Fleck 1,2,3-TCP Filter

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Is the presence of 1,2,3-trichloropropane (TCP) in municipal water a health alarm?

A common confusion is to equate any detection of 1,2,3-trichloropropane with unsafe drinking water. However, for Hempstead County's public water system serving the Hope Water Light Community, federal monitoring from 2013 to 2015 found no detections of TCP above the reporting threshold of 0.03 micrograms per liter (µg/L), or parts per billion (ppb). This monitoring does not establish a violation, nor does it indicate unsafe water quality. It simply shows that the chlorinated solvent was not measured above the minimal reporting limit during that period.

Why does 1,2,3-trichloropropane resist air stripping, and how does this affect treatment choices?

1,2,3-TCP is a chlorinated solvent with chemical properties that make it resistant to removal by air stripping, a treatment method that removes volatile compounds by transferring them to air. This resistance means that common aeration approaches, effective for other contaminants, do not reduce TCP levels significantly. Consequently, treatment choices for TCP often focus on specialized filtration technologies designed to adsorb or degrade this chlorinated solvent effectively.

How did a soil fumigant impurity from decades ago reach deep groundwater in Hempstead County?

TCP entered the environment historically as an impurity in soil fumigants used from the 1950s through the 1980s. Over time, this stable chlorinated compound migrated downward through soil and rock layers, eventually reaching deeper groundwater. This delayed transport explains why TCP may appear in groundwater long after its use has ceased, although in Hempstead County’s public surface water supply, monitoring found no detectable levels above the reporting limit.

What do 'detected', 'median', and 'range' mean in the water quality sampling record for TCP here?

In the EPA’s monitoring for the Hope Water Light Community system, “detected” means the instrument measured 1,2,3-TCP at or above 0.03 µg/L in a sample. The record shows zero detections among eight samples between 2015-03-11 and 2015-12-07. The “median” is the middle value in a set of results but here is effectively below the reporting level since no TCP was detected. The “range” spans the lowest to highest findings; for THC, this was from non-detect to non-detect. These terms provide context for interpreting the monitoring data without suggesting any exposure risk on their own.

Why is the reporting level for 1,2,3-trichloropropane much lower than for common metals?

The reporting level of 0.03 µg/L for TCP is thousands of times lower than typical thresholds for metals like lead or arsenic because chemical analysis methods for volatile organic compounds are more sensitive and aim to detect even trace amounts. This sensitivity helps identify minimal environmental presence but does not equate to a health standard or actionable exceedance. Metals have higher allowable levels due to different toxicological profiles and measurement techniques.

How should I compare Hempstead County’s 1,2,3-TCP record with adjacent areas without overinterpreting?

Since monitoring in Hempstead County showed no TCP detections, comparing this record with nearby counties requires careful attention to sampling scope and detection limits. Differences may reflect local geology, water sources, or historic land use. Avoid assuming that absence of detections means universal safety or that detections elsewhere indicate direct risk to your household. Each system’s data reflects regional conditions and monitoring parameters, not individual tap water quality.

How many samples and wells are behind these results, and what does a small sample size mean?

The 2013-2015 data for the public water system serving Hempstead County included eight samples collected from a mixture of source and distribution points within the system. While this provides a baseline for regional conditions, the limited number means occasional spikes or localized contamination may go undetected. Homeowners interested in their specific water quality should pursue private well or tap water testing tailored to their property to confirm the presence or absence of 1,2,3-TCP.

What testing should I order to resolve uncertainty about 1,2,3-trichloropropane at my home?

The definitive way to know if your household water contains 1,2,3-trichloropropane above trace levels is to collect a water sample from your tap and submit it to a certified laboratory with volatile organic compound analysis capability and TCP as a targeted analyte. This analysis establishes your water's unique condition, as even within Hempstead County, variations can occur. If TCP is present, treatment options such as the Fleck 1,2,3-TCP Filter, which ships ready to configure for residential use, can significantly reduce this chlorinated solvent’s levels.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-12-07. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Hope Water Light Comm. (AR0000230), AR: 8 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level