How Harris County's Public Water System Delivers Surface Water to Homes
The City of Houston provides water sourced from surface supplies to roughly 3 million residents through nearly a million connections in Harris County. This water undergoes treatment and distribution before reaching taps within individual residences. While this public water system includes monitoring for unregulated contaminants, the data represents system-wide measurements rather than any one household's water.
Why the Reporting Level for 1,2,3-Trichloropropane Is Significantly Lower Than for Common Metals
The federal survey records no detections of 1,2,3-trichloropropane, also known as 1,2,3-TCP or the chlorinated solvent TCP, above the reporting threshold of 0.03 micrograms per liter (µg/L), equivalent to 0.03 parts per billion (ppb). Reporting levels for such volatile organic compounds are set extremely low compared to metals like lead or iron due to their potential health implications and the sensitivity of measurement instruments. These low thresholds help identify even trace amounts in water to guide further analysis.
Why 1,2,3-Trichloropropane Resists Air Stripping and What That Means for Treatment Choice
1,2,3-TCP is a chlorinated solvent that does not easily transfer from water to air, which differentiates it from many other volatile organics. This resistance to air stripping means typical aeration treatment processes are ineffective for reducing TCP levels. Instead, water treatment technologies that rely on adsorption methods, such as granular activated carbon, are necessary to address 1,2,3-trichloropropane effectively at the household level.
The Role of Plumbing Material and Age, Separate From the Source Water
Even if public water monitoring finds no measurable 1,2,3-TCP in the supply, factors within a home’s plumbing can influence water quality independently. Older pipes or certain materials can contribute to chemical changes or introduce other compounds that do not originate from the surface water source. It is important to evaluate plumbing conditions separately when assessing water quality issues in a household, especially if existing treatment equipment has failed.
What 'Detected', 'Median', and 'Range' Mean in the Sampling Record on This Page
Government records for the City of Houston's public water system report zero detections of 1,2,3-trichloropropane above the 0.03 µg/L reporting level in 103 samples collected between 2013 and 2015. A 'detected' result means the compound was measured at or above this threshold; 'median' refers to the middle value of all samples, here indicating none were observed above the limit; and 'range' indicates the spread from the lowest to highest detected values. Because all samples were below the detection threshold, no further observations on distribution of concentrations apply.
Granular Activated Carbon Contact Time: Why Bed Depth Matters More for TCP Than for Taste
Treatment of chlorinated solvents like 1,2,3-TCP using granular activated carbon depends heavily on contact time between water and the carbon media. Unlike taste-related issues where surface area may suffice, effective 1,2,3-trichloropropane adsorption requires deeper carbon beds to increase the time water spends interacting with the media. This design consideration helps ensure that trace levels of chlorinated solvents can be addressed within residential treatment equipment.
Closing: The Single Test to Settle Your Household’s 1,2,3-TCP Treatment Needs
To determine your home's specific water quality regarding 1,2,3-trichloropropane, the essential step is to obtain a laboratory analysis of a water sample drawn from your tap. This test will provide precise measurements of TCP concentration in your household water, since public water records reflect system-wide conditions not individual homes. Based on this data, you can decide if configuring an Autotrol 1,2,3-TCP Filter, which ships ready to configure, is appropriate to address your water treatment challenges after equipment failure.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-04-21. 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 Houston (TX1010013), TX: 103 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
- ✓ 90-Day Money-BackNo restocking fees — return within 90 days.
- ✓ Manufacturer WarrantyGenuine Fleck · Pentair · VIQUA equipment.
- ✓ Free Expert SizingTalk to a specialist and buy the right system the first time.