This week you must decide how to make sense of 1,2,3-TCP findings related to your Fresno home's water and what to do next.
1. Which Fixtures, Appliances, or Processes Are Affected First and Why
1,2,3-trichloropropane (1,2,3-TCP) is a synthetic chemical historically used in industrial applications and as a soil fumigant. If present in water, it mainly affects water used for drinking, cooking, and bathing, where direct human contact occurs. Fixtures such as kitchen faucets and bathroom taps are the primary points of exposure. Water used for irrigation or laundry generally has less concern regarding this compound. Understanding which points of water use involve ingestion or skin contact helps prioritize where to focus attention.
2. The Role of Plumbing Material and Age, Separate From the Source Water
Your home's plumbing can influence water quality characteristics independently of the source. Older plumbing with degraded materials may interact with chemicals differently, but it does not produce 1,2,3-TCP itself. The detected 1,2,3-TCP in Fresno's public water system comes from the source or treatment processes, not pipes. However, plumbing materials may affect how water tastes, smells, or looks, which can sometimes be mistaken for chemical concerns.
3. What the Reader Should Write Down Before Asking Anyone for Treatment Advice
- Note the water system serving your address — in Fresno, the City of Fresno system serves over 545,000 people.
- Record any local water quality reports you have, especially those indicating 1,2,3-TCP sampling results.
- Verify if water is sourced from surface water or groundwater (Fresno’s system uses surface water).
- Gather any past certified laboratory tests for your household water focused on 1,2,3-TCP.
- Observe which plumbing fixtures show water quality issues most prominently.
4. How Seasonal or Multi-Year Variation Shows in the Record (Dates and Ranges Given)
Fresno’s public water system underwent federal monitoring from August 2013 to December 2015 for 1,2,3-TCP under the EPA’s Unregulated Contaminant Monitoring Rule (UCMR3). Over this period, 386 samples were collected, with 8 results detecting 1,2,3-TCP above the reporting level of 0.03 micrograms per liter (µg/L). The highest detected concentration was 0.15 µg/L, and the median of detections was 0.054 µg/L. These detections do not indicate violations or unsafe conditions but reflect periodic presence during the sampling timeframe. Temporal variations may occur due to source water changes, treatment adjustments, or environmental factors, so results can fluctuate across years and seasons.
5. What a Certified Laboratory Test for This Constituent Reports and How to Read It
A certified lab test for 1,2,3-TCP will report the concentration in micrograms per liter (µg/L) or parts per billion (ppb). It is critical to understand that detection means the chemical was measured; it does not mean the water is unsafe or fails any legal threshold. There is currently no federal maximum contaminant level (MCL) set for 1,2,3-TCP, so no exceedance status applies. If your home’s test shows 1,2,3-TCP, compare the result with regional data like Fresno’s system records to contextualize it. Only a certified test of your water can confirm your home’s specific levels, as regional data covers the entire public water system.
Choosing how to address 1,2,3-TCP concerns involves understanding affected fixtures, separating plumbing factors, collecting detailed notes, reviewing area sampling data over time, and interpreting certified laboratory results carefully. The C-Series 1,2,3-TCP Filter ships ready to configure and offers a targeted approach for households seeking reduction of 1,2,3-TCP in their water supply.
Following these steps equips you to make informed decisions about assessing and managing 1,2,3-TCP in Fresno household water.
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