Arsenic in Well Water: Understanding, Testing, and Treatment
September 25, 2026
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by
Raul Grimaldo
Lead in drinking water often comes from lead service lines, older plumbing, solder, faucets, or fixtures rather than the original water source itself. Because lead cannot be reliably seen, tasted, or smelled, testing is the best way to determine whether it is present. If lead is detected, certified filtration can help reduce exposure while replacement of lead-containing plumbing may address the underlying source.
Lead in drinking water deserves attention because exposure can affect health even when the water looks, smells, and tastes completely normal. In many homes, the issue begins after treated water leaves the municipal system and travels through service lines, pipes, solder, faucets, or fixtures that contain lead.
Older homes and communities may face greater risk, particularly where lead service lines or older plumbing materials are still present. However, the age of a home alone cannot confirm whether lead is in the water. Testing and identifying plumbing materials provide much more useful information.
The good news is that homeowners can take practical steps to reduce exposure. Understanding where lead comes from, testing correctly, using certified filtration when needed, and addressing lead-containing plumbing can all play a role in protecting household drinking water.
Lead in drinking water most commonly enters the water when plumbing materials containing lead corrode.
Lead service lines are one of the most significant potential sources. These pipes connect a property to the water main and were historically installed in many communities. Lead can also come from older solder, brass or chrome-plated brass faucets, fixtures, and other plumbing components.
The amount of lead that enters the water can depend on several factors, including water chemistry, temperature, how long water remains in contact with plumbing, and the condition of the pipes and fixtures.
Homes built before 1986 are more likely to contain certain lead-bearing plumbing materials, but construction date alone does not provide a complete answer. Some properties may have had plumbing replaced, while others may still have lead service lines even if portions of the home’s interior plumbing are newer.
Contacting your water utility and inspecting your service line materials can help clarify whether lead-containing plumbing may be present.
No. Lead dissolved in drinking water generally cannot be identified by appearance, taste, or smell.
This makes lead different from many common water problems. Iron may leave orange staining. Sulfur can produce a rotten-egg odor. Hard water often leaves white scale. Lead may provide no visible warning at all.
A glass of clear, fresh-tasting water therefore does not prove that lead is absent. If your home has an older service line, older plumbing materials, or another reason for concern, water testing is the appropriate next step.
Lead exposure can affect multiple body systems, and children are particularly vulnerable because their bodies and nervous systems are still developing.
Health authorities agree that there is no known safe level of lead in a child’s blood. Lead exposure in children has been associated with effects on learning, attention, behavior, development, and IQ.
Pregnancy is another period of concern because lead can cross the placental barrier and may affect fetal development. Adults can also experience health effects from lead exposure, including impacts on the cardiovascular system, kidneys, and other organs.
Drinking water is only one potential source of lead. Older paint, household dust, contaminated soil, and certain products can also contribute to exposure. If you are concerned about a child’s lead exposure, water testing may be only one part of the broader conversation with a healthcare professional.
The most reliable way to determine whether lead is present in drinking water is to have an appropriately collected water sample analyzed by a qualified laboratory.
Sampling procedures matter because lead levels can change depending on how long water has been sitting in the plumbing and which faucet is tested. Follow the instructions provided by the laboratory, water utility, or local drinking water authority carefully.
Your public water provider can also be a valuable resource. Utilities may have information about the service line serving your property, local lead monitoring, replacement programs, or testing assistance.
If you use a private well, remember that lead may still come from household plumbing even when the groundwater itself is not the source. Testing at the tap can help identify whether lead is reaching your drinking water somewhere within the system.
If lead is detected, focus on reducing exposure immediately while determining where the lead is coming from.
Several actions may help depending on your plumbing and test results:
Reverse osmosis can reduce lead when the system has been properly designed, maintained, and certified for that purpose.
RO systems typically treat drinking water at the point of use, such as beneath the kitchen sink. Water moves through several treatment stages, including a semipermeable membrane that can reduce many dissolved substances.
This makes reverse osmosis a potential option when lead is detected in drinking water, particularly when the household also wants treatment for other contaminants the selected system is certified to reduce.
However, homeowners should not assume that every product labeled “reverse osmosis” offers identical performance. Look for independent certification that specifically includes lead reduction, follow the installation requirements, and replace filters and membranes according to the manufacturer’s instructions.
Some activated carbon filtration systems can reduce lead, but only filters specifically designed and certified for lead reduction should be relied upon for that purpose.
Activated carbon is commonly associated with reducing chlorine taste and odor and certain organic contaminants. Lead reduction requires the filter to meet specific performance criteria, so a standard carbon cartridge should not automatically be treated as a lead filter.
When shopping for a point-of-use system, check the certification and contaminant reduction claims carefully. Independent certification helps demonstrate that the product has been evaluated against recognized performance standards.
Filter replacement is equally important. Once a cartridge reaches the end of its rated life, its ability to reduce contaminants can decline. A certified filter only works as intended when it is installed, used, and maintained properly.
A standard water softener should not be considered a primary treatment method for lead in drinking water.
Traditional ion exchange water softeners are designed mainly to remove hardness minerals such as calcium and magnesium. They help reduce scale buildup and improve the performance of soaps, plumbing, and water-using appliances.
Those benefits are valuable when hard water is present, but hardness treatment and lead reduction are different goals. A home can need both a softener and a drinking water filtration system if testing identifies multiple concerns.
This is why water treatment should be based on a complete understanding of the home’s water rather than choosing one piece of equipment and expecting it to solve every problem.
Replacing a lead service line can address a major source of lead, while filtration is often used to reduce exposure at the tap.
A certified drinking water filter can be an important protective measure, especially while homeowners investigate or wait for plumbing replacement. However, filtration does not physically remove a lead service line from the property.
If your home has a lead service line, contact your water provider to learn who owns different portions of the line and whether replacement programs, financial assistance, or local requirements apply.
Other potential sources, such as older fixtures or solder, may also need attention. Addressing the source and using appropriate filtration when needed provides a more complete strategy than relying solely on one approach.
Homeowners can reduce potential lead exposure by combining good water-use practices, testing, certified filtration, and plumbing improvements where needed.
The most appropriate steps depend on where the lead originates and how much is detected. Testing helps prevent homeowners from treating the wrong problem or purchasing equipment that is not designed for the contaminant involved.
Lead concerns can vary significantly between communities and properties because drinking water infrastructure is not the same everywhere.
Older cities may have a greater number of lead service lines, while individual homes can contain different combinations of pipes, fixtures, solder, and replacement materials. Water chemistry also influences corrosion and can affect how lead-containing plumbing interacts with water.
Municipal water systems use corrosion-control strategies to reduce the amount of lead that can leach from plumbing, but homeowners should still understand the materials serving their individual property.
Shark Filtration can help homeowners evaluate their broader water quality concerns and determine whether targeted drinking water filtration should be part of their treatment plan. When lead is the specific concern, testing and certified contaminant-reduction performance should guide the recommendation.
Lead in drinking water can be difficult to recognize because there may be no visible, noticeable warning that it is present. The most effective response begins with information: understand your plumbing, talk with your water provider, and test when lead is a concern.
If testing identifies lead, certified filtration can help reduce exposure at the tap. Reverse osmosis and certain certified point-of-use filters may be appropriate depending on the home’s water quality and treatment needs. At the same time, identifying and replacing lead-containing service lines, fixtures, or plumbing can address the underlying source.
There is no need to guess which system your home needs. Shark Filtration can help homeowners evaluate their water conditions and choose treatment based on actual results, certification, household needs, and long-term maintenance.
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