Washington Administrative Code › Title 246 - Health, Department of › WATER SYSTEMS › Chapter 246-290 - Group A public water supplies › Part 3 - DESIGN OF PUBLIC WATER SYSTEMS › Section 246-290-220 - Drinking water materials and additives

Current through Register Vol. 24-14, July 15, 2024
(1) All materials shall conform to the
				  ANSI/NSF Standard 61 if in substantial contact with potable water supplies. For
				  the purposes of this section, "substantial contact" means the elevated degree
				  that a material in contact with water may release leachable contaminants into
				  the water such that levels of these contaminants may be unacceptable with
				  respect to either public health or aesthetic concerns. It should take into
				  consideration the total material/water interface area of exposure, volume of
				  water exposed, length of time water is in contact with the material, and level
				  of public health risk. Examples of water system components that would be
				  considered to be in "substantial contact" with drinking water are filter media,
				  storage tank interiors or liners, distribution piping, membranes, exchange or
				  adsorption media, or other similar components that would have high potential
				  for contacting the water. Materials associated with components such as valves,
				  pipe fittings, debris screens, gaskets, or similar appurtenances would not be
				  considered to be in substantial contact.
(2) Materials or additives in use prior to
				  the effective date of these regulations that have not been listed under
				  ANSI/NSF Standard 60 or 61 may be used for their current applications until the
				  materials are scheduled for replacement, or that stocks of existing additives
				  are depleted and scheduled for reorder.
(3) Any treatment chemicals, with the
				  exception of commercially retailed hypochlorite compounds such as unscented
				  Clorox, Purex, etc., added to water intended for potable use must comply with
				  ANSI/NSF Standard 60. The maximum application dosage recommendation for the
				  product certified by the ANSI/NSF Standard 60 shall not be exceeded in
				  practice.
(4) Any products used to
				  coat, line, seal, patch water contact surfaces or that have substantial water
				  contact within the collection, treatment, or distribution systems must comply
				  with the appropriate ANSI/NSF Standard 60 or 61. Application of these products
				  must comply with recommendations contained in the product
				  certification.
(5) The department
				  may accept continued use of, and proposals involving, certain noncertified
				  chemicals or materials on a case-by-case basis, if all of the following
				  criteria are met:
(a) The chemical or
				  material has an acknowledged and demonstrable history of use in the state for
				  drinking water applications;
(b)
				  There exists no substantial evidence that the use of the chemical or material
				  has caused consumers to register complaints about aesthetic issues, or health
				  related concerns, that could be associated with leachable residues from the
				  material; and
(c) The chemical or
				  material has undergone testing through a protocol acceptable to the department
				  and has been found to not contribute leachable compounds into drinking water at
				  levels that would be of public health concern.