The Role of Plumbing Material and Age, Separate from the Source Water
When considering 1,2,3-trichloropropane (1,2,3-TCP) in your household water, it's important to distinguish between contamination originating from the water source and potential effects introduced by your home's plumbing system. Plumbing materials like certain plastics or older pipes can sometimes interact with water constituents, but 1,2,3-TCP is typically not generated by household plumbing. Rather, it is a synthetic chemical historically used in industrial applications, so its presence usually traces back to the water source itself, in this case groundwater.
Knowing this helps you focus your concerns and testing on the source water quality. Plumbing might affect other water quality aspects, but 1,2,3-TCP presence or absence relates primarily to environmental contamination impacting the supply.
How Public-System Records Differ from Private-Well Testing in What They Establish
The data available for Honolulu-Windward-Pearl Harbor's public water system comes from federal monitoring programs that measure 1,2,3-TCP levels in the system's groundwater supply as a whole. These results represent sampling across numerous system points servicing over 600,000 residents and more than 100,000 connections. However, this broad data differs from testing your private household well or tap water, which reflects your specific location, plumbing, and local conditions.
Community-wide results indicate that 1,2,3-TCP was detected in a small number of samples but without any exceedance of health-based thresholds or regulations. This means while some measurement occurred in the system, it does not establish the concentration delivered to any particular home. Individual testing is necessary to understand your unique water quality.
What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
The EPA's Unregulated Contaminant Monitoring Rule (UCMR3) data for the Honolulu system show that out of 99 sampled results, 3 detected 1,2,3-TCP above the reporting level of 0.03 micrograms per liter. The highest measured concentration was 0.04 micrograms per liter, and the median of detected values was 0.033 micrograms per liter. Detected means that measurement instruments found some level of the chemical, not that the water fails any safety standard.
The range from 0.03 (reporting level) to 0.04 μg/L indicates minor variation in measured 1,2,3-TCP levels during sampling. These results serve as indicators of presence or absence in the system, rather than definitive statements about safety or health impacts.
How Seasonal or Multi-Year Variation Shows in the Record (Dates and Ranges Given)
Sampling for 1,2,3-TCP in Honolulu's public water system took place between April 2013 and July 2014, providing a snapshot over about fifteen months. This timeframe captures some seasonal variation but does not reflect long-term trends beyond that period. Fluctuations in 1,2,3-TCP levels could occur with shifts in groundwater conditions, rainfall patterns, or contamination sources over time.
Understanding this limitation means you should consider that water quality can vary outside the sampling window. Continuous monitoring or repeated testing of your home's water offers a clearer picture of current conditions compared to historic data alone.
How to Compare This Area's Record with a Neighboring County's Without Overreading It
When comparing 1,2,3-TCP results from Honolulu to measurements from nearby counties, keep in mind that each geographic area has distinct water sources, industrial histories, and environmental exposures. Differences in detection rates or levels do not automatically indicate better or worse water quality but may reflect local variations.
Since Honolulu's system recorded only a few detections at low levels without health-based violations, a neighboring county's data showing different figures should be viewed in context. Each public water system's record is specific to its own water quality conditions and monitoring efforts.
Next Step: Testing Your Home Water for 1,2,3-TCP to Decide on Treatment
To determine which category of water treatment is appropriate for your household, the crucial action is an individual test of your home's water for 1,2,3-TCP concentration. This test can establish whether 1,2,3-TCP is present and at what level, clarifying your actual exposure rather than relying solely on regional public system data.
If your test indicates measurable 1,2,3-TCP, a targeted solution like the C-Series 1,2,3-TCP Filter, which ships ready to configure, may be considered to address it effectively. This technology is designed to remove 1,2,3-TCP specifically, helping households manage their water quality based on confirmed conditions.
By focusing on accurate, current testing of your water, you can make an informed choice that fits your household's needs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-07-15. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Honolulu/Windward/Pearl Harbor (HI0000331), HI: 99 results across 1 listed contaminants, 3 detections above the reporting level; no federal MCL