The public water system serving Frankfort, Illinois, draws from groundwater and has no EPA health-based violations on record for 1,2,3-trichloropropane (TCP) or any of 18 monitored contaminants. Between February and August 2014, federal Unregulated Contaminant Monitoring Rule (UCMR3) tests found no detections of 1,2,3-TCP above the reporting level of 0.03 micrograms per liter (parts per billion) in the Frankfort system's water.

Why 1,2,3-Trichloropropane Resists Air Stripping and What That Means for Treatment Choice

1,2,3-TCP is a chlorinated solvent historically used as a soil fumigant impurity. It is volatile enough to be of concern but is notably resistant to air stripping, a common method used to remove many volatile organic compounds from water. This resistance means that treatment options relying on air stripping or similar aeration processes have limited effectiveness for reducing TCP concentrations in water supplies.

For households seeking to address potential TCP presence, technologies based on adsorption or advanced filtration provide a more suitable approach. Such methods can directly capture and retain 1,2,3-TCP molecules, addressing the limitation of air stripping for this compound.

How California's 5 ng/L State Limit Compares with the Absence of a Federal MCL

California has established a stringent public health goal of 5 nanograms per liter (0.005 micrograms per liter) for 1,2,3-TCP in drinking water, a level significantly lower than the federal detection threshold of 0.03 micrograms per liter used in UCMR3 monitoring. Currently, the U.S. Environmental Protection Agency has not set a Maximum Contaminant Level (MCL) for 1,2,3-TCP nationally, and the Frankfort system records zero health-based violations.

While California's limit reflects a precautionary approach to this contaminant, the lack of a federal MCL means that water systems like Frankfort's are monitored but not regulated for TCP at a federal level, emphasizing the importance of individual testing for households assessing their own water quality.

What the Reader Should Write Down Before Asking Anyone for Treatment Advice

• Source of water (municipal supply or private well)
• Date and laboratory results of any recent 1,2,3-TCP testing, noting the detection limits
• Details on water usage patterns and fixtures most in use
• Any known history of soil fumigant or industrial solvent use near the water source

Having this information helps water treatment professionals or retailers provide accurate guidance tailored to the household's precise conditions.

How Sample Depth, Well Depth or Source Type Changes What a Reader Should Expect

Groundwater source depth can influence the likelihood and concentration of TCP detection. Deep wells often draw from aquifers less affected by recent surface contamination; however, legacy contamination from past soil fumigant impurities may still occur decades later, as such compounds migrate slowly downward over time.

Surface water sources typically show different contaminant profiles than groundwater supplies. Since Frankfort's system is groundwater-based, the presence or absence of TCP in monitoring is related to subsurface contamination history rather than surface runoff.

Which Fixtures, Appliances or Processes Are Affected First and Why

Since TCP is soluble in water but volatile, the first household uses where it may be noticed include drinking water, cooking, and ice machines. Appliances that heat water, like kettles or coffee makers, can release volatile compounds during boiling, potentially impacting taste or odor perceptions.

Use of filtered water for these applications can provide added peace of mind where TCP presence is a concern, even when monitoring records show no detection at the system level.

How a Soil Fumigant Impurity from the 1950s-1980s Reached Deep Groundwater Decades Later

1,2,3-trichloropropane was not intentionally added but appeared as an impurity in soil fumigants historically used in agriculture, particularly from the 1950s to the 1980s. Over time, this impurity leached through the soil, gradually penetrating deep groundwater aquifers. Despite the decades-long lag, many regions nationwide have experienced detections due to this legacy contamination.

For Frankfort, the groundwater source's monitoring history has shown no such detections to date, but ongoing surveillance helps track any changes.

To clarify your home's water quality regarding TCP, the single most informative action is to obtain a laboratory test of your own tap water specifically analyzing for 1,2,3-trichloropropane at or below the federal UCMR3 reporting level of 0.03 micrograms per liter. Results at or below this threshold would confirm concentrations consistent with the public water system record. If higher readings appear, considering a Pentair 1,2,3-TCP Filter that ships ready to configure may be advisable to address household needs 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