The Roswell Municipal Water System in Chaves County, New Mexico, serving over 54,000 residents, has undergone federal monitoring for 1,2,3-trichloropropane (TCP), a chlorinated solvent with potential health implications. Between 2013 and 2015, extensive sampling found no detections of TCP above the reporting level of 0.03 micrograms per liter (µg/L), or 0.03 parts per billion (ppb). This page outlines six technical considerations for households weighing treatment options to address 1,2,3-TCP.
1. Granular Activated Carbon Contact Time: Why Bed Depth Matters More for TCP Than for Taste
Granular activated carbon (GAC) filters can adsorb chlorinated solvents like TCP from water, but the efficiency depends heavily on contact time within the carbon bed. For TCP, which is more challenging to remove than typical taste or odor compounds, a deeper carbon bed means longer contact times, improving contaminant adsorption. Thus, when evaluating treatment setups, consider that the carbon bed depth plays a crucial role in TCP interaction, more so than it does for aesthetic water concerns.
2. How California's 5 ng/L State Limit Compares With the Absence of a Federal MCL
California enforces a stringent state maximum contaminant level (MCL) of 5 nanograms per liter (ng/L) for 1,2,3-TCP, equating to 0.005 µg/L, a level considerably lower than the federal reporting threshold. In contrast, there is currently no federal MCL for TCP. This difference means that while federal monitoring documents occurrences at or above 0.03 µg/L, some states apply more conservative standards. For households in Roswell, understanding both federal monitoring and specific state guidelines can inform treatment decisions.
3. How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The published data for Roswell's water system included 26 samples across groundwater sources during the UCMR3 federal occurrence survey. The absence of detections above the 0.03 µg/L reporting level reflects monitoring results from multiple wells over several months, not a single well test or continuous measurement. As a result, individual household water quality could vary, and only a direct laboratory test on household water can accurately determine the TCP concentration at the tap.
4. How to Judge Treatment Capacity Against the Household's or Facility's Daily Demand
Treatment capacity is an important factor when selecting equipment designed to address TCP. The equipment must handle the volume of water your household consumes daily to maintain water quality consistently. Underestimating demand can reduce effectiveness, while equipment sized for higher capacity may offer longer service intervals. Assess household water use profiles to match treatment capability appropriately.
5. How the Treated Water Differs at the Tap Once the Documented Technology Is in Place
Water passing through tested and certified treatment media designed for TCP will demonstrate lowered or non-detectable levels of this chlorinated solvent at the tap. Unlike taste or odor improvements, the primary difference is in the chemical profile, specifically the reduction of the TCP concentration. The resulting treated water maintains the original water's aesthetic and mineral qualities, but with reduced presence of this particular chlorinated solvent.
6. The Order in Which to Rule Things Out, From Cheapest Check to Laboratory Test
Begin by reviewing publicly available water quality reports for Roswell’s municipal system to understand baseline conditions. Next, inspect household plumbing and water usage habits, as plumbing can influence water quality. For specific concerns about 1,2,3-TCP, conducting a professional laboratory analysis of household water samples is the definitive way to determine actual TCP concentrations, as area-wide data cannot substitute for individual results.
These six steps provide a roadmap for homeowners in Roswell, Chaves County, NM, as they consider technical approaches to managing 1,2,3-trichloropropane in their water. The municipal system’s monitoring record shows no detections in the federal survey, offering context but not individual water quality assurance. For more details or confirmation, consult official environmental databases such as the EPA’s Safe Drinking Water Information System (SDWIS) public water system records.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2013-10-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Roswell Municipal Water System (NM3520203), NM: 26 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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