Heavy Metal Contamination
Heavy Metal Contamination is when harmful metals like lead or copper get into water and make it unsafe.
A glass of water sits on the counter with tiny dark dots settled at the bottom. Those dots are the heavy metals. They are too small to see or taste, but they are there. Safe water has no dots, while bad water has dots mixed all through it.
Explaining heavy metal contamination by grade level
Old pipes in some homes have lead in them. Water flows through those pipes each day. Tiny bits of lead mix into the water. You can test the water to find out if lead is there.
Projects that explore heavy metal contamination
When harmful metals like lead get into tap water, the source often traces back to the pipes themselves. In this experiment, you collect water samples from five houses less than 10 years old with PVC plumbing and five houses more than 50 years old with lead pipes. After letting each tap run for 30 seconds, all ten bottles go to an independent lab for lead testing. The results are stark: older houses with lead plumbing show much higher lead levels than newer homes with PVC pipes.
Antifouling paint on boat hulls contains heavy metals — copper, lead, and zinc — that slowly dissolve into surrounding water. To measure how much leaks out, you collect water samples from four locations: a boatyard, a marina, a beach, and a tap. You label small glass bottles for each site, fill them, and send them to a lab for heavy metal testing. The boatyard water contains far more copper, lead, and zinc than any other location, showing how industrial sites can spread contamination into nearby water.