W. Va. Code R. § 64-3-7 - [Effective 7/1/2025] Public Water System Disinfection Requirements

7.1. Disinfection with chlorine, chlorine dioxide, chloramine, or ozone is required of all public water systems, provided the requirements of subsection 7.6. of this section are met.

7.2. The disinfectant shall be applied during treatment at a point before entering the distribution system which will provide effective log removal.

7.3. Ground water systems shall install chemical disinfection to provide at least a four-log virus inactivation or removal before or at the first customer, for any ground water source. Monitoring requirements are the same as the federal regulations adopted in this rule.

7.4. Surface water systems and groundwater systems under the direct influence of surface waters shall meet the disinfection requirements of the federal regulations adopted in this rule.

7.5. Chlorine residual testing equipment shall enable measurement of free and total chlorine residuals to the nearest 0.2 milligrams per liter.

7.6. For all public water systems, at least 0.2 milligrams per liter of total chlorine residual shall be maintained throughout the distribution system at all times and shall measure the total chlorine residual at least one time per day when serving water to the public and report the results in accordance with section 12 of this rule.

7.7. The commissioner may authorize exceptions, in writing, in the chlorine disinfection parameters specified in this section. The commissioner may impose additional monitoring requirements if an exception is authorized.

Notes

W. Va. Code R. § 64-3-7