Dead Creek NEED Help! Enviornment Problem?

Yesterday while walking by the creek close to my house, i saw that all of the crayfish and earthworms were dead. I counted at least 28 just right there, and the earth worms are all white and littler the substrate. I know crayfish indicate the health of a creek and can be used for biomonitoring. There is a swim club about 30 yards up, and they were fixing the pool or something, so possibly their chlorine water leaked into to the creek? I need help on what to do, i'll take some pics and collect some water samples, as well as contact the State Representative and/or the local EPA. Any suggestions on what else i could do/ ask for?