The Sacramento Suburban Water District supplies surface water to nearly 195,000 residents through more than 46,900 connections. This water passes through treatment and distribution before reaching household taps. Understanding reported monitoring results for 1,2,3-trichloropropane (TCP), a chlorinated solvent, can help homeowners in Sacramento County determine next steps if they are considering possible water quality issues.
If You Wonder Why the Reporting Level for TCP Is Much Lower Than for Metals
Federal monitoring for 1,2,3-trichloropropane uses a reporting level as low as 0.03 micrograms per liter (µg/L), which is equivalent to 0.03 parts per billion (ppb). This threshold is thousands of times lower than levels used for common metals such as iron or manganese because TCP is a synthetic organic compound linked to industrial and agricultural activities. This low threshold reflects sensitivity in detection instruments and caution in early monitoring rather than a defined health limit. The detection of TCP at or above this level in any system indicates the presence of this chlorinated solvent but is not itself a safety determination.
If You Are Interested in How a Fumigant Impurity from the Mid-20th Century Affected Groundwater
1,2,3-trichloropropane is known as a contaminant historically associated with soil fumigants used from the 1950s through the 1980s. These fumigants, applied for agricultural purposes, contained TCP as an impurity. Over decades, substances like TCP have migrated downward through soil layers and entered deep groundwater sources. Although Sacramento Suburban Water District's supply is surface water rather than groundwater, understanding this legacy explains why federal monitoring includes this compound. Persistence in the environment and complex transport processes mean that TCP continues to be evaluated nationally.
If You Need a Methodical Way to Rule Out Water Quality Concerns
Start by reviewing the public water system's federal monitoring record. For Sacramento Suburban Water District, 112 sample results recorded between February 2014 and August 2015 showed no detections of 1,2,3-TCP above the 0.03 µg/L reporting level. No maximum contaminant level (MCL) currently exists for TCP to compare against. To know your household water's TCP level, you will need to obtain an individual water quality test from a certified laboratory specifying 1,2,3-trichloropropane analysis. This test is more definitive than general water reports and distinguishes your home's unique conditions from the public system record.
If You Want to Understand Seasonal or Multi-Year Trends in Monitoring Data
Government monitoring for unregulated contaminants like TCP is often conducted over limited periods rather than continuously. In this case, samples from February 2014 to August 2015 were taken across the system. The consistent absence of detectable TCP occurrences during this monitoring window suggests stable conditions with no indication of emerging presence over that time. Variations outside this period are possible but undocumented here. Seasonal influences or changes in source water quality would require updated monitoring data to assess.
If You Are Considering Questions Beyond Household Water Quality, Such as for Commercial or Industrial Settings
Operators in commercial or industrial contexts may face additional regulatory or operational concerns regarding chlorinated solvents in water. Their water use intensity and processes might demand higher-frequency testing or alternative treatment approaches. In contrast, residential users focus primarily on health safety and aesthetic factors. Nonetheless, understanding the system-wide monitoring results provides context and helps prioritize individual testing needs.
If You Need Clarity About Terms Like "Detected," "Median," and "Range" in Public Sampling Records
In the Sacramento Suburban Water District's monitoring data, "detected" means the compound was measured above the reporting level of 0.03 µg/L in at least one sample. However, in this case, no detection occurred for TCP. "Median" and "range" describe distributions of measurements when detections exist. Here, the absence of detections means these statistics do not apply. Understanding these terms helps interpret what monitoring data imply and what they do not.
For Sacramento County households wanting to clarify their water's 1,2,3-trichloropropane level, the recommended step is to order a laboratory test specifically for TCP in your home water supply. This test will provide a precise concentration for your property and clarify whether treatment is warranted. If treatment is pursued, options such as the Pentair 1,2,3-TCP Filter, which ships ready to configure for residential use, can address this chlorinated solvent effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-08-19. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Sacramento Suburban Water District (CA3410001), CA: 112 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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