Why the Reporting Level for 1,2,3-Trichloropropane Is Much Lower than for Common Metals
The detection threshold, known as the reporting level, for 1,2,3-trichloropropane (TCP) in water is set at 0.03 micrograms per liter (µg/L), equivalent to parts per billion (ppb). This is thousands of times lower than levels used for many metals because TCP is a volatile organic compound with potential long-term health considerations, influencing monitoring sensitivity. For South Bend Waterworks, which supplies groundwater to 115,000 people in 46,000 connections, no TCP has been reported above this sensitive threshold during the 2013-2015 federal survey. It is important to understand that this low reporting level reflects precautionary measurement standards rather than a threshold denoting safety or health violations.
The Agricultural Land-Use History of the Region and Its Connection to Detected TCP
St. Joseph County's groundwater reflects the historical land use, especially agricultural practices from the mid-20th century. TCP originated as an impurity in soil fumigants used chiefly between the 1950s and 1980s. Traces of this chlorinated solvent can persist and slowly migrate into aquifers decades later. However, the South Bend Waterworks system's groundwater source continues to show no detections above the reporting level, indicating minimal recent impact from past agricultural use. While agricultural legacy influences regional groundwater composition, this does not confirm the presence or concentration in any individual household's water.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
The monitoring record for South Bend Waterworks includes 18 samples for 1,2,3-TCP, all below the 0.03 µg/L reporting level. This means the median and range for this constituent effectively register as nondetect in the official documentation. For a homeowner, this indicates that the public supply system did not measure TCP above the threshold in that period. Nevertheless, individual well testing remains the only accurate way to determine one's own water quality regarding this chlorinated solvent.
How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The dataset for TCP in the South Bend Waterworks system during 2013-2015 includes 18 discrete samples, representing a snapshot across groundwater-supplied tap water connections. This sample size provides reasonable coverage of the system's public water but cannot pinpoint variability in private wells or plumbing specifics. A small number of samples means localized variations may go undetected. Therefore, households not served directly by this system or with unique water sources should consider specific testing for accurate assessment of 1,2,3-trichloropropane levels.
How the Documented Treatment Technology Addresses 1,2,3-Trichloropropane
For households evaluating water treatment options to address 1,2,3-TCP, certain equipment technologies can reduce or neutralize this chlorinated solvent effectively. The Autotrol 1,2,3-TCP Filter employs a targeted approach designed to treat water directly at the point of use. It ships ready to configure and operates without additional infrastructure changes. This technology provides a direct method for households to manage concerns about TCP presence, regardless of public system monitoring results, by filtering the water before consumption.
How 1,2,3-Trichloropropane Enters Groundwater or the Distribution System in This Region
In St. Joseph County, groundwater sources can carry residues of 1,2,3-trichloropropane primarily due to historic agricultural fumigation practices. The chlorinated solvent is a legacy contaminant that moves slowly through soil and aquifer sediments. Contamination in the distribution system is unlikely given the water system's groundwater sourcing and treatment protocols. Still, any migration or leaching from older infrastructure would be site-specific and not reflected in the systemwide monitoring data. Understanding these pathways helps households decide whether additional point-of-use solutions are appropriate.
In summary, the public water system record for South Bend Waterworks provides a comprehensive view for residents served by this municipal supply, showing no detections of 1,2,3-TCP above its sensitive reporting level over the 2013-2015 survey period. This data covers a large community supplied by groundwater but does not replace the necessity for individual water testing when considering specific treatment needs. For direct household use, the Autotrol 1,2,3-TCP Filter offers a practical option that ships ready to configure, providing targeted management of this particular chlorinated solvent. More information is available through the EPA's public water system occurrence data.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-04-02. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for South Bend Waterworks (IN5271014), IN: 18 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level