Bids Are Invited For The Presence Of Pigeons In Water Treatment System Installations Represents A Potential Risk To Water Quality, As Well As Public Health, In Addition To Harming The Protection And Quality Of Life Of Workers. ; Pigeons Can Contaminate Water With Feces, Feathers And Other Waste, Containing Bacteria, Viruses And Parasites That Lead To Diseases Such As: Meningitis, Salmonella, Dermatitis And Allergies. Also Considering The Financial Losses In Relation To The Damage Caused To Each Project Through Aesthetic Problems, As The Feces Of These Birds Accumulate And Cause Corrosion To Paintings, Roofs, Metal Surfaces, Pipes And Awnings. ; Therefore, It Is Essential To Implement Control Measures To Prevent Contamination Of Treated Water And Ensure Compliance With The Health And Safety Standards Of The Competent Bodies.;