city may be the first to mandate saving... by changing the way houses are built. d save water. one bay area city may be the first to mandate saving by changing the way houses are built. good evening. i'm veronica de la cruz. >> and i'm ken bastida. pal oe -- palo alto would require so called purple pipes to recycle water in the home. the plan and pushback. >> communities across california are looking for ways to better manage their limited supply of water. the city of palo alto specifically looking at its building code, proposing something that's not common in how houses are built now but seems to be common sense in the