The groundwater feeding taps in Middlesex County, Massachusetts, comes from aquifer 112LCSR. This underground water source is monitored through wells sampled by the U.S. Geological Survey to understand its water quality at the area level. These samples represent the aquifer’s general condition, not any individual household well.
Belief: Plumbing Materials and Age Increase Arsenic Levels in Water
It is often assumed that the metal pipes or plumbing age affect arsenic concentrations in tap water. While plumbing components can influence some contaminants or water quality aspects, arsenic originates primarily from natural geological sources in groundwater, not from plumbing materials. The U.S. Geological Survey samples focus on the aquifer water before it reaches any building plumbing, so their data reflect source water arsenic, independent of household pipe effects.
Belief: Treated Water Will Have Detectable Arsenic Similar to Untreated Source Water
When water is treated with the Pentair Arsenic Filter, the quality at the tap changes to reduce arsenic content below detectable or concerning levels. This system works by specifically targeting arsenic compounds in the water supply. Unlike untreated aquifer water, which the U.S. Geological Survey found to have arsenic detected consistently between 10.0 and 40.0 micrograms per liter across four samples, treated water will differ significantly. The filter's technology is designed to address these concentrations, improving water quality for household use.
Belief: Water Characteristics Remain Constant Regardless of Household Size or Use Pattern
Household water usage affects system demands and flow, but the arsenic concentration entering the home from aquifer 112LCSR remains consistent as shown by the September 2023 samples. Whether for a large family, a second home, or a seasonal property, the background arsenic levels in the source groundwater are stable within the sampled range. However, the filter system’s capacity to manage arsenic removal may require consideration relative to total water volume used, as greater demand could influence maintenance or cartridge replacement frequency.
Belief: Treatment Removes Arsenic Through Simple Filtration
The Pentair Arsenic Filter uses advanced filtration media specifically certified and designed to bind and remove arsenic compounds from water. Unlike generic filters, this system’s process targets arsenic ions and effectively reduces their presence. It does not merely filter particles but chemically adsorbs arsenic, preventing it from passing through to the tap. This distinction is important when choosing equipment to handle water with arsenic levels found in the Middlesex County aquifer.
Belief: Arsenic Levels in Groundwater Fluctuate Widely Over Short Periods
The four USGS samples taken from two wells in aquifer 112LCSR during late September 2023 show arsenic consistently detected between 10.0 and 40.0 micrograms per liter. This range and median (24.0 micrograms per liter) reflect the natural variability typical of groundwater sources. While some variation occurs, it is not abrupt or unpredictable over days. This information helps in assessing the consistent need for treatment rather than assuming sudden spikes or drops in arsenic presence.
What Middlesex County Area Data Does Not Show
This regional sampling does not provide specifics about any individual household well or tap water arsenic levels; only actual testing of your home’s water can reveal that. It also does not indicate any exceedance of federal arsenic standards or imply any immediate health risk. Municipal water suppliers in the area maintain records that show compliance with federal safety thresholds, reassuring users about regulated public water sources. Using a Pentair Arsenic Filter ships ready to configure and can help households address arsenic when local testing indicates a need.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2023-09-25. 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 Arsenic in the 112LCSR aquifer (Middlesex County): 4 results from 2 wells, median 24.0 ug/L, range 10.0-40.0 ug/L; none above any federal threshold