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Chloramines and free chlorine must be removed by the water system’s carbon filtration because oxidants can cause hemolysis, methemoglobinemia, and severe patient harm. A result above the allowable limit constitutes an immediate hazard. The appropriate response is to stop treatments and return each patient’s blood per protocol to avoid exposure, then remove the affected water loop or carbon banks from service and follow the facility’s emergency water treatment procedure (e.g., switch to redundant carbon tanks or install fresh carbon as trained/authorized). Retesting after corrective action is mandatory; dialysis cannot resume until results are within limits. The RN, biomedical personnel, nephrologist, and leadership should be alerted, and an incident report initiated. Adjusting dialysate composition (B) does not neutralize oxidants; continuing (C) is dangerous. Changing dialyzers (D) addresses none of the water quality issues. Thorough documentation—including test results, actions, retest values, and clearance to resume—is required for regulatory compliance, patient safety, and quality assurance. Preventive measures include frequent testing at defined intervals and maintaining proper carbon bed contact time.