State law requires districts to address water quality in schools.
Idaho Statutes 33-122 Sanitation - Safety - Cooperation with Other State Agencies.
The state board shall cooperate with the board of health and welfare in establishing regulations covering school building sanitation, sewage disposal, water supply, or other matters affecting the public health, as shall in the opinion of the board be required. It may cooperate with any other department of state government in any matter in which such cooperation will be of assistance in carrying out its duties.
Lead Testing Sampling and Submission Guide
Guide addresses testing protocols to ensure safe drinking water.