Washington County’s drinking water for the Oakdale public water system comes from groundwater sources, serving over 30,000 people through more than 9,400 connections. Federal testing recorded no health-based violations for this system, indicating regulatory standards are met for all monitored contaminants, including 1,2,3-trichloropropane (TCP).
If You Need to Understand Granular Activated Carbon Contact Time for 1,2,3-TCP
When treating 1,2,3-trichloropropane, the contact time between water and granular activated carbon (GAC) is especially critical. The depth and residence time of the carbon bed influence its ability to adsorb TCP molecules effectively. Compared to contaminants affecting taste or odor, TCP molecules may require longer exposure to carbon media for satisfactory reduction. Shorter carbon beds that suffice for some aesthetic issues might be less effective for TCP.
If You Wonder Why the Reporting Level for 1,2,3-TCP Is Much Lower Than for Many Metals
The detectable threshold for 1,2,3-TCP is set at 0.03 micrograms per liter (µg/L), equivalent to 0.03 parts per billion (ppb). This level is thousands of times lower than detection levels for common metals in drinking water testing. The low reporting level reflects the sensitivity of modern instruments and precaution rather than a violation of safety standards. It means federal tests can measure very small amounts without implying risk.
If You Plan to Gather Information Before Considering Treatment
- Note whether your household water is supplied by the Oakdale public water system or an individual well.
- Obtain a certified water quality test specifically measuring 1,2,3-trichloropropane concentration in your tap water, as local system results cannot substitute for your sample.
- Document any other water quality concerns or characteristics relevant to treatment decisions.
If You Want to Compare Washington County’s Record With a Neighboring Area Without Overreading
Washington County’s public water system monitoring from 2013 to 2015 showed no detections of TCP above the reporting level. Neighboring counties may have different geology, groundwater depths, and historical land use affecting their own measurements. Differences in TCP detection do not directly reflect safety or risk in your household water but help understand regional trends.
If You Consider the Maintenance Rhythm of the Documented Technology
The Autotrol 1,2,3-TCP Filter, designed to address chlorinated solvents like TCP, ships ready to configure with your plumbing. Its carbon media requires routine monitoring and replenishment or replacement to maintain effectiveness. The maintenance schedule depends on water usage and detected TCP levels and ensures the system continues to provide the intended quality improvement without interruption.
In summary, Washington County’s groundwater feeding the Oakdale system shows no federal detections of 1,2,3-TCP above reporting limits, though individual household water quality requires specific testing. Understanding factors such as carbon contact time, reporting level context, and maintenance helps in making informed decisions about addressing this chlorinated solvent if present.
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