Understanding 1,2,3-TCP in La Crosse: Water Records and What They Actually Show
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Whole House 1,2,3-TCP Reduction Water Filter System - Trichloropropane Removal
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1. The agricultural land-use history of La Crosse and its relation to 1,2,3-TCP detections
La Crosse, Wisconsin’s groundwater source for municipal water comes from an area with a history of agricultural activities that have included fumigants used in the mid-20th century. 1,2,3-trichloropropane (TCP) is a chlorinated solvent once found as an impurity in soil fumigants applied decades ago. This legacy use means TCP can occasionally be detected in groundwater samples, as it is persistent and can migrate slowly through soil into aquifers. The pattern of detections reflects this historical land use rather than recent contamination events.
2. Why the reporting level for 1,2,3-TCP is set far lower than for common metals
Government monitoring detects 1,2,3-TCP at levels as low as 0.03 micrograms per liter (µg/L), equivalent to 0.03 parts per billion (ppb). Such a low reporting threshold is necessary because TCP is a synthetic chemical without natural sources, and its presence, even at trace levels, signals legacy pollution. In contrast, metals frequently found in water can have higher reporting levels because they occur naturally and at varying background concentrations. The low detection threshold for TCP does not equate to a violation or health risk by itself; it is a tool for tracking this particular chemical’s presence over time.
3. Why 1,2,3-trichloropropane resists air stripping and the treatment implications
TCP is a chlorinated solvent with properties that make it resistant to air stripping—a common water treatment method that removes volatile compounds by transferring them to air. Because TCP does not readily volatilize, air stripping offers limited effectiveness for addressing it in water. This chemical’s resistance to this treatment path means households looking to address TCP in their water need alternative solutions that specifically target such persistent chlorinated solvents.
4. Comparing La Crosse’s 1,2,3-TCP data with neighboring counties without overreading
The La Crosse Waterworks system, which serves about 53,000 people, has reported no detections of 1,2,3-TCP above the reporting level in 26 samples collected from 2014 to 2015. Neighboring counties might have different sampling histories and land-use patterns affecting detection results. However, differences in data do not automatically indicate better or worse water quality, as sampling frequency, groundwater flow, and historical use all influence measurements. It’s important to consider local testing reports individually rather than assuming a one-to-one comparison.
5. Understanding what 'detected,' 'median,' and 'range' mean in this water quality record
In the government’s data for La Crosse’s water system, the term 'detected' means a laboratory instrument measured 1,2,3-TCP at or above 0.03 micrograms per liter during that sample. Here, no samples showed TCP above this level. The 'median' is the middle value of all measurements if ordered by concentration, which in this case would be below the detection limit. The 'range' describes the span from the lowest to highest detected concentrations. Since no detections occurred, the range effectively indicates non-detects for TCP. These terms help summarize the sampling but do not imply the exact concentration in any particular household’s water.
6. Why aesthetic secondary standards differ from health-based limits for contaminants like TCP
Aesthetic secondary standards relate to taste, odor, and appearance factors in water, which differ fundamentally from health-based limits. For 1,2,3-trichloropropane, there is no federal maximum contaminant level (MCL) because regulatory agencies have not established formal limits yet. The absence of a health-based violation for La Crosse’s water system means current data do not indicate TCP presents a known health risk at detectable levels. Homeowners concerned about taste or staining should know those issues are governed by different water parameters, not TCP.
What you should not conclude from La Crosse area data
While the official monitoring found no detectable 1,2,3-TCP in La Crosse’s municipal supply during the survey period, this does not guarantee the absence of TCP from any individual home’s water. Private well water can differ notably, and only testing that specific water source can determine TCP presence and concentration. If a household chooses to address potential residual TCP, the Autotrol 1,2,3-TCP Filter is documented to effectively target this compound. This equipment ships ready to configure for household water systems and addresses TCP’s unique chemical properties. Area-wide data offer context but not a definitive assessment of any one household’s water quality.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-06-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for La Crosse Waterworks (WI6320309), WI: 26 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level