Understanding 1,2,3-TCP in Aiken's Graniteville Area Water Supply
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Whole House 1,2,3-TCP Reduction Water Filter System - Trichloropropane Removal
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Why Is the Reporting Level for 1,2,3-TCP Much Lower Than for Common Metals?
1,2,3-trichloropropane, often abbreviated as 1,2,3-TCP or simply TCP, is a chlorinated solvent not naturally found in water. Its reporting level, the smallest concentration measurement recorded by government tests, is set in micrograms per liter (µg/L) or parts per billion (ppb). For TCP, this level is 0.03 µg/L, which is thousands of times lower than detection thresholds for common metals like lead or copper. This low reporting level reflects the need for sensitive instruments to monitor even trace amounts of this solvent due to its industrial history and potential persistence in groundwater.
How Did a Soil Fumigant Impurity from the Mid-20th Century Reach Deep Groundwater Decades Later?
1,2,3-TCP was historically an impurity in soil fumigants used primarily from the 1950s through the 1980s. Because it is chemically stable and does not easily break down, TCP has migrated slowly through soil layers over time. This movement can lead to its presence in deeper groundwater and surface water sources long after its original use. In Graniteville and the wider Breezy Hill Water District, which sources from surface water, any trace TCP detected reflects this legacy contamination rather than recent local use.
What Does the Measured Range Mean Against the Federal Standard, and What Does It Not Mean?
The Environmental Protection Agency (EPA) does not currently have a maximum contaminant level (MCL) for 1,2,3-trichloropropane, meaning there is no legally enforceable federal limit. In the Breezy Hill Water District, federal monitoring under the Unregulated Contaminant Monitoring Rule (UCMR3) recorded 14 samples between early 2013 and late 2013 with zero detections above the reporting level of 0.03 µg/L. This means the chlorinated solvent, if present, was below the smallest amount these tests could confirm, but it does not imply absence in every household or plumbing system. Importantly, the absence of a detection above the reporting level is not equivalent to a safety or health violation, and the water system has no EPA health-based violations on record.
How to Compare This Area's Record with a Neighboring County's Without Overreading It
Comparing 1,2,3-TCP detection records between nearby regions requires care because each water system's source and history differ. A neighboring county might rely on groundwater wells or have different industrial legacies affecting TCP presence. Breezy Hill Water District's surface water source tends to dilute contaminants differently than groundwater systems. Thus, differing detection results between Aiken County and adjacent counties do not automatically indicate that one area’s water is better or worse. They reflect distinct water sources, testing scopes, and geological conditions.
What Distinguishes 1,2,3-TCP from the Two Problems Most Often Confused with It?
1,2,3-TCP is often confused with other chlorinated solvents, such as trichloroethylene (TCE) or dichloropropane, but these compounds differ in chemical structure, sources, and treatment behavior. TCP's low detection threshold and persistence make it unique, especially since it resists common treatment methods like air stripping. It does not form from household plumbing corrosion or from typical disinfection byproducts, which are separate water quality concerns entirely.
What Do 'Detected', 'Median', and 'Range' Mean in the Sampling Record on This Page?
In the EPA monitoring data, 'detected' means an instrument measured the compound at or above the specified reporting level—in this case, 0.03 µg/L—for 1,2,3-TCP. The 'median' is the middle value among all measurements but is not applicable here because no detections were found. The 'range' describes the span between the lowest and highest recorded concentrations. Since all results were below detection, the range indicates non-detectable levels, not the absence of TCP everywhere in the water system.
What Is the Single Test You Should Order to Clarify Your Household's Situation?
If you want to know whether 1,2,3-trichloropropane is present in your home's water supply, the only definitive method is to conduct a laboratory test on your own water. Such tests measure TCP concentrations in micrograms per liter or parts per billion, directly revealing your household's condition. This single test will settle the question better than relying on regional sampling data alone, which cannot determine individual home water quality.
Should the test reveal concentrations of concern, water-treatment equipment designed to reduce chlorinated solvents, such as the Autotrol 1,2,3-TCP Filter, can be obtained. This system ships ready to configure and is documented as addressing this specific solvent effectively, providing a residential option if needed and confirmed by your testing.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2013-10-14. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Breezy Hill Water District (SC0220006), SC: 14 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level