My county water district publishes the monthly report of detected levels of all of the regulated items: https://www.valleywater.org/your-water/water-quality/wat

My county water district publishes the monthly report of detected levels of all of the regulated items: https://www.valleywater.org/your-water/water-quality/water-quality-reports https://www.valleywater.org/your-water/water-quality/water-q... They also say that lead is rarely injected into the water supply from the water supplier or water mains, but usually much closer to the home (eg. “Goosenecks”).