1,2,3-TCP in Washington County Water: Understanding Local Data and Treatment Depth

When considering the presence of 1,2,3-trichloropropane (TCP) in your home's water, it's important to begin with what area-wide testing results mean—and do not mean—for your specific water. Washington County's public water system data offers a baseline for understanding potential exposure but cannot specify the exact level inside any individual household or well.

Granular Activated Carbon Contact Time: Why Bed Depth Matters More for TCP Than for Taste

Longer carbon bed depths increase effectiveness against 1,2,3-TCP

1,2,3-TCP molecules are more challenging to adsorb than many taste-affecting compounds. Longer contact time with granular activated carbon (GAC) beds, achieved by deeper bed depths, improves the chance for TCP molecules to be captured effectively.

Surface area and flow rate affect TCP adsorption efficiency

Higher surface area GAC and controlled flow rates through the carbon bed optimize the interaction between water and carbon, helping reduce chlorinated solvent content.

Why the Reporting Level for This Solvent Is Thousands of Times Lower Than for Common Metals

1,2,3-TCP reporting level set at 0.03 micrograms per liter (ppb)

This low detection threshold reflects TCP's potency and environmental persistence, requiring sensitive instrumentation to identify its presence even in trace amounts.

Contrast with metals like lead, which have higher detection and action levels

Common metals in water are often regulated and detected at parts per million or higher; the low reporting level for TCP is due to its chemical characteristics and regulatory focus on early detection rather than compliance enforcement.

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

High chemical stability limits removal by aeration

1,2,3-TCP does not readily volatilize into air, making air stripping ineffective. This requires treatment methods that physically capture or chemically degrade TCP in water.

Adsorption on granular activated carbon is preferred

C-Series technology uses GAC optimized for TCP contact time and surface interaction to address this resistant chlorinated solvent in residential water supplies.

The Household or Facility Symptoms That Do and Do Not Point to This Problem

No taste or odor reliably indicates 1,2,3-TCP presence

Unlike some contaminants, 1,2,3-trichloropropane generally does not impart taste or smell to water, so these sensory checks cannot determine its presence.

Staining or discoloration are unrelated to TCP

These issues typically stem from metals or other compounds, not chlorinated solvents like TCP.

Testing is required to establish your home's water quality for 1,2,3-trichloropropane

Because area-wide data do not specify individual well or tap levels, a laboratory test of your household water is necessary for accurate assessment.

What Questions a Commercial or Industrial Operator Adds That a Household Does Not

Volume and flow rate demands impact treatment size and frequency

Operators managing large water quantities must consider equipment capacity and carbon bed exhaustion rates more carefully than residential users.

Regulatory reporting and compliance obligations apply differently

Commercial and industrial sites may face additional monitoring and reporting standards beyond household scope for 1,2,3-TCP.

The Oakdale public water system in Washington County serves over 30,000 people using groundwater sources. Government records from 2013 to 2015 include 12 samples of 1,2,3-trichloropropane with no detections above the reporting level of 0.03 micrograms per liter (0.03 parts per billion). These results are from a federal occurrence survey under the Unregulated Contaminant Monitoring Rule, not a health-based compliance test. The system has no EPA health-based violations on record related to 1,2,3-TCP. For individual water assessment, testing your household supply is essential. The C-Series 1,2,3-TCP Filter ships ready to configure to provide treatment focused on reducing chlorinated solvent presence by relying on prolonged granular activated carbon contact time tailored to this challenging contaminant.

For more details, refer to the EPA's public water system records at https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-07-14. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Oakdale (MN1820016), MN: 12 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level