This British Standard gives recommendations and guidance on how to carry out risk assessments forPseudomonas aeruginosa (PA)and other waterborne pathogens whose natural habitat is within constructed water systems and the aqueous environment (autochthonous) rather than those being present as a result of a contamination event. It includes those pathogens that can colonize and grow within water systems and the associated environment. It does not cover risk assessments forLegionella spp.; these are covered in BS 8580-1, or risk assessments for enteric microorganisms derived from human or animal faecal contamination or sewage ingress.All current amendments available at time of purchase are included with the purchase of this document.