WSO Water Distribution, Grades 3 and 4, is organized into 13 chapters addressing core test content on certification exams. Chapters discuss regulations, operator math and chemistry, and specific distribution processes in detail. Other chapters cover water use and system design, water mains, hydrants and valves, water system supply security and public relations. This textbook is now available in digital format for customers purchasing in bulk. Skip the shipping and the wait: we can provide your operations team or class with instant access to digital textbook rentals. Email firstname.lastname@example.org to take advantage of this new offer.