1) It can be chemically analyzed in a lab. There are labs that do this kind of thing for a fee.
2) Your local authority (municipality) and/or your water company (utility) has this information. By law, they must keep track of what the local water contains. Give them a call.
lead has much higher density
Drinking too much water after eating will probably lead to a stomache ache and possibly vomiting. Consuming too much water throughout the day can lead to water intoxication, which is a serious condition.
Lead (11,34 g.cm^-3) has a greater density than water (1 g.cm^-3) so for the same volume of water and lead, lead will be heavier. The "-3" should be written as an exponent but it won't allow me
Death. Too much water can be fatal, as it dilutes the body's blood chemicals (electrolytes).
The same as above the water. Lead is a dense metal and has no bouyancy at all.
A cubic foot of cast lead weights 708 pounds.
Too much lead can damage our liver. High concentrations of this metal in water reservoirs is not a good thing for the marine life. Excessive lead consumption can cause many serious effects.
If you drop liquid lead into cold water, the lead can freeze in a tiny fraction of a second. (This will vary depending on the quantity of lead involved.)
Water has much higher specific heat than lead. All metals have fairly low specific heat values.
No, water will not leach the lead from lead glass.
No, you shouldn't even put tap water into a lead acid battery. Most if not all lead acid batteries sold today are advertized as "maintenance-free", but if you do find that you need to add water, use only distilled water.
Seeds need plenty of sunlight and water for them to bloom. However, too much water will drown the seed and it won't blossom.