Government sampling data provide valuable information about the presence of 1,2,3-trichloropropane (1,2,3-TCP) in the water serving Bonneville County, Idaho. While these data characterize the wider public water system, they cannot specify the concentration present in an individual home’s water supply. This distinction is important as household water conditions may vary due to plumbing materials, private wells, or local sources. Testing your own water is the only way to determine your specific 1,2,3-TCP level.
How a Soil Fumigant Impurity from the 1950s-1980s Reached Deep Groundwater Decades Later
Historical Use of Fumigants and Persistence in Aquifers
1,2,3-TCP is a chlorinated solvent historically linked to soil fumigants used extensively in mid-20th century agriculture. This chemical can leach from treated soils and persist for decades due to its chemical stability, eventually reaching deep groundwater supplies. In Bonneville County, local groundwater sources reflect this legacy, though federal monitoring between 2013 and 2015 found 28 samples with no detections above the reporting level of 0.03 micrograms per liter (µg/L), equivalent to 0.03 parts per billion (ppb).
Granular Activated Carbon Contact Time: Why Bed Depth Matters More for TCP Than for Taste
Effectiveness of Granular Activated Carbon in Treating 1,2,3-TCP
Standard water treatment focusing on taste and odor often uses granular activated carbon (GAC), but the removal of chlorinated solvents like 1,2,3-TCP requires longer contact times within the carbon bed. The depth of the GAC bed significantly influences how well it adsorbs TCP molecules, which are smaller and more challenging to capture compared to taste- or odor-causing compounds. Selecting treatment technologies with sufficient carbon bed depth optimizes the reduction of TCP in residential water supplies.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
Interpreting EPA Occurrence Data for Bonneville County’s Public Water System
The public water system serving Bonneville County reported 28 measurements of 1,2,3-TCP during the EPA’s Unregulated Contaminant Monitoring Rule 3 (UCMR3) survey with no values exceeding 0.03 µg/L detection limits. This means that either the chlorinated solvent was not found or was below the level the instrument could quantify. Since no maximum contaminant level (MCL) has been established federally for 1,2,3-TCP, these readings reflect occurrence, not a violation or health-based concern. Homeowners should consider this data as context, not definitive information for their own tap water.
Why the Reporting Level for This Solvent Is Thousands of Times Lower Than for Common Metals
Analytical Sensitivity and Regulatory Differences
Measuring 1,2,3-TCP requires detection capabilities far more sensitive than those for many common metals. The reporting level of 0.03 µg/L is extremely low compared to metal thresholds often set in the micrograms per liter or milligrams per liter range. This sensitivity arises because 1,2,3-TCP is a synthetic organic compound of concern for its persistence and potential long-term effects. However, absence of a federally enforceable MCL means detected levels in water are treated as occurrence data rather than regulatory exceedances.
How the Treated Water Differs at the Tap Once the Documented Technology Is in Place
Enhancing Household Water Quality with a Specialized Filter
Using a targeted technology such as the Pentair 1,2,3-TCP Filter, which employs optimized granular activated carbon for this contaminant, can lower the presence of chlorinated solvents in residential water. This filter ships ready to configure, facilitating household use without requiring specialized services. Once in place, water passing through such a filter typically exhibits reduced levels of 1,2,3-TCP, affecting water quality aspects associated with this solvent. Though the public water system records show no health-based violations, this added step may provide peace of mind for residents wishing to address this compound specifically.
How Public-System Records Differ from Private-Well Testing in What They Establish
Scope and Limitations of Government Data
Public water system records represent aggregated data from a centralized supply serving tens of thousands of people, including the City of Idaho Falls system in Bonneville County. These findings do not translate directly to individual household water profiles, especially for private wells that draw from different aquifers or have distinct exposure risks. Private well owners should order comprehensive testing to assess constituents like 1,2,3-TCP within their specific water before selecting any treatment device.
Next Step: Order a certified laboratory test measuring 1,2,3-trichloropropane concentration in your household water. If results show measurable TCP above detection limits, considering a Pentair 1,2,3-TCP Filter may address your treatment needs effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-04-07. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for City of Idaho Falls (ID7100039), ID: 28 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level