If you see 1,2,3-TCP detections in public water system data, what does it mean?
The EPA’s unregulated contaminant monitoring found 1,2,3-trichloropropane, a chlorinated solvent, detected in 5 of 45 samples for the Lihue-Kapaa public water system in Kauai County, Hawaii. The highest measured concentration was 0.086 micrograms per liter (µg/L), or parts per billion (ppb). This system, serving over 34,000 people, has no EPA health-based violations recorded. Such detections indicate the presence of the constituent but do not indicate a violation or unsafe condition. Individual home water tests are necessary to know specific well or tap water concentrations.
If your treatment equipment has not handled 1,2,3-TCP, why does granular activated carbon bed depth matter more here than for taste issues?
1,2,3-trichloropropane is a small, chlorinated organic molecule that challenges standard water treatment due to its chemical stability. For granular activated carbon (GAC) systems, the contact time between water and GAC, largely dependent on bed depth, determines how effectively TCP molecules adsorb onto the carbon. Unlike aesthetic issues such as taste and odor compounds—which often respond well to shorter contact times—TCP requires longer contact time to reduce its presence in water. This means that deeper GAC beds or configurations that maximize contact lead to more effective treatment for 1,2,3-TCP.
If 1,2,3-TCP resists air stripping, what treatment approaches does that influence?
Air stripping relies on volatizing compounds from water into air; however, 1,2,3-trichloropropane’s chemical characteristics prevent effective removal by this method. Its low volatility and resistance to volatilization mean air stripping is not practical for reducing TCP levels. Treatment choices must focus on adsorption technologies, such as specifically configured carbon filtration systems designed for organochlorine compounds, or other advanced methods proven effective against this chlorinated solvent.
If 1,2,3-TCP originated as a soil fumigant impurity decades ago, how did it come to groundwater now?
Historical agricultural use of soil fumigants containing 1,2,3-trichloropropane as an impurity was common from the 1950s through the 1980s. The persistence and mobility of this compound in the subsurface environment mean that contamination reaching deep groundwater can be delayed by decades. This lag explains its detection in water supplies today despite discontinued use long ago. Understanding this timeline is important for assessing long-term water quality trends in Kauai County’s Lihue-Kapaa area.
If government sampling shows 1,2,3-TCP ranging up to 0.086 µg/L, what does this mean versus federal standards?
Currently, there is no federally enforceable maximum contaminant level (MCL) established for 1,2,3-trichloropropane in drinking water. The EPA’s detections in Kauai’s system occurred during an unregulated contaminant monitoring rule survey, which aims to gather data rather than assess compliance. Thus, measured levels—while detected above the reporting level of 0.03 µg/L—are not violations or indicators of unsafe water. This distinction clarifies that detection above a threshold does not equate to non-compliant or health-based exceedances.
If you are a homeowner reviewing the record's median and range, how should you interpret those values?
The median of the detected 1,2,3-TCP values in Kauai’s Lihue-Kapaa system was 0.055 µg/L. This means half the detections were above and half were below this value, within the range up to 0.086 µg/L. Since this is system-wide data, individual homes may have different concentrations. Hence, without specific water testing at your tap or well, you cannot assume your water matches these exact numbers. This provides a general context for understanding how typical detections appear in the public water supply record.
If your existing water equipment has failed, what should you document before seeking treatment options?
Before exploring new treatment options, write down the following details:
- Results of any recent water tests, especially for 1,2,3-trichloropropane or organochlorine compounds
- Description of your current equipment and what contaminants it addressed
- Water source type (surface or well), as this influences treatment needs
- Any observed water quality concerns such as taste, staining, or unusual appearances
Having this information ready helps in identifying the right treatment approach tailored to 1,2,3-TCP and other water concerns.
Considering the data and treatment challenges, what solution is designed for TCP in Kauai homes?
The C-Series 1,2,3-TCP filter ships ready to configure and uses technology specially developed for addressing 1,2,3-trichloropropane in residential water systems. Its design ensures sufficient granular activated carbon contact time and addresses TCP’s resistance to air stripping, delivering treatment targeted to this chlorinated solvent. Requesting a quote for the C-Series system may help restore effective treatment after equipment failure.
In summary, the EPA’s Lihue-Kapaa public water system record shows some detections of 1,2,3-TCP but no health-based violations. This record applies regionally to the public system supplying Kauai County and does not specify conditions in individual homes. For personal water quality assurance, individual testing is essential. More details are available through the EPA’s Drinking Water Contaminant Monitoring database.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-07-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Lihue-Kapaa (HI0000400), HI: 45 results across 1 listed contaminants, 5 detections above the reporting level; no federal MCL