Any supply which fails to meet the lead or copper action level is required to collect entry point samples representative of source water after treatment. The results of these samples are used to determine whether or not source water treatment needs to be installed or augmented to remove lead and/or copper from source water. Those supplies which are not required to install or augment treatment are not assigned a Maximum Permissible Level (MPL). Supplies with higher levels of Entry Point results must complete a treatment recommendation, submit a formal permit application and begin construction within 24 months after Agency issuance of the construction permit. Follow-up samples must be taken and results submitted within twelve months following installation of treatment; the Agency will then establish an MPL by Special Exception Permit (SEP) for the system.