1,2,3-TCP in PR Residential Water: How Local Data Guides Household Treatment Choice

Are you wondering if 1,2,3-TCP is a concern for your household water in Puerto Rico and what treatment might help? Government data from Aguadilla’s public water system shows no detections of 1,2,3-trichloropropane, also called TCP, above the reporting level. This means that while 40 tested samples returned no measurable levels above 0.03 micrograms per liter (0.03 parts per billion), individual well tests are needed for your home’s water quality. Two main technical approaches can address TCP should testing indicate it is present.

The agricultural land-use history of the region and how it maps onto detections

Historic farming and pesticide use from mid-20th century

Puerto Rico, including the Aguadilla area, had agricultural practices involving soil fumigants in the 1950s through the 1980s. These fumigants sometimes contained impurities such as 1,2,3-trichloropropane.

Detection patterns align with legacy soil fumigants

Sampling in Aguadilla found no measurable 1,2,3-TCP in public water samples, indicating limited or no current impact from past agricultural land use within this system.

How a soil fumigant impurity from the 1950s-1980s reached deep groundwater decades later

Slow migration from surface to aquifers

1,2,3-trichloropropane, formed as an impurity in fumigants used decades ago, can leach from soil into groundwater over years due to its chemical persistence.

Time lag between use and groundwater presence

Decades-long delay explains why historic use might result in recent detections in some regions, though Aguadilla samples show no detections above reporting limits.

How the documented treatment technology removes or neutralises the constituent

Technical approach 1: Activated carbon filtration

This method adsorbs chlorinated solvents like 1,2,3-trichloropropane, reducing their presence in water. The Autotrol 1,2,3-TCP Filter uses this proven technology and ships ready to configure for household use.

Technical approach 2: Advanced oxidation processes

These use reactive species to chemically transform chlorinated solvents into less harmful substances. While effective, they typically require complex configuration not provided by direct-purchase systems like the Autotrol Filter.

How many samples and wells stand behind the figures, and what a small sample means

Sampling scope for Aguadilla public water system

Forty samples collected between 2015 and 2016 provide a snapshot of the public system’s water quality regarding 1,2,3-TCP.

Limitations of sample size and area coverage

While reassuring, these samples do not guarantee the absence of 1,2,3-trichloropropane in every well or household water source. Individual testing remains necessary.

How the constituent enters groundwater or the distribution system in this region

Legacy contamination from historical soil fumigants

TCP can seep through soil layers and contaminate aquifers supplying groundwater wells.

Potential for distribution system entry

If groundwater contains 1,2,3-trichloropropane, it can enter the water distribution system unless effectively treated.

A worked example: reading the record's median and range as a homeowner would

Understanding no detected levels

The zero detections across 40 samples mean the median concentration falls below 0.03 µg/L (0.03 ppb), but this is a reporting threshold, not an absolute guarantee of absence.

What this means for your household

Your well water or tap water might differ; testing your specific source is essential before deciding on treatment.

What you should NOT conclude from area data

The absence of 1,2,3-TCP detections at the public system level does not prove it is absent from individual household water supplies. Also, no detection in the regional record is not a health safety violation or failure of the water system.

If tests of your water find 1,2,3-trichloropropane, choosing between treatment options such as adsorption filters—like the Autotrol 1,2,3-TCP Filter ready to configure—or advanced oxidation technologies depends on your specific water chemistry and household priorities.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2016-12-11. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Aguadilla (PR0003293), PR: 40 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level