Public water suppliers must complete a materials evaluation of their distribution system and/or review other information to target homes that are at high risk for lead/copper (Pb/Cu) contamination. Monitoring is to be conducted at the tap in these homes, with the number of tap-sampling sites based on the population served. One sample is required at each site.
Additional monitoring for other water quality parameters (WQPs) affecting corrosion is required to optimize treatment and determine compliance with State lead/copper standards. Two types of systems must perform this monitoring under the following conditions:
Two types of sampling sites are specified for this purpose:
Initially, systems must collect home tap samples for lead and copper analysis and samples for other WQPs every six months. In systems that are required to install corrosion control treatment, follow-up samples for other WQPs must be taken from within the distribution system every six months, and from entry points to the distribution system every two weeks. Both the number of sampling sites and the sampling frequency may be reduced if the action level is not exceeded or the systems maintain optimal treatment.
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