Household Water Equipment Failure and 1,2,3-TCP Concerns in LA: Understanding Local Public Water Records

The Parish Water Company system serving parts of Louisiana has been monitored for 1,2,3-trichloropropane (1,2,3-TCP) through EPA's Unregulated Contaminant Monitoring Rule (UCMR3) between May and November 2013. The system recorded 40 samples with no detections above the reporting level of 0.03 micrograms per liter (µg/L), or 0.03 parts per billion (ppb), and no federal maximum contaminant level (MCL) applies to this compound. This data reflects the water system as a whole, and individual household water quality requires separate testing.

Why is the reporting level for 1,2,3-trichloropropane set so much lower than for common metals?

The reporting level for 1,2,3-TCP is very low compared to other substances because it is a synthetic chlorinated solvent recognized as a potential carcinogen. Although no MCL exists for it, federal monitoring programs establish a very sensitive detection threshold to identify even minimal concentrations that could warrant future evaluation. In contrast, common metals often have higher allowable limits due to their differing chemistry and health impact profiles. This explains why a detection above 0.03 µg/L is significant from a monitoring standpoint but is not a violation or an indication of unsafe water on its own.

Why does 1,2,3-trichloropropane resist removal by air stripping, and what does this mean for treatment choice?

1,2,3-TCP is a chlorinated solvent that is not effectively removed by air stripping because it has low volatility compared to other volatile organic compounds. This chemical property means that treatment methods relying on transferring contaminants into the air, such as simple aeration, do not adequately address this constituent. Instead, filtration technologies that use adsorption, such as granular activated carbon or systems specifically designed to target 1,2,3-trichloropropane, provide a documented approach for reducing its presence in water.

How do public water system records differ from private well testing in what they establish?

Public water system monitoring results, like those from Parish Water Company, represent the overall quality of the water supply as delivered to the community. These data do not describe the specific water conditions that an individual household experiences, especially after point-of-entry treatment equipment failure. Private well testing is the only way to determine household water concentrations because well water quality can vary based on depth, location, and plumbing materials. Therefore, after existing equipment stops working, an individual test for 1,2,3-TCP and other constituents in your home water is essential to understand your specific situation.

How did a soil fumigant impurity from the 1950s-1980s reach deep groundwater decades later?

1,2,3-trichloropropane originated as an impurity in soil fumigants widely used in agriculture from the 1950s through the 1980s. Due to its chemical stability and persistence, this chlorinated solvent slowly migrated through soil layers over decades, eventually reaching deep groundwater sources. Its delayed arrival explains why monitoring programs continue to include it despite discontinued historical use. The presence or absence in modern water sources depends on local historical land use, hydrogeology, and contaminant transport processes.

How does the documented treatment technology address 1,2,3-TCP in water?

The Autotrol 1,2,3-TCP Filter is designed to reduce 1,2,3-trichloropropane concentrations in household water. It employs filtration technology tailored to adsorb this chlorinated solvent, overcoming difficulties posed by its resistance to air stripping. This equipment ships ready to configure, providing a directly purchasable option for homeowners whose previous treatment solutions have failed or are inadequate for this specific contaminant. Its use is based on documented laboratory and field performance data for lowering 1,2,3-TCP levels.

What does the agricultural land-use history of the region tell us about 1,2,3-TCP detections?

The area served by Parish Water Company includes agricultural lands historically treated with soil fumigants containing 1,2,3-TCP impurities. This background explains why federal monitoring includes this constituent in water samples from the region, even if current detections are below reporting thresholds. Understanding this land-use history helps interpret monitoring results and guides decisions on water testing and treatment needs for individual homes, especially when older treatment equipment no longer functions effectively.

What water test should you order next? Because the public water system record does not reflect your household's specific water after equipment failure, you should order a water quality test that includes 1,2,3-trichloropropane at or below 0.03 µg/L detection capability. A result below this level would indicate that 1,2,3-TCP is not currently a measurable concern in your home water. If detectable levels appear, the Autotrol 1,2,3-TCP Filter offers a practical technology to address this constituent directly.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2013-11-09. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Parish Water Company (LA1033019), LA: 40 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level