1. Owners of water supply systems serving the public (purveyors) in the Delaware River Basin that distribute water supplies in excess of an average of 100,000 gallons per day (gpd) during any 30-day period shall develop and undertake a systematic program to monitor and control leakage within their water supply system. Such a program shall at a minimum include: periodic surveys to monitor leakage, enumerate unaccounted-for water, and determine the current status of system infrastructure; recommendations to monitor and control leakage; and a schedule for the implementation of such recommendations. Each purveyor's program shall be subject to review and approval by the designated agency in the state where the system is located. "Unaccounted-for water" is defined as the difference between the "metered ratio" and 100 percent. The metered ratio is the amount of water delivered through service meters divided by the amount of water entering the distribution system. The designated state agencies are: Delaware Department of Natural Resources and Environmental Control; New Jersey Department of Environmental Protection; New York Department of Health, and Pennsylvania Department of Environmental Protection.

2. Each purveyor that distributes in excess of one million gallons per day (mgd) shall submit its initial program to monitor and control leakage to the appropriate designated agency within two years and each purveyor that distributes between 100,000 gpd and 1 mgd shall submit its initial program to monitor and control leakage to the appropriate designated agency within five years of the effective date of this regulation or at such earlier date as shall be fixed by the designated state agency. Each purveyor shall prepare and submit a revised and updated program to monitor and control leakage every three years thereafter or at such earlier date as shall be required by the designated state agency. The designated state agency may require more frequent program submission from purveyors with unaccounted-for water that is in excess of 15 percent.

3. Any project approvals hereafter granted pursuant to Section 3.8 of the DRBC Compact or any renewal of a project approval shall be subject to the provisions of this regulation.

4. To avoid duplication of effort and to insure proper enforcement of this regulation, the Executive Director shall enter into administrative agreements with each of the designated agencies authorizing such agencies to administer and enforce the provisions of this regulation to the extent practicable and to adopt such rules and regulations of procedure as may be necessary to insure the proper administration and enforcement of this regulation.

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