Public records from the EPA's unregulated contaminant monitoring rule (UCMR3) confirm that the City of Fresno’s public water system detected 1,2,3-trichloropropane (1,2,3-TCP) in some samples between 2013 and 2015. The highest measurement recorded was 0.15 micrograms per liter (µg/L), with 8 detections above the reporting level of 0.03 µg/L out of 386 samples taken. Importantly, there are no health-based violations on record for this system related to 1,2,3-TCP or other contaminants.
How 1,2,3-TCP Enters Water Sources in Fresno
1,2,3-TCP is an industrial chemical that can enter surface water and groundwater through historical use of certain pesticides, soil fumigants, and as an industrial solvent byproduct. In Fresno, where the water supply is primarily surface water, trace levels detected reflect regional environmental persistence rather than current discharges. Contaminant movement into the distribution system occurs via treated surface water sources, and detections represent system-wide monitoring, not individual homes.
Judging Treatment Capacity for Household Daily Needs
To address 1,2,3-TCP at home, households should consider typical daily water use and select a filtration system sized accordingly. The total water volume processed per day affects how long a filter can efficiently reduce 1,2,3-TCP before maintenance or replacement is needed. Estimating household demand—based on occupants and activities like cooking, drinking, and bathing—helps match treatment equipment capacity to real use. The Fleck 1,2,3-TCP Filter ships ready to configure for this purpose and is designed to reduce this constituent effectively at residential volumes.
Comparing Fresno’s 1,2,3-TCP Record With Neighboring Counties
While Fresno showed a handful of detections between 0.03 and 0.15 µg/L during EPA monitoring, neighboring counties may have different patterns due to variations in industrial history, pesticide application, and water source types. Comparing these records can provide context but should not lead to assuming similar conditions for any single home or well. Regional data help understand environmental persistence but do not substitute for individual water testing.
Additional Questions for Commercial or Industrial Operators
Commercial and industrial water users must consider larger volumes, potential equipment sensitivities, and regulatory compliance beyond residential concerns. These users often require detailed water quality assessments specific to their processes and may evaluate long-term operational impacts of 1,2,3-TCP presence. Residential water use patterns and treatment needs differ significantly from these, lessening the relevance of some commercial considerations for household owners.
Information to Record Before Seeking Treatment Advice
- Water source type (surface or well)
- Recent water quality test results if available
- Household water usage estimates (persons, uses)
- Any known plumbing system details
- Specific concerns about water taste, odor, or staining
Having this information on hand streamlines communication and helps identify appropriate treatment equipment capacities and options.
Understanding Certified Laboratory Test Results for 1,2,3-TCP
Laboratory reports measure 1,2,3-TCP concentration in micrograms per liter (µg/L). A detection means the chemical was measured above the lab’s reporting level but is not a violation or indication of unsafe conditions. The test confirms the presence or absence and quantifies levels, guiding treatment decisions tailored to the household’s specific water. Testing is the only way to know a particular home's water quality, as regional data are not definitive for individual taps.
What Not to Conclude From Area Data
Regional detections of 1,2,3-TCP in Fresno's public water system do not mean any household’s water contains the same levels or that water is unsafe. No health-based violations have been recorded, and the presence of low-level detections alone is not a health finding. Homeowners should obtain their own water tests to accurately assess local conditions before deciding on treatment steps. The Fleck 1,2,3-TCP Filter offers a documented approach to reduce this constituent when needed.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-03. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for City of Fresno (CA1010007), CA: 386 results across 1 listed contaminants, 8 detections above the reporting level; no federal MCL
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