Choosing Equipment for 1,2,3-TCP in Kalamazoo: Understanding Water Quality and Treatment Options

What does a laboratory test report for 1,2,3-TCP usually show?

Laboratory test reports for 1,2,3-trichloropropane (often abbreviated as 1,2,3-TCP or just TCP) typically list the concentration of this chlorinated solvent in water samples. The values are given in micrograms per liter (µg/L), equivalent to parts per billion (ppb). A test report shows whether the compound was detected above the laboratory's reporting level. For Portage, part of Kalamazoo County, EPA sampling from 2013 to 2015 found no detections of 1,2,3-TCP above the reporting level of 0.03 µg/L in public water system samples. This means the federal survey instruments did not measure TCP at or above that sensitivity in the system's groundwater supply.

Why does granular activated carbon contact time matter more for 1,2,3-TCP than for taste concerns?

Granular activated carbon (GAC) is a common technology to address 1,2,3-trichloropropane in water. The effectiveness of GAC depends heavily on contact time—the length of time water remains in contact with the carbon bed. For TCP, a persistent chlorinated solvent, longer contact times achieved by greater bed depth or slower flow rates are important because TCP molecules are chemically resistant and do not adsorb quickly. This contrasts with many taste and odor compounds, which often adsorb more rapidly and therefore require less contact time. When choosing treatment equipment, focusing on adequate GAC bed depth and flow control tailored to TCP is essential for optimum performance.

Why does 1,2,3-trichloropropane resist air stripping and what does this mean for treatment choice?

1,2,3-TCP resists removal by air stripping due to its low volatility and chemical properties. Air stripping removes volatile organic compounds by transferring them from water to air, but TCP's relatively low vapor pressure and chemical stability limit this process. As a result, equipment relying on air stripping is not effective for TCP. This resistance points toward adsorption technologies like granular activated carbon for treatment, which physically binds TCP molecules in the carbon pores rather than relying on volatilization.

How do public system records differ from private well testing in what they establish about 1,2,3-TCP?

Public system records, such as EPA's Safe Drinking Water Information System data for Portage, represent aggregated sampling of the water system sourced from groundwater. These records provide a general profile of the system's quality but do not reflect conditions at individual taps or wells. A private well owner must conduct specific testing of their own water to determine 1,2,3-TCP presence or concentration locally. Whereas public records report detections or nondetections over multiple samples and connections, private well testing gives direct information relevant to a household's water supply.

What do the terms 'detected', 'median', and 'range' mean in the sampling record on this page?

In EPA sampling records, a constituent is marked 'detected' if measured at or above the laboratory's reporting limit. 'Median' is the middle value of concentrations measured across samples, and 'range' indicates the span between the lowest and highest measurements. For 1,2,3-TCP in the Portage system, all 22 samples showed no detections above the 0.03 µg/L reporting level, so median and range for detected values are not applicable. These terms help interpret water quality trends but do not imply any regulatory violation or safety issue on their own.

How did a soil fumigant impurity from the 1950s-1980s reach deep groundwater decades later?

1,2,3-trichloropropane originated as an impurity in soil fumigants commonly used from the 1950s through the 1980s. Over time, this compound migrated downward through soil and fractured rock, eventually reaching deep groundwater sources used in public water systems like Portage's. The slow movement means TCP contamination can emerge decades after historic agricultural practices ceased. Understanding this timeline explains why water managers monitor for TCP despite no recent local use of fumigants containing it.

Choosing the right treatment equipment involves understanding these water quality conditions and chemical behaviors. Since Portage's water system records show no TCP detections above reporting limits, private well owners should test their own water to know their situation. For households seeking technology to address 1,2,3-trichloropropane, the Fleck 1,2,3-TCP Filter, a granular activated carbon-based device, ships ready to configure and can provide targeted contact time for effective TCP adsorption.

This page reviewed government water quality results and chemical properties of 1,2,3-trichloropropane relevant to treatment choice in Kalamazoo County. Testing your water specifically and selecting equipment with sufficient carbon contact time are key steps toward managing the presence of this chlorinated solvent.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2013-10-10. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Portage (MI0005520), MI: 22 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level