You are not required to replace an individual lead service line if the lead concentration of all samples from the line is less than or equal to 0.015 mg/L. To determine if a lead service line must be replaced. When must a system replace lead service lines? You must recommence lead service line replacement if you subsequently exceed the lead action.You can discontinue lead service line replacement, and thus any need to conduct lead service line monitoring, whenever your 90th percentile lead level is at or below the lead action level for 2, consecutive monitoring periods.There are 3 methods for collecting a lead service line sample: 1) Flushing a specified volume 2) Direct service line samples and 3) Using temperature variation.If you do not replace the privately owned portion of a lead service line (also known as partial lead service line replacement), you must collect a sample that is representative of the water in the service line within 72 hours of the replacement.Please include the following elements in your LSLRP. This critical step will ensure that your program is in compliance with all federal and state requirements. If you are required by MassDEP to initiate lead service line replacement, you must submit a Lead Service Line Replacement Program (LSLRP) to the MassDEP Drinking Water Program for approval within 60 days of the end of the monitoring period and prior to initiating the LSLRP. MassDEP requires it because you have missed your deadline for installing corrosion control treatment or source water treatment. Your 90th percentile lead level exceeds the lead action level in any monitoring period conducted after you install corrosion control treatment or.
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