Understanding 1,2,3-TCP in Wayne County Water: What EPA Data Reveals About Detroit's Supply
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Whole House 1,2,3-TCP Reduction Water Filter System - Trichloropropane Removal
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Is 1,2,3-trichloropropane removed by air stripping from Detroit’s surface water supply?
A common belief is that air stripping is effective for treating many volatile organic compounds in water. However, 1,2,3-TCP is resistant to air stripping due to its chemical properties. This means that treatment approaches relying on air stripping will likely be ineffective for this chlorinated solvent if it were present at concerning levels. For Detroit’s water system, which relies on surface water, alternative treatment technologies are appropriate when addressing TCP.
Why is the reporting level for 1,2,3-TCP set much lower than for common metals?
The EPA’s monitoring program for unregulated contaminants, including 1,2,3-TCP, uses a reporting level of 0.03 micrograms per liter (µg/L), or parts per billion (ppb). This level is thousands of times lower than typical reporting limits for metals like lead or arsenic. The lower threshold reflects the desire to detect even trace amounts of this chlorinated solvent in drinking water. It does not imply a violation or health-based exceedance, only that analytical methods are sensitive enough to find very low concentrations.
What additional considerations do commercial or industrial water users have that households do not?
Commercial and industrial operations often require more detailed assessments of water quality due to larger volumes and specific process needs. They might test for a wider range of disinfection byproducts or volatile organics, including TCP at variable intervals. Households, in contrast, typically rely on municipal water quality reports and occasional private well testing to understand their water quality status.
How do plumbing materials and age affect 1,2,3-TCP presence compared to source water?
The presence of 1,2,3-TCP in tap water is a function of its source concentration rather than plumbing conditions. Plumbing materials and system age generally influence other water qualities such as corrosion or metal leaching but are not sources or modifiers of chlorinated solvents like TCP. Therefore, if 1,2,3-TCP were detected, it would stem from source water or treatment rather than household plumbing.
How is 1,2,3-trichloropropane different from other common water issues households face?
1,2,3-TCP, a chlorinated solvent, differs fundamentally from well-known issues like lead or microbial contamination. It is a synthetic chemical historically used in industrial applications and soil fumigation, not naturally occurring in water. Its detection in water is rare and usually linked to specific environmental contamination. Unlike problems such as hardness or sediment, which affect taste and appliance life, TCP concerns focus on chemical presence at trace levels.
How does California’s 5 nanograms per liter advisory compare to the absence of a federal maximum contaminant level?
California has set a public health goal of 5 nanograms per liter (ng/L) — equivalent to 0.005 µg/L or parts per billion — for 1,2,3-trichloropropane in drinking water. This is more stringent than the federal program’s reporting level and reflects state-level caution. The federal Safe Drinking Water Act does not currently include a maximum contaminant level (MCL) for TCP. The Detroit water system record shows no health-based violations for any contaminants, including TCP, based on EPA monitoring.
In summary, Detroit’s public water system serving Wayne County has no EPA record of health-based violations concerning 1,2,3-TCP. The chlorinated solvent resists air stripping, so treatment choices must align accordingly. Understanding government data helps households evaluate if further private testing or thoughtful treatment configuration, such as with the Pentair 1,2,3-TCP Filter, may be warranted for their unique water concerns.
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 City of Detroit (MI0001800), MI: 16 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level