Autotrol 1,2,3-TCP Filter

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If the reporting level for 1,2,3-trichloropropane is far lower than for many common metals, what does that mean?

The federal Environmental Protection Agency (EPA) uses a very low reporting threshold—0.03 micrograms per liter (µg/L), or parts per billion (ppb)—for detecting 1,2,3-trichloropropane (TCP), a chlorinated solvent, in public water systems. This level is thousands of times lower than reporting levels set for metals like lead or arsenic. The reason is that TCP is a synthetic chemical historically used as a solvent and contaminant in soil fumigants, and its presence even at trace levels is monitored carefully to understand potential exposure. However, detection above this very low level is not a violation or a measure of safety, but rather an early indicator for water managers and consumers to consider.

If you consider the agricultural land-use history of Washington County, MN, what patterns emerge in 1,2,3-TCP findings?

The Woodbury public water system, serving over 82,000 people in Washington County from groundwater sources, underwent federal monitoring from 2013 to 2015 under the EPA's Unregulated Contaminant Monitoring Rule (UCMR3). During this period, all twelve samples tested reported no detectable 1,2,3-trichloropropane above the 0.03 µg/L reporting level. Washington County's agricultural history includes periods when soil fumigants containing low-level TCP impurities were applied, but current monitoring suggests that this legacy has not resulted in measurable TCP concentrations in this system’s water. This regional sampling does not guarantee the absence of TCP in any individual household’s well but indicates that the public groundwater supply remains below the very sensitive detection limits for this compound.

If you observe issues with certain water fixtures or processes, which might be affected first by TCP?

While 1,2,3-trichloropropane does not typically cause immediate taste or odor changes and is colorless, it may impact water fixtures and appliances subtly over time by contributing to chemical loads in the water. Because TCP is a volatile chlorinated solvent, its presence is more relevant for health considerations than direct aesthetic effects. Therefore, typical household fixtures like faucets, dishwashers, and water heaters generally show no direct signs related to TCP. Testing is the only way to confirm presence within a home’s water supply since the compound is not visually or organoleptically detectable.

If you want to compare this area's TCP record with neighboring counties without overreading the data, what should you keep in mind?

Comparisons between counties should respect that monitoring results come from distinct public water systems, each with unique sources and histories. Even if neighboring counties report occasional detections of 1,2,3-trichloropropane, Washington County’s Woodbury system showed none above the federal reporting level during the sampling period. This does not imply the other counties’ water is unsafe or worse, only that regional differences in past land use, geology, and water sourcing contribute to variations in detected TCP levels. Households relying on private wells should note that their water may differ significantly from public system results and that testing is essential for an accurate picture.

If you have heard bed depth is crucial for treating TCP, why does granular activated carbon contact time matter more here?

Granular activated carbon (GAC) is widely recognized for trapping chlorinated solvents such as 1,2,3-trichloropropane due to its adsorptive properties. For effective control of TCP, contact time—the duration water spends in contact with the carbon bed—is more critical than just the total bed depth. Longer contact time allows more opportunity for TCP molecules to bind to the carbon, improving treatment effectiveness. Shallow or fast-flowing carbon beds may not adequately address 1,2,3-TCP, even if the carbon quantity is large. Therefore, attention to system design that optimizes contact time is vital when considering treatment technologies for this compound.

If you seek treatment advice, what key water information should you record first?

Before exploring options to address 1,2,3-trichloropropane in your household water, write down the following details:

• The source of your household water (public supply or private well)
• The results of any recent water quality tests related to chlorinated solvents or specifically TCP
• Any known history of land use near your water source, such as former agricultural or industrial activity
• Current water usage volumes to estimate daily demand

Having this information will clarify your situation and guide discussions about appropriate water treatment approaches.

In closing: Which test should you order to reliably determine your household's TCP status?

Since regional monitoring shows no detections above the 0.03 µg/L reporting level, the only way to know your water’s specific 1,2,3-trichloropropane content is through a specialized laboratory test for chlorinated solvents. A water test report that shows TCP levels below the 0.03 micrograms per liter threshold, or not detected at all, will settle the question for your home. If you find measurable amounts, treatment with the Autotrol 1,2,3-TCP Filter—an equipment technology that ships ready to configure—can help reduce this chlorinated solvent effectively, supporting your household’s water quality goals.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-06-02. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Woodbury (MN1820025), MN: 12 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level