The purveyor shall provide consumer information to the water system users within twenty-one days of receipt of confirmation sample results when the department determines that a substance not included in this chapter is confirmed at a level greater than a SAL.

(1) Consumer information shall include:

(a) Name and level of chemical detected;

(b) Location where the chemical was detected;

(c) Any health effects that the chemical could cause at its present concentration;

(d) Plans for follow-up activities; and

(e) The purveyor's name and telephone number.

(2) Consumer information shall be distributed by any of the following methods:

(a) Notice placed in a daily newspaper of general circulation or in a weekly newspaper of general circulation if a daily newspaper does not serve the affected area;

(b) Direct mail to consumers;

(c) Posting for at least one week if a NTNC system; or

(d) Any other method approved by the department.