Government Sampling Record for Missoula's Public Water System
The Mountain Water Company system in Missoula, Montana, provides groundwater-sourced water to approximately 68,200 residents across 28,046 connections. Federal monitoring from 2013 to 2015 detected no measurable 1,2,3-trichloropropane (1,2,3-TCP) in any of 44 samples, at or above the federal reporting level of 0.03 micrograms per liter. There is no health-based violation on record for this system. These data reflect system-wide performance and are not indicative of specific household plumbing or well conditions.
1. Judging Treatment Capacity Based on Household Daily Demand
When selecting equipment to address 1,2,3-TCP, consider the volume of water your household uses daily. Capacity should accommodate your peak consumption to maintain effective treatment without reducing flow or performance. The treatment system must be sized to your demand metrics, factoring in the number of residents and typical usage patterns such as showering, cooking, and cleaning. This ensures consistent reduction of any 1,2,3-TCP present and maintains water quality under normal residential use.
2. Adjustments for Large Households, Second Homes, or Seasonal Use
Households with more occupants or those operating multiple properties in Missoula may require systems with greater capacity or flexibility. Seasonal properties with intermittent use can face different water quality dynamics, including stagnation or system flushing effects, which influence treatment needs. Evaluating how water consumption varies seasonally or with multiple residences helps select adequately sized treatment solutions without oversizing unnecessarily.
3. Additional Considerations Commercial or Industrial Operators Do Not Need
Unlike commercial or industrial facilities, residential customers generally do not have to account for industrial process water volumes or regulatory compliance beyond residential standards. Commercial operations may require larger flow rates or specialized certification for compliance, which households can typically exclude from consideration. Residential focus stays on meeting daily household demand efficiently and maintaining water quality for family use.
4. Why Aesthetic Secondary Standards Differ From Health-Based Limits for 1,2,3-TCP
Federal guidelines include secondary standards based on aesthetic effects, such as taste and odor, which differ from health-based limits that address safety concerns. For 1,2,3-TCP, there currently is no federally established maximum contaminant level (MCL). Detected concentrations below reporting levels are not health concerns but may inform treatment preferences. Understanding that secondary standards relate to user experience rather than health risks clarifies why treatment equipment might be chosen for aesthetic improvement alongside contaminant reduction.
5. Interpreting the Measured Range Against Federal Standards
The absence of detectable 1,2,3-TCP in Mountain Water Company's system samples indicates levels are below the federal reporting threshold, not necessarily zero. This data does not predict individual household water content, which can vary based on internal plumbing and localized groundwater conditions. A detection above this level would still not constitute a violation unless a formal MCL existed and was exceeded. The measured range simply informs system-wide water quality status.
Closing Recommendation: Confirm Your Household's 1,2,3-TCP Level
The definitive step to determine the necessity and sizing of treatment equipment is to test your household water for 1,2,3-TCP using a certified laboratory capable of low-level quantification. A result below 0.03 micrograms per liter would affirm alignment with the system record, suggesting minimal treatment need for this constituent. If higher levels are found, selecting a treatment solution like the Pentair 1,2,3-TCP Filter, available for direct purchase and shipping ready to configure, can address your residential demand effectively. This targeted test resolves uncertainty and guides appropriate water treatment capacity choices.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-11-17. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Mountain Water Company (MT0000294), MT: 44 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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