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Government Sampling Records for 1,2,3-Trichloropropane in Clinton’s Water System

The EPA’s public water system record for IA American Water Co. - Clinton District, serving Clinton, IA, reports no detections of 1,2,3-trichloropropane (also known as 1,2,3-TCP or TCP) above the reporting level of 0.03 micrograms per litre (µg/L) or parts per billion (ppb) in eight samples taken between November 2013 and May 2014. While this federal unregulated contaminant monitoring rule (UCMR3) survey does not establish compliance with a health-based limit—since none exists for this solvent—it provides insight into water quality trends at the system level, rather than at individual household taps.

Why the Reporting Level for This Chlorinated Solvent Is Much Lower Than for Common Metals

Unlike metals such as lead or copper, TCP is a synthetic chemical with different toxicological concerns, leading regulators to set extremely low thresholds for detection. The 0.03 µg/L reporting level is thousands of times lower than many metal monitoring thresholds. This stringency reflects the need to observe even trace amounts for long-term exposure studies and precautionary measures. However, the low reporting level is not a regulatory limit or a safety standard but a level chosen to guide further investigation.

Regional Agricultural Land Use and Its Relation to 1,2,3-TCP Occurrence

Clinton County’s land-use history includes extensive agriculture, which is relevant because 1,2,3-trichloropropane was historically used as a soil fumigant impurity during the mid-20th century. Residual contamination can leach into groundwater decades later, particularly in regions with significant farming activity. The lack of detects in the current public water system record suggests that the groundwater sources serving Clinton have not shown measurable levels of TCP above detection limits during the monitoring period.

Additional Considerations for Commercial or Industrial Water Users

Commercial or industrial operators face unique water demand patterns and regulatory requirements that differ from those of residential households. They must address larger volumes and potential process sensitivities to chlorinated solvents. Unlike households, these operators often require specialized treatment capacity assessments and may need to meet stricter contracts or permits. Residential concerns primarily focus on water quality for daily use.

Potential Effects of Long-Term Untreated Exposure to TCP in Water

TCP is a chlorinated solvent with potential health implications under prolonged exposure, although no current federal maximum contaminant level (MCL) exists to quantify risk definitively. Untreated presence in water over many years may raise concerns about chronic effects, but as the Clinton system records show, detectable TCP was not found at or above the reporting threshold. Testing at the household level remains the only way to ascertain individual water quality.

Aesthetic Secondary Standards Versus Health-Based Limits Applied to TCP

Secondary standards from agencies like the EPA address aesthetic factors such as taste, odor, and staining. For TCP, which lacks an established secondary or aesthetic guideline, these factors are not applicable. The absence of health-based violation in the Clinton water record confirms that regulatory focus remains on monitoring and research rather than aesthetic assessment for this solvent.

Understanding Certified Laboratory Testing for 1,2,3-Trichloropropane

Obtaining a certified laboratory test provides a direct measurement of 1,2,3-TCP in a household water sample. Results report the concentration in micrograms per litre (µg/L), which can be read alongside the EPA monitoring reporting level of 0.03 µg/L (ppb). Such testing clarifies the specific water condition at a home, since system-wide data cannot determine individual tap quality. Interpreting these results helps homeowners decide on treatment needs.

Existing household water equipment may not be optimized for TCP challenges, especially as demand or usage patterns change. The Autotrol 1,2,3-TCP Filter ships ready to configure and offers a documented technology solution designed for addressing chlorinated solvents like TCP when water treatment upgrades become necessary.

This page has reviewed government sampling data, the reasons for low reporting levels, regional agricultural factors, commercial user considerations, effects of untreated solvent presence, the role of aesthetic standards, and laboratory testing interpretation. Together, these points support informed decisions about testing and treatment for 1,2,3-trichloropropane in Clinton household water.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2014-05-12. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for IA American Water Co. - Clinton District (IA2326048), IA: 8 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level