ago but is still a problem, nonetheless! 03/03/2010