Conan

I have been advised by my LFS and by an article on aquariumscience.org to use 5X the regular dosage of dechlorinator to treat the chloramine in my water because they say that municipal water supplies, like the one in my city, will spike the chloramine (or chlorine) dosage in response to spring runoff, leaks, storms or bacteria testing without alerting anyone. Does anyone know if this actually happens? It would be really nice to get some clarity on this topic.