Autotrol 1,2,3-TCP Filter

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Agricultural History and Its Relation to 1,2,3-TCP Findings in Sussex

Residents may notice an unfamiliar chemical name when checking water quality reports: 1,2,3-trichloropropane, abbreviated as 1,2,3-TCP. This chlorinated solvent historically appeared as an impurity in soil fumigants used between the 1950s and 1980s. In Sussex County, Delaware, extensive farming activities once relied on such fumigants for crop production in the Rehoboth Beach area. The legacy of that use remains relevant because these chemicals, entering soil decades ago, can slowly migrate downward into groundwater, the source for the public water system serving over 81,000 people here.

Why the Reporting Level for 1,2,3-TCP Is Set Thousands of Times Lower Than for Common Metals

The federal government's detection threshold for 1,2,3-TCP is 0.03 micrograms per liter (µg/L), or 0.03 parts per billion (ppb). This reporting level is intentionally very low due to the compound's status as a chlorinated solvent with possible long-term health considerations under study. In contrast, metals like lead or copper are monitored at much higher thresholds because their drinking water standards stem from different toxicological profiles and regulatory histories. This means that even very small concentrations of 1,2,3-TCP are documented carefully, although detection does not indicate a violation or unsafe water by itself.

Sample Size and the Scope of Water Testing Behind Sussex's 1,2,3-TCP Data

Between 2013 and 2015, the Rehoboth District’s groundwater-sourced public water system underwent federal monitoring under the UCMR3 program. Twelve samples taken during that period showed no detections of 1,2,3-TCP above the reporting level. While twelve samples represent a limited dataset relative to thousands of connections, they are part of the official record for this public water system. Notably, no sample indicated the presence of this chlorinated solvent above the sensitive detection threshold, and no health-based violations are recorded for 1,2,3-trichloropropane in this system.

How Autotrol's Equipment Addresses 1,2,3-TCP Challenges in Household Water

For homeowners seeking to address 1,2,3-TCP concerns independently, specialized water treatment equipment is available that ships ready to configure. One option uses proprietary filtration technology designed to reduce the concentration of chlorinated solvents including 1,2,3-TCP by capturing or chemically neutralizing them before water reaches taps. This approach provides a secondary layer of control, supplementing the public water system’s treatment and monitoring efforts.

Consequences of Leaving 1,2,3-TCP Untreated Over Time

When 1,2,3-trichloropropane is present beyond trace amounts in water, long-term exposure has been the subject of research due to the chemical's persistence and potential impacts. However, given the absence of detections above reporting levels in Rehoboth Beach’s public water, the concern for households served by this system remains largely theoretical. Untreated chlorinated solvents could contribute to concerns about taste, staining, or corrosion in plumbing but the current monitoring record does not reflect these issues at levels requiring regulatory action.

Clarifying 'Detected', 'Median', and 'Range' in the Rehoboth Water Sampling Data

In the context of the sampling data, 'detected' means the substance was measured above a defined reporting level, here 0.03 µg/L. 'Median' and 'range' provide statistical summaries of all detected values but are not applicable when no detections occur as with 1,2,3-TCP in Rehoboth Beach samples. Therefore, the record here documents zero detections, indicating that in the twelve samples tested, measurements remained below the stringent reporting limit for this chlorinated solvent.

This information reflects the official federal monitoring conducted on the Rehoboth District public water system serving Sussex County homes. Detailed data are available through the EPA's Safe Drinking Water Information System (SDWIS) and the Unregulated Contaminant Monitoring Rule (UCMR3) archives.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-10-26. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Rehoboth District (DE0000991), DE: 12 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level