ABSTRACT
The greatest potential hazard in distribution systems is associated with cross-connections to nonpotable waters. There are many connections between potable and nonpotable systemsevery toilet constitutes such a connection-but cross connections are those through which backflow can occul: Facilities which are particularly likely to have cross-connections through which dangerous materials can enter the distribution system include hospitals, metal plating and chemical plants, car washes, laundries, and dye works. l'
14.1 INTRODUCTION
0 NE of the primary functions of the waterworks operator is to ensure that water under his or her care is kept from being contaminated. Putting great effort into treating water for public consumption, then allowing it to become contaminated before it is used makes little sense. However, after having stated the obvious, we point out that water contamination is not always so obvious, and often prevention of contamination is beyond the waterworks operator's control.
