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1,2,3-Trichloropropane (TCP)

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The State of California recently proposed a new Maximum Contaminant Level (MCL) of 5 ppt for 1,2,3-Trichloropropane (TCP). TCP is a known carcinogen, primarily found in groundwater. TCP is used as an industrial solvent, soil fumigant and degreaser in manufacturing processes.

The newly proposed California MCL is being recommended at the current State Notification Level (NL) and will result in a lifetime cancer risk reduction of 1 in 142,857 persons based on a lifetime average drinking water intake (2 liters of water per day for 70 years). The anticipated cost to California water systems to implement this new regulation is estimated to be more almost $30m annually

To comply with the new MCL, California water systems are required to conduct initial quarterly monitoring for TCP beginning January 1, 2018. Compliance will be based on a Running Annual Average (RAA) of 4 consecutive quarters of data. Grandfathering of up to 3 quarters from data collected no more than two calendar years prior to the effective date of the final rule is allowed. However, systems that grandfather data must collect at least 1 quarter of initial monitoring. Fiscal impact to systems >200 service connections is estimated to be $475k annually and fiscal impact to systems <200 service connections is estimated to be $25k annually.

Granular Activated Carbon (GAC) has been designated as the best available technology for treating TCP. GAC has proven to be reliable and cost-effective in removing TCP down to the NL and removing TCP from both water and air.

Eurofins Eaton Analytical performs TCP analysis with a 5 ppt reporting limit, which is the State’s designated Detection Limit for Reporting (DLR) for the proposed MCL. We can also report data down to the Office of Environmental Health Hazard Assessment (OEHHA) Public Health Goal (PHG) which is 0.7 ppt.

For questions regarding the TCP regulation, analysis or treatment, please contact Eurofins Eaton Analytical.