Our why

Every day, drinking water serves as one of the most direct connections between the environment and the human body. While municipal treatment systems are designed to meet regulatory standards, they are not built to remove every contaminant that can be present in source water. Certain chemicals can persist through treatment, travel through groundwater and distribution systems, and accumulate in the body over time.

Reverse osmosis plays an important role because it addresses exposure at the point of use. By reducing a broad range of dissolved contaminants before water is consumed, RO helps provide an added layer of protection and peace of mind for long-term health and everyday use.

Reverse osmosis: how it works

The RO process

Reverse osmosis (RO) is one of the most effective water purification methods available. It uses a semi-permeable membrane to remove a wide range of contaminants. Water is pushed through under pressure, allowing only water molecules to pass while trapping dissolved solids, heavy metals, industrial chemicals, pathogens, and other impurities. What reaches your glass is clean, safe, and better-tasting water.

Our machine: NSF certified for maximum safety and quality

Our RO system is tested and certified under seven NSF and ANSI standards (42, 44, 53, 55, 58, 61, and 62). Each certification addresses a specific area of water safety and performance, verifying effectiveness in improving taste and odor, controlling microbial risks, removing harmful contaminants, and ensuring that all components in contact with water are safe and non-leaching. Independent testing confirms long-term durability, structural reliability, and consistent purification.

NSF/ANSI 42: reduces chlorine, taste, and odor
NSF/ANSI 44: evaluates systems that reduce calcium and magnesium hardness
NSF/ANSI 53: removes harmful contaminants such as lead and volatile organic chemicals
NSF/ANSI 55: ensures effective ultraviolet microbial treatment
NSF/ANSI 58: verifies RO systems remove dissolved solids and a wide range of chemical and biological contaminants
NSF/ANSI 61: ensures safe construction materials that do not leach toxins
NSF/ANSI 62: verifies performance and safety in distillation systems

When you see the NSF mark, you can be confident that your system has been carefully tested for quality, safety, and reliable daily use.

PFAS: hidden dangers in our water

Drinking water can contain chemicals known as endocrine disruptors, which interfere with the hormones responsible for growth, development, and reproduction. These pollutants can enter water supplies through agricultural runoff, industrial discharge, wastewater, and plastic breakdown. Exposure has been associated with reduced fertility, developmental changes in children, and increased long-term health risks. Because standard municipal treatment is not designed to fully remove these substances, home filtration is becoming increasingly important.

A major group of endocrine disruptors is PFAS, often called "forever chemicals." PFAS are human-made compounds of fluorine bonded to carbon, giving them exceptional resistance to heat, stains, oils, and water, the same stability that makes them highly persistent in the environment and inside the human body. They are used in nonstick cookware, waterproof clothing, stain-resistant fabrics, food packaging, and firefighting foams. PFAS accumulate in groundwater, drinking water, wildlife, and human blood, and even low-level exposure over time has been linked to cancer, thyroid disorders, elevated cholesterol, reduced immune function, and harmful reproductive and developmental effects.

Arsenic in drinking water: a striking new study

Arsenic contamination remains a major health concern globally. A long-term Columbia University study in Bangladesh followed nearly 11,000 adults for about 20 years, repeatedly measuring arsenic exposure through urinary testing, with levels adjusted for hydration.

Through community efforts, many participants reduced their exposure, and those who did had a notably lower risk of death from chronic disease. Individuals whose exposure shifted from high to low experienced roughly a 50 percent reduction in mortality compared with those who stayed highly exposed. As exposure decreased, health outcomes improved. RO filtration is one of the only home systems that can reliably reduce arsenic, making it a powerful tool for preventing these risks.

Lead in drinking water: a hidden risk in older cities

Lead is a potent neurotoxin with no safe level of exposure, especially for infants and children, affecting brain development, learning, and behavior with impacts that can last a lifetime. In drinking water, lead typically does not come from the source water but from aging infrastructure: service lines, plumbing, and fixtures. This is a well-documented concern in older cities such as Washington, DC, where decades-old pipes increase the risk of lead leaching into tap water, particularly in homes built before modern plumbing standards.

Lead levels can vary significantly from one building to the next, even within the same neighborhood, and regulatory action levels are not health-based limits. Because lead often enters water after it leaves the treatment plant, point-of-use protection such as reverse osmosis can play an important role in reducing exposure at the tap.

Microplastics: an emerging everyday contaminant

Microplastics are tiny plastic particles from the breakdown of larger plastics or manufactured at microscopic sizes. They are now found throughout the environment (rivers, reservoirs, and treated drinking water) and have been detected in bottled water, tap water, and the human body. Because of their small size, many conventional treatment processes are not designed to fully remove them.

The long-term health implications are still being studied, but early research points to concerns around inflammation, oxidative stress, and the transport of other harmful chemicals that attach to plastic surfaces. Reverse osmosis can significantly reduce microplastics by physically rejecting particles that standard filtration may miss.

Healthy living: the benefits of reverse osmosis

RO provides wide-ranging protection. It removes microorganisms such as bacteria, viruses, and protozoa; reduces toxic metals including lead, mercury, and arsenic; and lowers nitrates, sulfates, PFAS, and many other contaminants that standard systems may miss. Cleaner water supports better overall health, protects appliances from scale buildup, reduces reliance on bottled water, and cuts plastic waste.

Made for the moment: why clean water access matters now

Clean water is becoming harder to maintain as contamination pressures rise. Climate change, industrial waste, and aging infrastructure all affect drinking water quality, and microplastics, PFAS, and chemical residues continue to show up in treated municipal systems. Home filtration offers an important final barrier between contamination and the water we drink.

A smarter, more sustainable choice

Reverse osmosis offers consistent purity, improved taste, and long-term value without the plastic waste of bottled water, a direct investment in both health and environmental sustainability. To see what is in your local supply, check your local water report by zip code, or explore the Sanavia Hydra RO system.

Our Why: The Science Behind Reverse Osmosis