What does a laboratory test report for 1,2,3-TCP typically include?

A laboratory report analyzing water for 1,2,3-trichloropropane, also called 1,2,3-TCP or chlorinated solvent, will list concentrations in micrograms per liter (µg/L) or parts per billion (ppb). These figures show whether the compound was detected above the lab’s minimum reporting level. Detection alone does not indicate a violation or unsafe condition. For example, the City of Keizer public water system in Marion County showed no detections above 0.03 µg/L during EPA monitoring surveys from 2013 to 2015.

How does Marion County’s agricultural history relate to 1,2,3-TCP levels?

Marion County has a legacy of agricultural land use dating back many decades. 1,2,3-trichloropropane was historically present as an impurity in soil fumigants used primarily during the 1950s through the 1980s. This past use maps onto groundwater detections because the chlorinated solvent can leach slowly over time. However, EPA data from the public water system shows no detections above reporting levels in the recent monitoring period.

Why is granular activated carbon bed depth important for 1,2,3-TCP treatment?

The contact time within a granular activated carbon (GAC) filter depends heavily on bed depth. For 1,2,3-TCP, longer contact times maximize adsorption and thus the capability to capture the chlorinated solvent. This factor differs from treatment for aesthetic issues where taste or odor concerns might require shorter contact times. Households weighing treatment options should consider GAC bed depth as a critical dimension related to how effectively TCP can be addressed.

What details should residents note before seeking treatment advice?

Before comparing treatment approaches, residents should have key information documented, including:

• Results of a recent laboratory test specific to their own water showing 1,2,3-trichloropropane concentration
• Water usage patterns and daily consumption volumes
• Current water source details (well depth, source type)

This information helps in assessing the scale and capacity needed for any filtration equipment chosen.

How does 1,2,3-TCP enter groundwater and distribution systems in Marion County?

The chlorinated solvent primarily originated as a soil fumigant impurity decades ago. Over time, it migrated downward through soil and rock layers to reach groundwater supplies. Because the City of Keizer's system relies on groundwater, this pathway is relevant. However, recent EPA surveys found no detections above the minimum reporting level, reflecting effective dilution, degradation, or low source concentrations.

How to evaluate treatment capacity against household water demand?

When considering treatment for 1,2,3-trichloropropane, it's essential to match the system’s capacity to daily water use. Filters designed for certain flow rates or volumes may underperform if demand exceeds their capability. Detailed knowledge of household water consumption ensures any configured filter system can maintain consistent treatment without bypass or breakthrough.

How did 1,2,3-TCP from soil fumigants in the 1950s-1980s reach deep groundwater decades later?

The slow migration of 1,2,3-trichloropropane results from its chemical properties and historical application practices. After soil fumigants containing this impurity were applied, it took many years for the solvent to percolate down through soil horizons and rock formations to reach the deep groundwater feeding public supply wells. This delayed arrival explains why careful monitoring continues today.

What should you NOT conclude from Marion County area monitoring data?

Area-level monitoring data from the City of Keizer’s groundwater supply shows no detections of 1,2,3-TCP above reporting levels and no health-based EPA violations. However, these results do not establish the concentration in any individual household's water. A lack of detection in public water system records also does not rule out the presence at very low or undetected levels in private wells. Homeowners should obtain specific laboratory testing of their water if concerned. Choosing treatment, such as a filter configured with the C-Series 1,2,3-TCP Filter technology, should be based on actual water analysis and household water usage rather than solely on area data.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2014-09-24. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for City of Keizer (OR4100744), OR: 30 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level