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Arsenic in Water Solutions


Arsenic in water affects approximately 20 percent of private wells in Massachusetts with unhealthy levels of this contaminant naturally occurring..  Well inspection and testing well water is the best way to make sure that your water is clean and safe to drink, but well owners often don’t have the right kinds of tests done or do not use accredited laboratories.

Arsenic in water may occur naturally and is a tasteless, odorless and colorless contaminant.  Some activities that could also have left residuals include apple orchard spraying, coal ash disposal, and use of some pressure treated wood.  While there are serious health threats associated with ingestion, there are effective methods for removial.  For detail on potential health affects, see the link at: AS facts.

remove arsenic from drinking water Rehoboth, MA   The two primary forms of Arsenic in well water are AS III and AS V.  Many removal media have a low capacity for removing AS III from the water, therefore, converting it to AS V for removal is a common approach. Therefore, determining the ratio of AS III versus AS V in the water is critical. This will allow the design and implementation of a water treatment system that will effectively remove it from your drinking water. There are methods to oxidize the AS III and convert it to AS V for ease of removal.

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Twin Arsenic system with Ozone


Arsenic in drinking water removal Rehoboth, MA

Having a complete laboratory water test and analysis, including parameters that can negatively impact arsenic removal media, is critical to a well designed, safe water treatment system that will remove arsenic in well water.  pH can significantly affect Arsenic media performance along with other competing ions such as Iron, Manganese, Hardness, Vanadium, Sulfate, Phosphate, Silica, Total Dissolved Solids, Suspended Solids and Hydrogen Sulfide.  For a full article on this topic which we’ve had published in Water Technology Magazine, go to our publications section and click on our published Arsenic removal article at https://h2ocare.com/publications/.


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Determining water usage is also critical to designing an effective arsenic in water removal system that will have the proper capacity.  Key information would include well pump size, well pump flow rate, size of the incoming water line, number of residents in the home, the number of bathrooms, space availability for equipment installation, electrical availability and water discharge location or restrictions, among others.


A couple of key components for consideration when designing this type of system include:

  1.  Utilizing a meter to track flow rate and total gallons processed is critical to determine the home’s water demand.
  2.  Gallons used readings also assist in uncovering any potential leaks in the home such as running toilets, which will unnecessarily prematurely deplete the arsenic media’s capacity.


Because Arsenic in well water is a tasteless, colorless and odorless contaminant, it is particularly important to have two tanks in series in case the first tank is depleted  prior to scheduled service with your water treatment company.  Service should be scheduled at intervals determined by the water use tracking data accumulated. This combined with appropriate water testing intervals are added safeguards to prevent Arsenic from getting into the treated water entering the home.

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H2O Care is an established Massachusetts based water testing & filtration company formed in 1989 with offices in Middleton, Stow & Lakeville, MA with a service depot in Plymouth.  The company has been published multiple times in Water Technology magazines – see www.h2ocare.com/pub. Contact us at [email protected] or call 800-539-1100.