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What do government water sampling records say about 1,2,3-TCP in Sacramento County?

The Sacramento Suburban Water District, serving part of Sacramento County, has a public water system record that includes federal monitoring for 1,2,3-trichloropropane (1,2,3-TCP). Between 2013 and 2015, 112 samples were analyzed with none detected above the reporting level of 0.03 micrograms per liter (µg/L), or 0.03 parts per billion (ppb). This data indicates no measurable 1,2,3-TCP at or above this level in the system's supplied water during that time frame. The system has no health-based violations related to 1,2,3-TCP on record.

Why does 1,2,3-trichloropropane resist air stripping, and what does that mean for treating it?

1,2,3-TCP is a chlorinated solvent known for its chemical stability and low volatility, which means it does not readily evaporate into the air during water treatment. Air stripping, a method that removes volatile compounds by transferring them to the air, is ineffective against 1,2,3-TCP because it remains in the water rather than volatilizing. Treatment approaches must therefore focus on filtration or other methods capable of targeting less volatile chlorinated solvents.

How did 1,2,3-TCP from soil fumigants decades ago end up in groundwater?

Historically, 1,2,3-TCP was an impurity found in soil fumigants used extensively between the 1950s and 1980s. Over time, this chlorinated solvent migrated downward from treated soils deep into groundwater reservoirs. This slow movement means 1,2,3-TCP residues can persist in aquifers long after fumigant use ceased. The surface water source of the Sacramento Suburban Water District is less likely to reflect this deep groundwater contamination, aligning with the non-detect findings in federal monitoring.

How does California's 5 ng/L state limit for 1,2,3-TCP compare with the lack of a federal maximum contaminant level?

California enforces a strict state drinking water notification level of 5 nanograms per liter (ng/L), equivalent to 0.005 micrograms per liter (µg/L) or 0.005 parts per billion (ppb), which is below the federal reporting level of 0.03 µg/L. The federal government has not set a maximum contaminant level (MCL) for 1,2,3-TCP, so compliance with California's limit is a separate state requirement rather than a federal standard. Sacramento's public water system monitoring did not detect 1,2,3-TCP above the federal reporting threshold, indicating compliance with federal metrics, though different state guidelines can be more sensitive.

What role do plumbing materials and the age of household plumbing play in 1,2,3-TCP presence?

The public water system’s data describes water quality at the treatment and distribution points, not within individual household piping. The material and age of household plumbing can influence water quality at the tap but do not introduce or remove 1,2,3-TCP, which is a chlorinated solvent unlikely to form in household plumbing. Testing your home's water specifically is necessary to assess any variation caused by plumbing conditions separate from source water quality.

How should households proceed in ruling out potential sources of 1,2,3-TCP from cheapest to more detailed tests?

Start with the water bill or contact local officials to confirm your water provider and review system water quality reports. Next, test your household water for 1,2,3-trichloropropane through a certified laboratory capable of analyzing at or below state detection limits. This can ensure your specific water reflects broader system monitoring or detect concentrations if present. Plumbing materials and patterns of water use can then be evaluated if anomalies appear.

How can Sacramento County water records be compared with neighboring counties without overinterpreting data?

Each county’s groundwater and surface water profiles can vary substantially due to differences in industrial history, agricultural practices, and geology. Comparing Sacramento County’s public water system record for 1,2,3-TCP with neighboring counties requires caution; absence or presence in one does not predict individual household water elsewhere. System records provide regional snapshots rather than precise household assurances.

What is the crucial test a Sacramento household should order to clarify their 1,2,3-TCP situation?

The definitive action is to have your household water sample analyzed by a laboratory for 1,2,3-trichloropropane at detection levels meeting or exceeding California’s 5 ng/L requirement. A result below this very low threshold can confirm your water does not contain measurable 1,2,3-TCP, matching federal and state assessments of the public water system. If levels are found that concern you, technologies such as the Autotrol 1,2,3-TCP Filter, which ships ready to configure, offer a documented approach to addressing this chlorinated solvent.

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