Parenteral Drug Association - Technical Report No.: 4, Design Concepts for the validation of Water for Injection System. Parenteral Drug Association - Technical Report No.:13 Rev 2, Fundamentals of an Environmental Monitoring Program. Water for Pharmaceutical Purposes USP <1231>. Alert level: are levels or ranges that when exceeded, indicate that the process may have drifted from its normal operating condition. Alert level constitutes a warning, necessary investigation has to be done, may not require a corrective action. Action level: are levels or ranges that, when exceeded, indicate that the process has drifted from its normal operating range. Exceeding an action level, necessary investigation shall be performed and Corrective Action and Preventive Action (CAPA) shall be taken as appropriate. PRETREATED/ POTABLE/DRINKING WATER GENERATION AND DISTRIBUTION SYSTEM (NEW SYSTEM) = Feed water for purified water system Pre-treated water from ...