What Commercial or Industrial Operators Question Beyond Household Concerns
Commercial or industrial water users often require more detailed radon data than residential households. They may assess radon not only in water but also in air emissions, workplace safety exposure, and compliance with occupational standards. Their questions include treatment capacity for high-volume water use and integration with other water quality controls. Households, however, primarily focus on radon levels affecting water consumption and indoor air quality through water use.
How Radon Enters Groundwater in Monterey County Aquifers
Radon-222 is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. In Monterey County, radon can dissolve into groundwater as it moves through underground rock formations. This process depends on local geology and the depth and type of the aquifer. Since radon is a gas, it can enter water supplies from the surrounding environment rather than from surface contamination.
Interpreting Measured Radon Ranges Against Federal Standards
U.S. Geological Survey sampling of 55 wells in Monterey County aquifers from late 2012 to early 2013 found radon present in all tested wells. Concentrations ranged from 158.0 to 2300.0 picocuries per liter, with a median of 490.0 pCi/L. Although detectable in all samples, none exceeded the federal radon threshold for water, which means no sample in this dataset was above any legal limit. This indicates radon presence is common but does not alone confirm a health risk for any specific well or residence. Actual radon levels in your water require individual testing.
How Treated Water Differs at the Tap with the C-Series Radon in Water Filter
The C-Series Radon in Water Filter system targets radon reduction by removing it from water before it reaches your household taps. After treatment, water will have significantly lowered radon concentrations, reducing the potential for radon gas to escape into indoor air during water use activities like showering or cooking. This treatment helps address concerns about radon exposure from water, providing peace of mind when you receive water from your own well or supply.
Influence of Sample Depth, Well Depth, and Source Type on Expected Radon Levels
Monterey County wells sampled varied from 24 to 700 feet deep, and radon concentrations showed a wide range across this depth span. Deeper wells may intersect strata with different radon production or retention characteristics compared to shallower wells. The type of source—whether private well or public supply—also affects radon levels since different sources draw from varied aquifers or zones. Understanding your well’s depth and geological origin can guide expectations but does not replace direct water testing.
Seasonal and Multi-Year Variations in Radon Measurements
The USGS dataset covers about six months between late 2012 and early 2013. While radon levels were consistently detected across this period, the dataset does not provide multi-year or seasonal trend analysis. Radon concentrations in groundwater can fluctuate with changes in groundwater flow, temperature, and geological activity, but the available data limits conclusions about long-term variation in Monterey County. Continuous monitoring would be required for a comprehensive view.
What You Should NOT Conclude from Area Radon Data Alone
Area-wide measurements of radon in Monterey County aquifers reveal that radon exists in local groundwater but cannot specify the radon level in your home’s water. Detection does not equal violation, hazard, or health risk without individual testing. Additionally, no well in the sampled area was found to exceed federal radon thresholds, so presence alone is not a cause for alarm. To know your water’s safety with respect to radon, a specific water test is necessary. When radon is detected, treatment like the C-Series Radon in Water Filter can reduce radon exposure from water sources.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-04-25. 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 Radon-222 in the aquifer (Monterey County): 55 results from 50 wells, median 490.0 pCi/L, range 158.0-2300.0 pCi/L; none above any federal threshold