Last year, the State Water Resources Control Board’s (State Board) adopted a maximum contaminant level (MCL) for 1,2,3-Trichloropropane (TCP) at 5 parts per trillion (ppt). On January 31, the State Board held a meeting to provide an overview of monitoring and testing requirements.
Summary of New Requirements for Community and Nontransient-Noncommunity Water Systems:
- Monitor sources for 1,2,3-TCP and comply with the 5ppt MCL;
- Report all sampling results;
- Data substitution: 1,2,3-TCP water quality monitoring data collected within the two years prior to the date of the MCL may be eligible for initial monitoring requirements;
- Granular Activated Carbon (GAC) has been identified as the Best Available Technology (BAT);
- Water Systems that violate the MCL are required to use specific Consumer Confidence Report languag
For a complete list of requirements, please visit the Division of Drinking Water’s webpage by clicking here.
Initial Quarterly Sampling:
- Initial monitoring began in January, 2018 (January, February, and March);
- Data substitution results from groundwater samples collected during 2016 and 2017 may be eligible for up to three of the four quarters of initial monitoring;
- Each individual source must be sampled – composite samples are not allowed.
Testing waivers are handled by the local Drinking Water Office or Local Primacy Agency.
To download a copy of the presentation, click here.