Deciding on 1,2,3-TCP Treatment for St. Charles, St. Louis Water Concerns

Water supplied to homes in St. Charles within St. Louis County, Missouri, is drawn from surface water sources and treated before delivery to taps. The water system serving this area, MO American Water Co. - St. Louis County, provides water to more than a million people across hundreds of thousands of service connections. Understanding water quality in this context helps residents decide on the appropriate class of treatment for their household, especially concerning potential contamination from solvents like 1,2,3-trichloropropane (1,2,3-TCP).

Why the Reporting Level for 1,2,3-TCP Is Set Far Below That of Common Metals

1,2,3-Trichloropropane, often referred to as TCP or the chlorinated solvent, is monitored at a reporting level of 0.03 micrograms per liter (µg/L), equivalent to 0.03 parts per billion (ppb) in this water system. This threshold is thousands of times lower than those established for common metals such as lead or arsenic. The reason for such a low reporting level is due to the chemical's potential long-term health concerns and its classification as an unregulated contaminant under federal monitoring rules. While this level is a detection benchmark rather than a safety limit, it guides careful observation of even trace amounts of this solvent in public water systems.

The Agricultural Land-Use History in St. Louis County and Its Connection to 1,2,3-TCP Occurrence

Land use around St. Charles and the broader St. Louis County includes regions historically engaged in agriculture and industrial activities. These practices have the potential to introduce chlorinated solvents like 1,2,3-TCP into the environment through soil and groundwater pathways, where contamination can migrate into surface water supplies. Federal monitoring from the 2013-2015 Unregulated Contaminant Monitoring Rule (UCMR3) found no detections of 1,2,3-TCP above the reporting level in the public water system serving this area, reflecting effective source water protection and treatment practices in place for surface water sourced supplies.

If You Manage a Large Household, Second Home, or Seasonal Property in the Area

Water demand and usage patterns vary significantly between standard households, large families, seasonal residences, and second homes. These variations affect how much treated water is used daily and influence decisions on the scale and capacity of any additional treatment devices. Larger households or seasonal properties may require treatment options capable of handling higher flow rates or intermittent operation without compromising performance related to 1,2,3-TCP or other specific contaminants.

How to Evaluate Treatment Capacity in Relation to Household or Facility Water Use

Choosing a treatment solution for 1,2,3-trichloropropane involves matching the technology to your daily water consumption. This ensures the treatment media or device lasts appropriately and maintains effective contact time to address solvent concerns. Key factors include the number of residents, peak water use periods, and total water volume processed each day. Selecting a treatment that ships ready to configure with a design suited for your household’s typical demand can optimize performance and maintenance intervals.

Distinguishing 1,2,3-TCP From Two Commonly Confused Water Issues

The chlorinated solvent 1,2,3-TCP should not be confused with other common water concerns such as dissolved solids or biological contaminants. Unlike minerals or bacteria, 1,2,3-trichloropropane is a man-made chemical primarily associated with industrial solvents and certain agricultural fumigants. Its presence and detection are based on specialized laboratory testing rather than routine home water quality checks. Understanding this distinction helps clarify why some treatment technologies target specific organics like 1,2,3-TCP rather than general water impurities.

What Not to Conclude From Area Monitoring Data

While the public water system records for MO American Water Co. - St. Louis County show no detections of 1,2,3-TCP above the reporting threshold, this does not guarantee the absence of the solvent in every individual household’s water. Detection status at the system level reflects broad water source conditions and treatment efficacy but cannot replace individual water testing. Homeowners concerned about 1,2,3-trichloropropane should conduct specific tests focused on their water supply to determine their personal need for treatment. These steps help ensure that any treatment solution, such as the Pentair 1,2,3-TCP Filter, which ships ready to configure and is designed to address chlorinated solvents, is appropriately matched to the household’s unique water quality challenges.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2013-11-06. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for MO American Water Co. - St. Louis County (MO6010716), MO: 20 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level