WAC 173-160-214. What are the limitations for use of drilling materials?

(1) At no time shall a product contain materials that: (a) Are toxic or polluting; (b) Develop odor or color changes in the water; or (c) Serve as a microbial nutrient. (2) Organic materials which foster or promote undesired organic growth or have the potential to degrade water quality shall not be employed in the construction of a water supply well. This includes, but is not limited to, brans, hulls, grains, starches, and proteins, unless NSF/ANSI approved.