Explain the difference between the two water systems and how this led to lead getting into the water

Lead and copper enter drinking water primarily through plumbing materials. Exposure to lead and copper may cause health problems ranging from stomach distress to brain damage.

Explanation:

Lead can enter drinking water when plumbing materials that contain lead corrode, especially where the water has high acidity or low mineral content that corrodes pipes and fixtures. The most common sources of lead in drinking water are lead pipes, faucets, and fixtures. In homes with lead pipes that connect the home to the water main, also known as lead services lines, these pipes are typically the most significant source of lead in the water.  Lead pipes are more likely to be found in older cities and homes built before 1986.  Among homes without lead service lines, the most common problem is with brass or chrome-plated brass faucets and plumbing with lead solder.

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explanation:

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.