S.C. Code § 44-23-1130
The Department of Mental Health shall make investigations and ascertain which of the patients or trainees of State mental health facilities or which of the parents, guardians, trustees, committees or other persons legally responsible therefor are financially able to pay the expenses of the care and treatment, and it may contract with any of these persons for a patient's or trainee's care and treatment. The Department of Mental Health may require any county or State agency which might have or might be able to obtain information which would be helpful to it in making this investigation to furnish this information upon request. In arriving at the amount to be paid the Department of Mental Health shall have due regard for the financial condition and estate of the patient or trainee, his present and future needs and the present and future needs of his lawful dependents, and whenever considered necessary to protect him or his dependents may agree to accept a monthly sum less than the actual per capita cost.
S.C. Code § 44-23-1130