The Tank That Turned Water Brown Overnight
“Our overhead tank would fill with clear water, but by the next morning, it had turned brown and murky.” That’s how residents of Anna Nagar, Chennai, described the frustration they faced every day. “Even if we drew water late at night, by morning it was brown and left rusty stains on sinks , bathrooms, and utensils. Cooking and drinking with this water became a constant concern. It was not just inconvenient — it was worrying for the whole family,” one resident explained. The problem wasn’t the tank or plumbing. It was the water. The apartment relied entirely on borewell water, which carried high levels of dissolved iron. Why Did the Water Turn Brown Overnight? We asked: “Have you tested the iron level in your borewell water?” The residents hadn’t. When tested, results showed iron levels above 2–3 ppm — enough for water to oxidize quickly and turn brown within hours. Here’s what that means: Dissolved iron oxidizes when exposed to air → water changes from clear to brown. Rust par...