Government sampling for the PHOENIX, CITY OF (AZ0407025) public water system, serving 1,695,000 people in Maricopa County, reported perchlorate detections in 2 out of 73 samples between 2002 and 2005, with levels reaching up to 5.2 micrograms per liter (µg/L), above a reporting level of 4.0 µg/L but below any federal enforceable limit.
Reading Certified Laboratory Perchlorate Test Results
Tests report perchlorate concentration in micrograms per liter (µg/L), indicating measured amounts of this constituent present.
Any detected perchlorate means the instrument measured it at or above the reporting threshold, not that the water is violating any safety or legal limit.
A single test result reflects only the water sampled and cannot characterize the entire household’s supply without further sampling.
Sample Size and Scope Behind Regional Perchlorate Figures
The 73 samples from the Phoenix public water system reflect testing of surface water sources supplying a large population, not private wells.
Only 2 detections were above the reporting level, indicating perchlorate presence in a small proportion of samples within monitored areas.
Limited sample size means these figures are a snapshot of the system at the time and do not predict continuous conditions or individual household water quality.
Differences Between Public Water System Records and Private Well Testing
Public system monitoring gathers source water data for many users, showing regional water quality trends rather than individual home water conditions.
Private well testing is required to confirm perchlorate concentrations specific to a household’s water supply and inform treatment needs.
Public system records show no federal maximum contaminant level (MCL) exceedances for perchlorate and indicate no EPA health-based violations related to perchlorate in Phoenix’s municipal water.
Consequences of Untreated Perchlorate in Household Water Over Time
Perchlorate can interfere with iodine uptake in the thyroid gland if present at elevated and sustained levels, potentially affecting thyroid function.
Long-term exposure risk depends on individual water perchlorate levels, which require testing to establish.
No immediate or obvious household signs clearly indicate perchlorate presence without testing, as perchlorate is colorless, odorless, and tasteless.
Household Water Symptoms Related to Perchlorate Presence
Typical home water quality issues such as staining, taste, or odor are not caused by perchlorate and therefore do not confirm its presence or absence.
Symptoms commonly linked to plumbing or other water constituents should be investigated separately from perchlorate concerns.
Testing specifically for perchlorate is necessary to identify if this constituent is present and at what level.
In summary, government data for Phoenix’s public water system show perchlorate detections at low levels in a small number of samples, with no federal health-based violations reported. Determining the perchlorate level in a specific household’s water depends on certified laboratory testing of that well or source. For households with confirmed perchlorate concerns, the Fleck Perchlorate Filter ships ready to configure and offers a documented approach to reduce perchlorate levels effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2002-11-07. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR1 monitoring (2001-2005) for PHOENIX, CITY OF (AZ0407025), AZ: 73 results across 1 listed contaminants, 2 detections above the reporting level; no federal MCL
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