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The Qualified Water Efficient Landscaper Reference Manual - Sonoma-Marin Version provides a complete study guide for the Qualified Water Efficient Landscaper (QWEL) professional certification in Sonoma and Marin Counties, California. QWEL is recognized as a US EPA WaterSense labeled Professional Certification Program for Irrigation System Audits. The list of topics covered includes: Where Our Water Comes From Sustainable Landscaping Soils Landscape Water Irrigation Systems Irrigation Maintenance & Trouble Shooting Irrigation System Auditing Irrigation Scheduling Irrigation Controllers Bringing It All Together Please note that there are various versions of the QWEL Reference Manual. Check with your local QWEL Professional Certifying Organization to ensure that you are purchasing the correct version. For further information about the QWEL professional certification visit the QWEL website at www.qwel.net.