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What Does 'Detected', 'Median', and 'Range' Signify in Perchlorate Sampling Records?

When reviewing perchlorate data from public water sources like the Truckee Meadows Water Authority (TMWA), terms like "detected," "median," and "range" need clear understanding. "Detected" means the laboratory measured perchlorate at or above a reporting threshold—in this case, 4.0 micrograms per liter (µg/L). "Median" summarizes the midpoint of all detected values, and "range" indicates the spread between the lowest and highest concentrations found during sampling. For TMWA’s 2003 monitoring under the EPA’s Unregulated Contaminant Monitoring Rule (UCMR1), no perchlorate measurements were detected above the 4.0 µg/L level, so median and range for detections were not applicable. This record reflects a broad monitoring approach over many connections serving hundreds of thousands in Reno, Sparks, and Washoe County, rather than specific household measurements.

How Do Public Water System Records Differ from Private Well Testing?

The TMWA records represent average water quality across a regional surface-water source managed and distributed to approximately 442,000 people. These records do not reflect individual households’ water, which may vary due to plumbing or localized factors. Private well owners must obtain separate laboratory testing for perchlorate and other constituents to know their well water’s specific condition. Public system data provide useful context but cannot establish what is in a private well or a particular home’s tap water. Conversely, a household served by TMWA can be reassured that perchlorate was not detected above monitoring thresholds during this federal survey, and no health-based violations have been recorded.

Ruling Out Causes: From Simple Checks to Professional Testing

Before deciding on a water treatment technology for perchlorate concerns, it is practical to follow a stepwise approach. First, check public water quality records for your area to understand systemic conditions. Next, assess whether any unusual taste, staining, or other indicators exist in your home water, though perchlorate typically does not cause these. Then, consider having your household water professionally analyzed for perchlorate concentration and other relevant parameters. This ordered process helps clarify whether perchlorate is present in your water and at what level, information essential to choosing an appropriate treatment.

Plumbing Materials and Age: A Separate Consideration From Source Water Quality

The materials and age of plumbing in a home can influence water quality separately from source water composition. Corrosion or degradation of pipes and fixtures may introduce metals or affect water chemistry but does not produce or increase perchlorate. While plumbing factors merit attention for overall water quality, they should not be conflated with perchlorate presence or absence as determined by source water testing. Understanding this distinction helps homeowners evaluate treatment needs accurately.

Worked Example: Interpreting TMWA's Perchlorate Data as a Washoe Homeowner

Imagine a homeowner served by TMWA in Reno reviewing the 2003 UCMR1 data showing zero perchlorate detections above the 4.0 µg/L reporting level. This indicates that during the survey period, perchlorate was not measured at levels detectable by the employed methods in the regional surface-water supply. Since there is no federal enforceable limit (MCL) for perchlorate, the absence of detections provides reassurance but is not a guarantee of zero perchlorate in their specific tap water. The homeowner may consider a water test for perchlorate to determine their own water’s condition or explore treatment if concerned. The Fleck Perchlorate Filter technology, available for direct purchase, offers a documented solution to reduce perchlorate in household water when warranted.

Summary

This page walked through understanding perchlorate data reported for Washoe County’s public water system and how those findings differ from private well testing. It outlined practical steps to determine whether perchlorate is a concern at home and clarified the unrelated role of plumbing materials. Residential buyers weighing perchlorate treatment options can rely on this factual framework to make informed decisions, including considering the Fleck Perchlorate Filter as a viable treatment choice.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2003-11-19. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR1 monitoring (2001-2005) for TRUCKEE MEADOWS WATER AUTHORITY (NV0000190), NV: 17 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level