A. The director shall adopt rules which prescribe minimum standards for the:

1. Sanitary facilities and conditions that shall be maintained by any public water system.

2. Chemicals, additives and drinking water system components that come into contact with drinking water that is used by any domestic or industrial water supply and that is sold or distributed to the public.

B. Chemicals and additives certified as conforming to the national sanitation foundation standards comply with the standards required by this section.

C. In those instances where chemicals, additives and drinking water system components that come into contact with drinking water are essential to the design, construction or operation of the drinking water system and have not been certified by the national sanitation foundation or have national sanitation foundation certification but are not available from more than one source, the standards shall provide for the use of alternatives which include:

1. Chemicals and additives composed entirely of ingredients determined by the environmental protection agency, the food and drug administration or other federal agencies as appropriate for addition to potable water or aqueous food.

2. Chemicals and additives composed entirely of ingredients listed in the national academy of sciences water chemicals codex.

3. Chemicals, additives and drinking water system components consistent with the specifications of the American water works association.

4. Chemicals, additives and drinking water system components that are designed for use in drinking water systems and that are consistent with the specifications of the American society for testing and materials.

5. Drinking water system components that are historically used or in use in drinking water systems consistent with standard practice and that have not been demonstrated during past applications in the United States to contribute to water contamination.

D. Except as identified by the department as an alternative in accordance with this section at or after the time of use or installation, drinking water system components installed and used after January 1, 1993 shall conform to the national sanitation foundation standards.

E. The director of the department of environmental quality may consult with the director of the department of health services in developing the standards prescribed by this section.

F. For the purposes of this section, "drinking water system components" means equipment and materials that are used in a drinking water system, including process media, protective materials, joining and sealing materials, pipes and related products, mechanical devices and mechanical plumbing devices.