The U.S. Geological Survey (USGS) sampled groundwater in Salt Lake County from wells tapping the 100VLFL aquifer and recorded pH levels to understand water acidity in this region. This data provides a helpful overview of the typical range and central tendencies of water acidity but does not directly measure your home's water.
1. What 'detected', 'median', and 'range' Mean in the Sampling Record on This Page
The USGS results show that all 246 pH readings from 59 wells detected a pH value, giving a consistent dataset. The median pH—the middle value in all recorded samples—is 7.45 standard units, indicating generally neutral to slightly basic water in this aquifer. The range spans from 6.7 to 9.7, showing variability between samples but no measurements below 6.5.
2. What a Certified Laboratory Test for pH Reports and How to Read It
A certified lab test for your home's water pH will yield a precise standard unit measurement, reflecting the acidity or alkalinity of that water specifically. This test is essential for understanding how your water compares to the broader regional values. Since pH measures a logarithmic scale of hydrogen ion activity, values below 7 indicate acidic water, exactly how acidic or neutral your water is requires this direct testing.
3. What the Measured Range Means Against the Relevant Federal Standard, and What It Does Not Mean
The EPA’s secondary standard for pH is 6.5 to 8.5—this is an aesthetic guideline relating to pipe corrosion and taste rather than health safety. The USGS’s Salt Lake County samples all meet or exceed 6.5, suggesting that acidic water (pH below 6.5) is not typical in the sampled wells. However, this broad regional data does not guarantee your household water is within this range, as local conditions vary.
4. How to Judge Treatment Capacity Against the Household's Daily Demand
If a test reveals your water is below the aesthetic pH standard and you wish to mitigate acidity-related issues, consider treatment that is sized for your household's daily water use. The Pentair Acidic / Low-pH Water Filter ships ready to configure and is designed to adjust low-pH water to more neutral levels. Ensuring the system meets your home's flow rates and consumption patterns is vital for effective water quality management.
5. How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The USGS dataset comes from 59 wells with 246 total pH measurements over more than a decade, covering depths from 23 to 1,385 feet. This substantial sample size helps define broad regional water conditions but cannot account for localized variations in private wells or taps. Smaller sample sets from a single well provide the most accurate picture of your water quality.
To understand if your home water is acidic, conduct a certified lab pH test directly on your supply. Regional USGS data indicates Salt Lake County's groundwater in aquifer 100VLFL generally does not fall below the EPA aesthetic pH range. If adjustment is needed, the Pentair Acidic / Low-pH Water Filter offers a documented solution sized for residential use and ships ready to configure for your household's needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2021-12-08. 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 100VLFL aquifer (Salt Lake County): 246 results from 59 wells, median 7.45 standard units, range 6.7-9.7 standard units; EPA secondary standard for pH is 6.5-8.5 (aesthetic/corrosivity, not health-based); 0 of 246 sampled results fell below 6.5
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