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Common Misunderstandings About 1,2,3-TCP Presence in Your Water

A frequent misconception is that detecting 1,2,3-trichloropropane (TCP) above laboratory reporting levels in an area's water supply equates to a direct threat at every household or a failure of existing equipment. Regional water system data, however, reflect broad monitoring results and do not represent any single home's water quality. For Utah County residents, relying solely on local detection figures without individual water testing can lead to inaccurate conclusions about household water conditions.

How a Mid-20th Century Soil Fumigant Byproduct Appears in Groundwater Today

1,2,3-trichloropropane originated as an impurity in soil fumigants used extensively from the 1950s through the 1980s. Over time, this chlorinated solvent leached through soil layers and eventually reached deep groundwater reserves. The contamination process is gradual and influenced by soil composition, rainfall patterns, and regional agricultural practices. Decades later, traces of 1,2,3-TCP remain measurable in certain groundwater sources, including those supplying Utah County's public water systems.

Agricultural Land-Use History's Role in Regional 1,2,3-TCP Detections

Utah County's past agricultural activities have shaped patterns of 1,2,3-trichloropropane detections. Areas with intensive farming during the mid-1900s, where soil fumigants were applied, correspond to locations where groundwater sampling has been conducted. While public water system records for Springville City—a groundwater source serving over 35,000 residents in the area—show no detections of 1,2,3-TCP above the method reporting level, the historical application patterns suggest the need for ongoing vigilance and targeted monitoring.

Influence of Sampling Depth, Well Depth, and Water Source Type on Detection Expectations

Understanding the depth at which water samples are taken is crucial. Groundwater drawn from deeper wells may show different contaminant profiles compared to shallow aquifers. For Utah County, the Springville City water system relies on groundwater wells, but the exact depth and location of each well influence the likelihood of detecting 1,2,3-TCP. Therefore, regional data from public water systems cannot substitute for a well-specific test that considers these factors.

Interpreting Detection Data Relative to Federal Standards

Between 2013 and 2015, Springville City's public water system recorded zero detections of 1,2,3-trichloropropane above the 0.03 micrograms per liter (µg/L) reporting level, equivalent to 0.03 parts per billion (ppb). Notably, there is no established federal Maximum Contaminant Level (MCL) for this chlorinated solvent, meaning detected concentrations cannot be labeled as regulatory violations or health hazards solely based on presence. Additionally, the system's record includes two health-based violations unrelated to 1,2,3-TCP, underscoring that this solvent has not contributed to compliance issues.

Sample Size and Its Effect on Data Reliability

The monitoring results for 1,2,3-trichloropropane in the Springville water system are based on 20 samples collected over a seven-month period. While this provides an informative snapshot, the relatively small number of samples might not capture transient changes or localized differences within the entire water supply network. Residents should consider this limitation when interpreting the data and assess the value of individual water testing to inform their household water treatment needs.

Summary and Decision Guidance

Regional monitoring in Springville City, Utah County, shows no detections of 1,2,3-trichloropropane above federal laboratory reporting levels and no federal MCL violations related to this constituent. However, historical land use and the nature of groundwater contamination warrant individual water testing to ascertain household conditions.

For residents whose existing water treatment equipment struggles to keep pace with 1,2,3-TCP or similar chlorinated solvents, evaluating advanced solutions such as those based on the Fleck technology may offer a tailored response, as it ships ready to configure and is documented to address these concerns effectively.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-01-12. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Springville City (UTAH25005), UT: 20 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level