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You can download the WHO Water Safety Plan Manual here: https://www.who.int/water_sanitation_health/publication_9789241562638/en/ Water safety plans are also covered in the Sphere Minimum Standards: https://www.spherehandbook.org/en/water-supply-standard-2-water-quality/
Water quality monitoring and surveillance is really dependent on the risks which in turn are dependent on both the source and the users of the water. Can you tell us more about the specific application?