HOW TO HAVE A SAFE WATER SUPPLY How much does a glass of water cost? Some oŁ you will answer, "Nothing." That is true in a few places where safe water bubbles up from a spring. But in almost every place water costs something. The story is told of a merchant traveling through the desert-who, when his water supply was gone, paid for a drink of water in diamonds. The glass of water that you get from your own well or pump costs very little—just a fraction of the first cost of the well or pump. Perhaps your father pays a water tax. Ask him whether he does. This tax helps to pay the cost of providing safe water for all the people. Where can you get safe water? Since everyone must have water, it is very important to make it safe, no matter how much it costs. Safe water is always cheaper in the end than sickness. Bacteria that cause disease find their way into drinking water in hundreds of ways. But there are just as many ways of guarding against them. The town or city or county government plays a part in making water safe. The school has its responsibility. Your father and mother have a part to play. You have a share, too, in securing safe water. If you live in a city, you depend upon the city to supply safe water. All cities today make sure that the water is safe to drink. Most cities filter * the water and treat it with chlorine. Filtering strains out dirt of all kinds. Chlorine kills bacteria quickly. You can sometimes taste the chlorine in the water of cities that use it to make water safe. But commonly city water tastes like cool spring water from high up in the mountains. The school has an important responsibility in provid- 77