Autotrol 1,2,3-TCP Filter

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Groundwater Supply and the Brunswick/Topsham Water System

The public water system serving Brunswick and Topsham in Cumberland County, Maine, draws from groundwater sources to supply nearly 19,000 residents through over 7,500 connections. This natural aquifer system provides water that undergoes municipal treatment and distribution before reaching household taps. According to EPA records, the Brunswick/Topsham Water District has no health-based violations on record, indicating compliance with federal drinking water standards.

Granular Activated Carbon Contact Time: Why Bed Depth Matters More for 1,2,3-TCP Than Taste

For treating chlorinated solvents like 1,2,3-trichloropropane (TCP), the effectiveness of filtration depends heavily on the contact time between water and the granular activated carbon (GAC) bed. Contact time is influenced by the depth of the carbon bed and the flow rate: deeper beds allow more prolonged interaction, enhancing the absorption of trace organic compounds such as TCP. While taste-related issues often depend on different parameters, addressing TCP effectively requires sufficient carbon volume and residence time to adsorb this stubborn chlorinated solvent.

Legacy of Soil Fumigant Impurities from Mid-20th Century Agricultural Use

1,2,3-TCP was commonly present as an impurity in soil fumigants used extensively between the 1950s and 1980s. Over time, these chemicals leached into the soil and gradually migrated down to deep groundwater sources beneath the Brunswick and Topsham area. Despite decades passing, this chlorinated solvent remains detectable in trace amounts due to its persistence and mobility in aquifers. Understanding this history helps clarify why TCP can still be present even in regions without recent contaminant sources.

Consequences of Untreated 1,2,3-TCP Presence in Household Water

Leaving TCP unaddressed in household water over many years does not cause immediate health-based violations, but its presence is a concern due to the compound's classification as a potential carcinogen under some health advisories. Chronic consumption of water containing low levels of chlorinated solvents like TCP may raise health questions, especially where appliances or equipment are challenged by persistent trace organic compounds. Thus, maintaining effective filtration equipment capable of handling TCP is important for long-term water quality management.

Seasonal and Multi-Year Variation in 1,2,3-TCP Concentrations

EPA unregulated contaminant monitoring conducted from 2013 to 2015 shows six sampling events for 1,2,3-TCP in the Brunswick/Topsham Water District, with no detections above the reporting level of 0.03 micrograms per liter (µg/L), or parts per billion. These results reflect periods from February to August 2015. Such data indicate that 1,2,3-TCP levels fluctuate below detectable limits during these monitored intervals, underscoring the need for specialized testing to identify presence at trace concentrations.

Pathways of 1,2,3-TCP Entry into Regional Groundwater and Distribution

The chlorinated solvent 1,2,3-TCP originates primarily from historical agricultural fumigant use and industrial activities. In Cumberland County, contamination follows movement through soil layers into groundwater aquifers, then is drawn by municipal wells into the public water system. As a volatile, water-soluble compound, TCP can persist in subsurface environments and enter distribution systems at low concentrations, necessitating ongoing attention to treatment efficacy.

Testing Your Household Water to Address 1,2,3-TCP

Given that government monitoring does not specify concentrations in individual homes, the only way to understand your water’s 1,2,3-TCP levels is through a certified independent test analyzing for this chlorinated solvent at trace microgram-per-liter levels. Such testing provides a definitive measure of whether TCP is present beyond the reporting threshold. If your testing indicates the presence of TCP or challenges with current equipment keeping pace, solutions using advanced filtration media designed specifically for this purpose are available. The Autotrol 1,2,3-TCP Filter, an Autotrol System product, ships ready to configure and is proven for treating TCP in residential water supplies.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-08-04. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Brunswick/Topsham Water District (ME0090260), ME: 6 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level