Opening: What Government Sampling Tells Frankfort Residents About 1,2,3-TCP
The EPA’s Unregulated Contaminant Monitoring Rule (UCMR3) data for the Frankfort public water system, which serves over 24,000 residents in Will County, shows no detections of 1,2,3-trichloropropane (TCP) above the reporting level of 0.03 micrograms per liter (µg/L), or parts per billion (ppb) in 18 tested samples between February and August 2014. This indicates that the chlorinated solvent TCP was not measured at concentrations above the method’s sensitivity but does not reflect the specific concentration in any individual household’s water.
1. How a Soil Fumigant Impurity from the 1950s-1980s Reached Deep Groundwater Decades Later
1,2,3-trichloropropane historically occurred as an impurity in soil fumigants used from the mid-20th century to around the 1980s. These fumigants were intended for agricultural soil treatment but over time the TCP component migrated downward, penetrating groundwater layers. Due to its chemical stability and slow degradation, TCP remains detectable decades after application, making groundwater monitoring necessary even long after usage has ended.
2. Granular Activated Carbon Contact Time: Why Bed Depth Matters More for TCP Than for Taste
TCP is a chlorinated solvent that behaves differently from taste-affecting compounds in water. Removal depends heavily on granular activated carbon (GAC) contact time, which is influenced by the depth of the carbon bed in filtration equipment. Deeper beds increase contact time, improving TCP adsorption. This contrasts with taste concerns where adsorptive capacity and flow rates may have a different impact. For households with existing water treatment that struggles to keep up, upgrading to equipment featuring extended GAC bed depth can help enhance TCP reduction.
3. What the Reader Should Write Down Before Asking Anyone for Treatment Advice
- Water source type (groundwater for Frankfort)
- Age and material type of household plumbing (e.g., copper, PVC, or older alloys)
- Any prior water quality tests including TCP-specific analysis
- Description of existing water treatment equipment, especially filtration media and flow capacity
4. A Worked Example: Reading the Record's Median and Range as a Homeowner Would
For Frankfort’s system, all 18 samples showed non-detect results for TCP above 0.03 µg/L; thus, the median concentration is at or below this reporting limit. This means that while TCP was not measured above the method sensitivity, concentrations could still be present at lower levels undetectable by the test. Homeowners should recognize that system-wide data provide an overview, not a guarantee of individual tap water content.
5. Why the Reporting Level for This Solvent Is Thousands of Times Lower Than for Common Metals
1,2,3-trichloropropane is regulated through monitoring due to its potential health effects at very low concentrations. As a result, the analytical reporting level is set extremely low—0.03 µg/L—far below typical reporting levels for metals like lead or arsenic, which are often measured in micrograms per liter but at higher thresholds. This sensitivity reflects the need to detect trace amounts given the solvent’s toxicity profile.
6. The Role of Plumbing Material and Age, Separate From the Source Water
Although the public water system source is groundwater with no TCP detected above the reporting level, household plumbing can influence water quality. Older plumbing materials or certain pipe alloys might adsorb or release substances, but they do not generate TCP. Evaluating plumbing age and material helps distinguish source water concerns from in-home factors in water quality.
Closing: The Single Test to Order and What Result Would Settle the Question
The definitive action for any Frankfort household concerned about 1,2,3-TCP levels is to request a water analysis specifically testing for 1,2,3-trichloropropane at or below the 0.03 µg/L detection threshold. A result below this level would confirm TCP is not present at detectable concentrations in that household’s water. For those seeking enhanced protection beyond monitoring, the Autotrol 1,2,3-TCP Filter provides a direct-purchase option that ships ready to configure and operates with granular activated carbon technology designed to address this chlorinated solvent effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-08-12. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Frankfort (IL1970400), IL: 18 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level