Understanding 1,2,3-TCP in LA Household Water: Insights from Parish Water Company EPA Data
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Whole House 1,2,3-TCP Reduction Water Filter System - Trichloropropane Removal
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What does the EPA data say about 1,2,3-TCP levels in Parish Water Company water?
The EPA's public water system records for Parish Water Company in Louisiana, serving a sizable population through thousands of connections, report zero detections of 1,2,3-trichloropropane (1,2,3-TCP) above the detection limit of 0.03 micrograms per liter (µg/L) or 0.03 parts per billion (ppb) during the 2013-2015 monitoring period under the Unregulated Contaminant Monitoring Rule (UCMR3). This monitoring is a federal occurrence survey and not a compliance test; no federal maximum contaminant level (MCL) exists for this chlorinated solvent. Importantly, the system has no EPA-recorded health-based violations related to 1,2,3-TCP or any other contaminant.
Why is the reporting level for 1,2,3-TCP so much lower than for common metals?
The reporting threshold of 0.03 µg/L for 1,2,3-trichloropropane is thousands of times lower than typical detection limits for common metals because TCP is a synthetic chlorinated solvent historically used in soil fumigants and industrial applications, making even trace detections scientifically significant. The low detection limit reflects the advances in analytical methods that allow identification of minute concentrations, enabling early awareness. Unlike metals that may occur naturally at higher concentrations, 1,2,3-TCP is an anthropogenic chemical, so regulators maintain a very sensitive threshold to observe any presence, although no federal health standard currently exists.
How does historical agricultural land use in Louisiana relate to 1,2,3-TCP detections?
1,2,3-trichloropropane was an impurity in soil fumigants widely used mainly from the 1950s through the 1980s. Agricultural regions employing these chemicals might experience residual chlorinated solvent traces in groundwater decades later. Parish Water Company's service area includes agricultural land, which historically could have contributed to TCP occurrences in deeper groundwater. Nevertheless, the EPA's monitoring from 2013-2015 found no detectable TCP at or above 0.03 µg/L in samples from this system, indicating that any legacy contamination, if present, currently measures below this sensitive reporting level.
What changes should large households or seasonal properties consider regarding 1,2,3-TCP?
The presence or absence of 1,2,3-TCP in water does not inherently differ by household size or usage patterns, but larger households or seasonal homes may experience differences in water usage affecting water age and flow rates through plumbing. Stagnant water in less frequently used properties can slightly change contaminant profiles at fixtures, though 1,2,3-TCP is unlikely to accumulate in household plumbing materials. Water from Parish Water Company has not shown TCP detections above reporting limits in sampling from the system. Nonetheless, if a property has a unique or private well, individual testing is advisable, especially for intermittent use homes.
How many samples underpin Parish Water Company's 1,2,3-TCP data, and what does sample size imply?
The dataset comprises 40 samples tested during the 2013-2015 UCMR3 monitoring period. While this is a limited number compared with continuous daily testing, it is a federally mandated snapshot providing valuable occurrence information at the system level rather than individual household water. A small sample size means there could be variations undetected in less sampled locations or times, but the zero detections at the reporting level provide reasonable assurance that TCP concentrations in the public system water, during the sampling timeframe, were very low or absent.
Which parts of household water use might reflect 1,2,3-TCP presence first?
1,2,3-trichloropropane is a small, chlorinated organic compound that can dissolve in water but does not bioaccumulate in plumbing or typical piping materials. In the unlikely event it appears at low levels, the first points reflecting its presence would be cold water taps used for drinking or cooking, where water comes directly from the municipal system. Appliances that use water without heating (like ice makers) could also register the contaminant first. Hot water fixtures generally do not concentrate chlorinated solvents differently than cold water. Because Parish Water Company’s record shows no TCP detected at the reporting level, these concerns are primarily hypothetical but explain why household testing targets water at the point of use.
What is the best way for a homeowner to determine their own household water TCP level?
Since the EPA data only reflect the public water system and sampling period, the only way to know the 1,2,3-TCP concentration in an individual home’s water is to order a specific water test for 1,2,3-trichloropropane, arranged through a certified laboratory. This test must analyze for TCP at or below the 0.03 µg/L (ppb) level to align with federal reporting thresholds. A result below this level would confirm no detectable TCP, consistent with the Parish Water Company’s system-wide findings. For households served by private wells or with older plumbing, testing is strongly recommended to distinguish their water quality confidently.
If a homeowner confirms measurable 1,2,3-TCP in their household water, the Autotrol 1,2,3-TCP Filter offers a documented, ready-to-configure option that targets this chlorinated solvent effectively, helping manage its presence at the point of use.
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