If you notice your household water might be affected by 1,2,3-trichloropropane (TCP) or have questions about its presence, understanding what government water quality data shows for your area can clarify your next steps.
If your water feels resistant to air stripping treatment methods
1,2,3-TCP is a chlorinated solvent that does not readily vaporize at typical water treatment conditions, making air stripping an ineffective approach for its reduction. This chemical trait means that conventional aeration will not significantly lower TCP concentrations in water. Consequently, specialized filtration technology designed for TCP is necessary to address this issue in household water supply.
If you are considering the significance of California's 5 ng/L 1,2,3-TCP guideline compared to no federal MCL
While there is currently no federal maximum contaminant level (MCL) established for 1,2,3-trichloropropane, California’s public health goal sets a limit of 5 nanograms per liter (ng/L), or 0.005 micrograms per liter (µg/L), to guide water quality management. This level is much lower than the EPA’s laboratory reporting threshold of 0.03 µg/L (30 ng/L) used in federal monitoring. The Bolling Water System in Washington, DC, was monitored under EPA’s Unregulated Contaminant Monitoring Rule (2013–2015) and found no detections above 0.03 µg/L for 1,2,3-TCP. This indicates that while federal data does not suggest a problem, states with stricter goals may use lower benchmarks when evaluating water quality.
If you want to understand how agricultural land use relates to 1,2,3-TCP detections nearby
1,2,3-TCP can be a residual contaminant from historical use of certain soil fumigants and pesticides, often linked to agricultural activities. In DC, urban land use and limited agriculture reduce this as a widespread source, which aligns with the non-detection in the Bolling Water System’s monitoring records. Knowing your local land-use history may inform expectations about potential TCP presence but does not substitute for direct water testing to confirm household water quality.
If you compare public water system records to private well tests for 1,2,3-TCP presence
Federal monitoring results represent the water provided by the public system before it reaches individual taps, summarizing quality at the system level. They do not reflect water quality variations inside private homes, where plumbing materials and other factors may influence water chemistry. Conversely, private well water requires direct sampling and laboratory analysis to know the exact concentrations of 1,2,3-TCP at that location. Public system data can guide concerns but cannot diagnose private well conditions.
If your household experiences water issues that might or might not be related to 1,2,3-trichloropropane
Since 1,2,3-TCP is colorless and nearly odorless at typical concentrations, its presence does not typically cause obvious water aesthetic symptoms like taste or smell changes. Therefore, household signs such as staining, cloudiness, or unusual odors are unlikely indicators of 1,2,3-trichloropropane. To identify TCP, analytical testing of a water sample is necessary. Understanding your water quality report or consulting resources can help determine whether TCP is a concern or if other substances might be responsible for any noticeable changes.
If you are managing commercial or industrial water needs in addition to household concerns
Commercial and industrial water users may have additional regulatory and operational considerations related to 1,2,3-TCP, such as discharge limits and process water requirements. These users often require more comprehensive testing and tailored treatment solutions beyond household measures. While residential users focus on drinking water safety and taste, commercial operators must evaluate broader compliance and process impacts when addressing chlorinated solvents.
In summary, the EPA’s public water system record for the Bolling Water System in DC shows no detection of 1,2,3-trichloropropane above the reporting level of 0.03 micrograms per liter (parts per billion), and no health-based violations are on record. This data reflects system-wide monitoring and not specific household water quality, which can only be confirmed by testing your own water. For households seeking to address suspected 1,2,3-TCP presence, the Pentair 1,2,3-TCP Filter provides a technology option designed to target this chlorinated solvent effectively and ships ready to configure for home use. For detailed information about water quality data and monitoring methods, refer to the EPA’s Safe Drinking Water Information System (SDWIS) public water system records.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-05-19. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Bolling Water System - Jt. Base Anacostia-Bolling (DC0000007), DC: 4 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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