I believe it is the water and not the drain pipe because I filled a glass and walked away from the sink but still smelled the odor from the glass. On Thursday the 18th, we shut down water to the house and drained the pipes. We turned the water back on Friday the 19th and, since then, I have noticed a "swampy" smell to the water. After the boil water notice, I ran all of the faucets (both hot and cold) for 1-2+ minutes each but the odor is still there.