Reading a Laboratory Test Report for 1,2,3-Trichloropropane
If you have tested your household water for 1,2,3-trichloropropane (also called 1,2,3-TCP or TCP), your lab report lists concentrations in micrograms per liter (µg/L) or parts per billion (ppb). Since this chlorinated solvent is monitored very carefully due to its chemical nature, the detection limits are very low. Reports show whether 1,2,3-TCP was detected above the minimum reporting level; a detection means the instrument measured this compound, not that the water is unsafe or violates any limit. Knowing your home's exact concentration requires a certified laboratory test specific to your water source.
Agricultural Land Use History in Mobile County and Its Relation to 1,2,3-TCP Detections
The area around Citronelle, Mobile County, has a history of agricultural land use, including crop production and land fumigation practices that used soil fumigants containing trace amounts of 1,2,3-TCP as an impurity. These historical practices have been associated with detections of 1,2,3-trichloropropane in groundwater over time. However, government monitoring for the South Alabama Utilities Water System, which serves Citronelle with groundwater sources, did not detect 1,2,3-TCP above the reporting level in samples collected from 2013 through 2015.
How 1950s-1980s Soil Fumigant Impurities Reached Groundwater Decades Later
1,2,3-TCP was not intentionally added but existed as a byproduct in fumigants used before regulatory controls tightened. These compounds leached slowly through soil layers, reaching groundwater long after application ceased. This delayed migration explains why 1,2,3-TCP may appear in deep groundwater many years after historical agricultural use. The slow movement and persistence require careful monitoring and management of water sources in affected regions, including Mobile County.
Why Reporting Levels for 1,2,3-TCP Are Much Lower Than for Metals
Reporting levels for 1,2,3-TCP are set very low by federal monitoring to detect even trace traces of this chemical, usually at 0.03 micrograms per liter (ppb). This sensitivity is necessary because 1,2,3-TCP is a synthetic chlorinated solvent with different health considerations than metals. In contrast, common metals typically have higher reporting thresholds due to their different chemical behavior and health impact profiles.
What a Certified Laboratory Test for 1,2,3-TCP Reports and How to Read It
A certified lab report for 1,2,3-trichloropropane will state concentration values or indicate ‘non-detected’ when below the reporting level. It also includes detection limits, sample collection dates, and analytical methods used. Understanding these details helps clarify whether the constituent is present at a measurable level or below the threshold of detection specific to the test method.
Interpreting 'Detected', 'Median', and 'Range' in Local Sampling Data
In the South Alabama Utilities Water System records, 'detected' means the chemical was measured above the method’s minimum reporting level, not that it is harmful or an exceedance. 'Median' is the middle value among samples and ‘range’ indicates the variation from lowest to highest measured. Citronelle’s water system reports 32 samples with zero detections of 1,2,3-TCP above 0.03 µg/L during the 2013-2015 monitoring.
Why 1,2,3-Trichloropropane Resists Air Stripping and Its Impact on Equipment Choice
1,2,3-TCP is a chlorinated solvent that does not easily volatilize, meaning it resists removal by air stripping methods. This chemical property affects how household water treatment equipment must be chosen. Technologies relying on aeration alone will not effectively reduce 1,2,3-TCP levels. Instead, specialized equipment designed to adsorb or chemically capture chlorinated solvents is needed to address this water constituent.
For homeowners in Citronelle evaluating options, the Pentair 1,2,3-TCP Filter ships ready to configure as a direct-purchase solution. It uses a proven approach to address 1,2,3-trichloropropane's chemical properties based on demand measurements from your own water test, supporting a tailored treatment choice.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-03-17. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for South Alabama Utilities Water System (AL0000967), AL: 32 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level