Household Guide to 1,2,3-TCP Occurrence in Bexar County Water Supplies

Government records from the EPA for the San Antonio Water System serving Bexar County, TX, indicate that in federal monitoring conducted from 2013 to 2015, 1,2,3-trichloropropane was not detected at or above the reporting threshold of 0.03 micrograms per liter (parts per billion) in the public water supply. This public water system serves over 2.6 million people via more than 880,000 connections and sources its water from surface supplies.

Why the Reporting Level for 1,2,3-Trichloropropane is Exceptionally Low

The chlorinated solvent known as 1,2,3-TCP is measured at levels thousands of times lower than common metals due to its chemical properties and regulatory focus. Unlike metals that accumulate and have higher thresholds, 1,2,3-trichloropropane is a synthetic industrial compound associated with agricultural fumigants and industrial solvents, which may have carcinogenic potential at trace levels. The EPA’s monitoring program sets the reporting level at 0.03 micrograms per liter to track even minute presence of such contaminants, aiding early detection and research rather than signifying a violation or immediate risk.

Agricultural Land Use and Its Relationship to 1,2,3-TCP Detections in the Region

Bexar County’s historical agricultural activities involved fumigant application in the past decades, which has been linked regionally to low-level detections of chlorinated solvents like 1,2,3-TCP in groundwater in some parts of Texas. However, San Antonio’s water system relies primarily on surface water sources, which reduces the direct impact from agricultural soil contamination. The absence of detection in the monitoring data reflects this supply context and current land-use patterns, which differ from areas relying heavily on local groundwater extraction influenced by farming.

Additional Considerations for Commercial and Industrial Water Consumers

While households generally focus on adherence to public water standards and aesthetic water qualities, commercial and industrial users often require more detailed assessments of chlorinated solvents like 1,2,3-TCP due to process sensitivity or regulatory compliance for wastewater discharge. Such entities will typically conduct site-specific testing and maintain records on solvent usage or disposal that inform their operational water quality requirements beyond municipal reporting.

Maintenance Rhythm of the Autotrol System for Chlorinated Solvent Treatment

The documented technology available for addressing trace levels of 1,2,3-trichloropropane is the Autotrol 1,2,3-TCP Filter, which ships ready to configure for residential use. Maintenance of this system involves periodic attention to filter media replacement and system flushing based on water consumption and initial demand measurement, typically recommended on an annual to biennial schedule to ensure optimal performance.

Consequences of Long-Term Exposure to Untreated 1,2,3-TCP

Long-term exposure to chlorinated solvents like 1,2,3-trichloropropane at elevated concentrations has been studied due to its potential health effects. However, the data from San Antonio Water System show no detection at levels requiring concern. Untreated exposure in hypothetical scenarios would depend on actual concentration, which individual household testing can confirm. Chronic consumption of water with high levels of chlorinated solvents has been linked in studies to health issues, making precautionary treatment an option for those seeking additional protection.

Interpreting the Monitoring Data as a Homeowner

The EPA record lists 70 samples collected with no detections of 1,2,3-TCP above the reporting level of 0.03 micrograms per liter from March to December 2015. For a homeowner, this means that in the period sampled, the chlorinated solvent was either not present or was below the measurement threshold set for this contaminant. Testing personal water supply is necessary to confirm levels in a private well or localized source, as public system values represent averages and do not guarantee individual tap water content.

For households concerned about 1,2,3-trichloropropane, the Autotrol 1,2,3-TCP Filter provides a documented approach to manage chlorinated solvent presence. This system supports direct purchase, ships ready to configure, and can be matched to user demand measured through water testing results.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-12-04. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for San Antonio Water System (TX0150018), TX: 70 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level