Principles and practices of environmental sanitation, including water supply, sewage, industrial waste and refuse handling and disposal, housing and recreational sanitation, air pollution, vector control, food handling and processing, and solid waste management; Provisions of the Health and Safety Code; General principles and practices of public health; Sanitation provisions of the California Health and Safety Code, Administrative Code and related legal provisions; Methods and procedures used in inspecting, investigating and correcting unsanitary conditions; Principles and practices of environmental sanitation and sanitary science, and principles and practices of public health; Penal Code relating to public nuisances; Basic water works construction features, such as sewage disposal systems, swimming pools, and wells, sufficient to evaluate plans; and. Effectively instruct individuals and groups on the principles and reasons for a safe and healthy environment; Understand and interpret laws, rules and regulations; Read and understand construction plans and blueprints involving numerous mathematical computations; Speak effectively before groups; Write and verbally communicate instructions for correction of deficiencies and violations in a clear and concise manner; Plan, organize and carry out complex environmental health studies and reports; Oversee investigations; Respond effectively to complaints from the public; and.