How Did a Soil Fumigant Impurity From the 1950s-1980s Reach Deep Groundwater Decades Later?
1,2,3-Trichloropropane, often called 1,2,3-TCP or simply TCP, is a chlorinated solvent historically linked to impurities in soil fumigants used primarily between the 1950s and 1980s. Because TCP is chemically stable and persistent, it moves slowly through soil layers and can take decades to reach groundwater sources. In regions like El Paso County supplied by surface water, TCP contamination in groundwater is less direct but remains a consideration in treatment planning. Understanding this history helps clarify why ongoing monitoring measures the presence of TCP even long after its primary use has diminished.
Why Do Aesthetic Secondary Standards Differ From Health-Based Limits for 1,2,3-TCP?
Government water quality data make distinctions between health-based limits and aesthetic secondary standards. For TCP, no federal maximum contaminant level (MCL) currently exists, meaning that detections do not equate to violations or unsafe water by regulatory definitions. Aesthetic secondary standards address issues such as taste, odor, or staining rather than health risks. Data from El Paso County’s public water system show no health-based violations related to TCP. This indicates the water meets federally recognized health criteria, though aesthetic considerations may still influence homeowner treatment decisions.
Why Does 1,2,3-Trichloropropane Resist Air Stripping and What Does That Mean for Treatment Choice?
1,2,3-TCP is chemically resistant to air stripping methods, a treatment that removes contaminants by transferring them from water to air. Because TCP does not readily volatilize, air stripping is generally ineffective in reducing its concentration. This property directs homeowners toward treatment technologies designed specifically for TCP, which physically or chemically adsorb or degrade the compound rather than relying on air exchange processes. Choosing the correct treatment class requires understanding these chemical behaviors to ensure effective management.
How Does the Treated Water Differ at the Tap Once the Documented Technology Is in Place?
Using a specialized C-Series 1,2,3-TCP Filter that ships ready to configure, residential water treatment addresses TCP by targeting this chlorinated solvent directly. When configured properly, treated water at the tap shows lower levels of TCP relative to untreated water, improving confidence in water quality for families making treatment decisions. This filtration approach does not alter the overall safety profile established by the public water system’s compliance record but adds a layer of protection against this specific contaminant.
A Worked Example: Reading the Record’s Median and Range as a Homeowner Would
The Colorado Springs Utilities public water system record serving El Paso County reported 18 samples for 1,2,3-TCP between July 2013 and May 2014 with zero detections above the reporting level of 0.03 micrograms per liter (µg/L), or 0.03 parts per billion (ppb). This absence of detectable TCP means the median and maximum values recorded were below that threshold. For a homeowner, this data indicates typical tap water TCP levels at or below monitoring sensitivity—though only a specific test of your home’s water can confirm its condition precisely.
How Do Public-System Records Differ From Private-Well Testing in What They Establish?
Public water system monitoring provides aggregated data representing water quality supplied to multiple homes across an area, such as El Paso County. It reflects surface water source conditions and treatment effectiveness at a system-wide scale. In contrast, a private well’s water quality depends on localized conditions and requires individual testing to determine constituent levels like 1,2,3-TCP. Public records cannot substitute for that personal assessment but offer an important context for considering potential treatment needs.
What Single Test Should I Order to Settle Whether I Need This Treatment?
To determine the appropriate treatment class for your home related to 1,2,3-trichloropropane, the key step is to order a certified water test that specifically measures TCP concentration using analytical methods sensitive to levels at or below 0.03 µg/L (ppb). This test will confirm if 1,2,3-TCP is present and at what level, providing clear guidance for whether implementing a C-Series 1,2,3-TCP Filter is a fitting measure. Without such testing, treatment choices rely on approximations rather than your water’s actual chemistry.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-05-12. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Colorado Springs Utilities (CO0121150), CO: 18 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level