To be considered a failing public water system for the purposes of RCW 90.03.570, the department of health, in consultation with the department and the local health authority, must make a determination that the system meets one or more of the following conditions: (1) A public water system has failed, or is in danger of failing within two years, to meet state board of health standards for the delivery of potable water to existing users in adequate quantity or quality to meet basic human drinking, cooking, and sanitation needs or to provide adequate fire protection flows; (2) The current water source has failed or will fail so that the public water system is or will become incapable of exercising its existing water rights to meet existing needs for drinking, cooking, and sanitation purposes after all reasonable conservation efforts have been implemented; or (3) A change in source is required to meet drinking water quality standards and avoid unreasonable treatment costs, or the state department of health determines that the existing source of supply is unacceptable for human use.
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