If you notice metal fixtures or pipes in your home developing stains or corrosion, you might suspect corrosive water. In Ada County, ID, residents face water sourced from a deep aquifer system where natural pH levels influence water’s interaction with plumbing materials, but the severity can vary widely.
Myth: Treatment capacity should be guessed without evaluating your water use
Many believe a one-size-fits-all approach works for treating corrosive water. However, treatment capacity must be matched to your household’s daily water demand. This means measuring how much water your household typically uses per day—with typical household water use rates factoring in all bathroom, kitchen, laundry, and outdoor needs—to select an appropriately sized filtration system. Without this evaluation, a treatment system may be undersized or oversized, leading to ineffective corrosion control or unnecessary expense.
Myth: ‘Detected,’ ‘median,’ and ‘range’ data tell exactly how acidic your own water is
U.S. Geological Survey sampling of 44 wells in Ada County’s aquifer between 2010 and 2012 found the pH ranged from 6.4 to 8.7, with a median of 7.5 standard units. This pH range reflects the acidity or alkalinity across area wells but does not reveal your individual well’s water chemistry. “Detected” means measurements were made; it does not indicate a problem. The range shows variation, including some results slightly below the EPA’s recommended aesthetic secondary standard of 6.5, which relates to water corrosivity but is not a health-based limit.
Myth: Public water system records and private well tests provide the same water quality information
Public water system reports reflect treated water quality at consumer taps and are regularly monitored for regulatory compliance. Private wells, like those sampled in Ada County's aquifer, yield raw groundwater quality data before any treatment. This distinction means private well tests uncover natural geochemical characteristics such as pH variability, while public system data may show stabilized and blended water with generally different parameters. Your own well testing is essential to determine actual corrosivity at your supply point.
Myth: Regional data comparisons allow exact conclusions about local water conditions
Comparing Ada County’s aquifer pH range with neighboring counties can offer general insights into regional water chemistry trends but should not lead to assumptions about your well. Differences in geology, depth, and local factors affect water composition dramatically. Treat regional data as background context rather than definitive proof of your own water’s condition.
Myth: EPA secondary standards are health limits
The EPA’s pH secondary standard set between 6.5 and 8.5 standard units addresses aesthetic qualities such as taste, staining, and corrosion potential, not safety. Water just below 6.5 may be mildly corrosive, potentially accelerating pipe degradation or metal leaching, but it does not imply a health risk. Understanding this distinction helps prioritize treatment goals focused on preserving plumbing and water quality aesthetics.
Myth: Treatment systems only remove contaminants, not adjust water chemistry
The Autotrol Corrosive Water Damaging Pipes Filter addresses corrosivity by adjusting water chemistry to neutralize acidity and reduce corrosion risk. This system conditions water to lower its aggressiveness toward plumbing materials rather than simply filtering out solids or particles. Matching the system’s capacity to your household’s measured water demand ensures effective corrosion control tailored to your usage.
By assessing daily water use and understanding regional pH data limitations, Ada County residents can make informed choices about water treatment. The Autotrol system ships ready to configure and offers a documented solution for households seeking to manage corrosive water effects effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2012-08-22. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of pH in the aquifer (Ada County): 89 results from 44 wells, median 7.5 standard units, range 6.4-8.7 standard units; EPA secondary standard for pH is 6.5-8.5 (aesthetic/corrosivity, not health-based); 3 of 89 sampled results fell below 6.5
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