Overview of Bismarck's Water Supply System and 1,2,3-TCP Context
Bismarck, serving over 72,000 people in Burleigh County through surface water sources, provides municipal water monitored under EPA regulations. The system’s water quality records show no health-based violations, including for 1,2,3-trichloropropane (TCP), a chlorinated solvent of concern in many agricultural regions.
Granular Activated Carbon Contact Time: Why Bed Depth Matters for TCP
For contaminants like 1,2,3-TCP, the effectiveness of granular activated carbon (GAC) depends notably on the contact time—the duration water remains in the carbon bed. Unlike substances affecting taste or odor, TCP requires longer interaction with the carbon medium to adsorb effectively. Bed depth directly influences this contact time, meaning that a deeper carbon bed can enhance the treatment of chlorinated solvents such as TCP more than it does for taste-related issues.
Legacy of Soil Fumigant Use and TCP's Journey to Groundwater
1,2,3-TCP was historically used as an impurity in soil fumigants predominantly from the 1950s through the 1980s. Over time, this chlorinated solvent migrated through soil layers, eventually reaching deep groundwater and surface water reserves. This delayed migration explains detections in water sources decades after direct application ceased, highlighting the persistence and mobility of TCP in the environment.
Sampling Scope and Interpretation for Bismarck's Water Record
The EPA's Unregulated Contaminant Monitoring Rule (UCMR3) sampled the City of Bismarck’s community water system multiple times between 2013 and 2015. Four sampling events specifically monitored for 1,2,3-TCP, with no detections reported above the 0.03 micrograms per liter (µg/L) reporting level. These results reflect system-wide sampling and do not represent conditions at individual homes or private wells.
What the Measured Range Indicates and What It Does Not
The absence of detection above the reporting threshold in official samples does not guarantee zero presence at all times or locations but indicates that TCP levels in the system remain below the limit at which reliable measurement occurs. Federal health-based limits for TCP do not exist, making the data points measurements, not violations or safety assessments.
Applying Public Data to Your Household Water Concerns
If you have experienced treatment equipment failure, understanding the system's sampling record offers a starting point but cannot substitute for individual water testing. For example, if Bismarck’s system recorded zero detection above 0.03 µg/L, your home's water could have different levels due to plumbing, point-of-entry changes, or private well influence. Testing your own water for TCP concentration is necessary to determine if chlorinated solvent treatment is required.
Agricultural Land Use and Its Relation to TCP Detections in Burleigh County
Burleigh County has a history of agricultural activity associated with soil fumigant applications. This historic land use corresponds to the occasional detection of chlorinated solvents such as TCP in water sources, generally at low or non-detectable levels within Bismarck's public supply. The overlay of agricultural patterns helps explain potential contaminant presence but does not predict individual household water quality.
Recommended Next Step: Confirming Your Water's TCP Status
If your residential water treatment equipment has failed, the most definitive step is to order a laboratory analysis of your water specifically for 1,2,3-trichloropropane. A quantification below 0.03 µg/L would align with public system sampling results, while higher readings would indicate the need for targeted mitigation.
For treatment, the Pentair 1,2,3-TCP Filter ships ready to configure for household use. It employs proven methods to address chlorinated solvents effectively, providing a pathway to restore water quality after equipment failure.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-02-11. 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 Bismarck (ND0800080), ND: 4 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level