Government records for the Waipahu-Ewa-Waianae public water system in Honolulu County show that 1,2,3-trichloropropane (1,2,3-TCP), a chlorinated solvent, was detected intermittently in samples collected from 2013 to 2015. Four of thirty-nine samples registered concentrations above the reporting threshold of 0.03 micrograms per liter (µg/L), with a highest measured level of 0.44 µg/L and a median detection concentration of 0.201 µg/L. There are no EPA health-based violations on record for this system, indicating regulatory compliance during the monitoring period.
Granular Activated Carbon Contact Time: Why Bed Depth Matters More for TCP Than for Taste
In filtering household water impacted by 1,2,3-trichloropropane, contact time within a granular activated carbon (GAC) bed is crucial. TCP is resistant to simple air stripping and more persistent than many taste- or odor-causing compounds. Deeper carbon beds provide longer contact times, allowing sufficient adsorption of this chlorinated solvent. This contrasts with treatment focused on aesthetic issues where shallow beds may suffice. Thus, when addressing 1,2,3-trichloropropane specifically, ensuring a filtration medium capable of extended contact time is essential to gain measurable reductions.
How the Treated Water Differs at the Tap Once the Documented Technology Is in Place
Once a filtration approach designed for TCP is employed, tap water typically shows significantly lower levels of 1,2,3-trichloropropane. This reduction occurs because the chlorinated solvent molecules adsorb onto the granular activated carbon, diminishing their concentration. Users can expect improved water quality that aligns more closely with recommended guidelines for chlorinated solvent presence, though actual reductions depend on initial concentrations and filter maintenance. The Fleck 1,2,3-TCP Filter ships ready to configure for residential setups aiming to address this specific contaminant.
How Sample Depth, Well Depth or Source Type Changes What a Reader Should Expect
The Waipahu-Ewa-Waianae system utilizes groundwater sources, which can vary in vulnerability to chlorinated solvent presence based on well depth and local hydrogeology. Generally, deeper wells may be less affected by surface contaminants but could still show persistence of legacy solvents like 1,2,3-trichloropropane from historical land uses or soil fumigant residues. Sampling depth influences detection: shallow samples might capture transient contaminations, while deeper water tends to reflect long-term background levels. Understanding these factors helps interpret what concentrations in public water data signify for a specific household.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
The EPA data lists a median detection for 1,2,3-TCP of 0.201 µg/L (0.201 parts per billion) with the highest detected at 0.44 µg/L. For a homeowner, this means that when the chlorinated solvent was measured, values typically clustered near a fifth of a microgram per liter, with occasional higher readings under half a microgram per liter. Because these figures come from area-wide sampling, individual household water could be lower, higher, or undetected. Only a direct test of the home's water can clarify the actual level present at the tap.
How Public-System Records Differ from Private-Well Testing in What They Establish
Public water system records provide broad data about contaminant presence across large populations and numerous connections, offering a regional overview. They do not measure each household's water quality directly and cannot confirm specific conditions inside a single home’s plumbing. Private wells, by contrast, require individual testing to determine contaminant levels. Public-system data shows detected concentrations in the system-wide context and regulatory compliance but does not substitute for actual water testing at the household point of use.
How the Constituent Enters Groundwater or the Distribution System in This Region
1,2,3-Trichloropropane originates largely as a soil fumigant impurity used decades ago. In areas like Waipahu-Ewa-Waianae, historical agricultural activities contributed to its appearance in groundwater. The compound’s persistence and mobility enable it to leach into well water over time. Because the public system draws from groundwater, traces of this legacy chlorinated solvent occasionally appear in sampling. It can enter the distribution system through the treated groundwater feed but remains subject to regulatory monitoring and treatment protocols.
What Not to Conclude from Area Data
Residents should not infer their own home water contains a specific concentration of 1,2,3-TCP based solely on public water system data. Detection in regional samples indicates presence somewhere in the system but not uniformly or consistently in every connection. Also, detections below any federal maximum contaminant level do not indicate unsafe or non-compliant water. To understand individual water quality, specific testing of household water is required. The documented filtration equipment is a direct purchase option that ships ready to configure for homes in this area seeking targeted treatment of 1,2,3-trichloropropane.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-01-13. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Waipahu-Ewa-Waianae (HI0000335), HI: 39 results across 1 listed contaminants, 4 detections above the reporting level; no federal MCL