When you go into the power or water data views you can see your coverage, the good thing i find is that you only need to connect the power to an occupied tile and it will automatically spread power to all other tiles connected to that.
With water pipes im sorta doing what i did in Simcity4 and making them follow the roads, that way i wont get lost with them when the city gets bigger.
Due to my zones being well spread out at the start i basically stuck a wind turbine for my industrial plot and a separate couple for my residential / commercial areas, that way i can manage the power needs of each area separately.
Also for the water make sure you put your water pumps upstream from your drainage pipes.
ahh cool, that makes sense.
are the pipes required then?