Lead exposure through drinking water can pose a serious health concern because lead is a toxic metal that can harm the body even at low levels of exposure. In homes and buildings with lead service lines, lead solder, older brass fixtures, or other lead-containing plumbing materials, corrosion can allow lead to enter the water supply. The water may still look, taste, and smell normal, making contamination difficult to identify without testing. Older residential buildings with historic plumbing therefore deserve closer attention, particularly when service line materials are unknown or the property was built before modern plumbing standards.
Once lead enters the body, it can affect several systems, including the nervous system, kidneys, blood, and cardiovascular system. In adults, prolonged exposure has been linked to high blood pressure, kidney damage, and other health problems. Children face particular risks because lead can interfere with brain development, growth, learning, behavior, and attention. The EPA warns that lead is harmful to health, especially for children, and that drinking water contamination often results from the corrosion of plumbing materials containing lead.
Another concern is that lead can accumulate in the body over time. Someone may experience no immediate symptoms, yet repeated exposure through drinking water, paint, dust, soil, or other sources can increase overall health risks. In older apartment buildings, brownstones, row houses, and multi-family properties, testing can help determine whether lead is present in water at the tap. Because plumbing conditions may differ between buildings and even between individual units in the same property, a building’s age alone cannot confirm whether its water contains lead. For residents who want to investigate potential contamination, lead water testing services in Manhattan can help assess drinking water and clarify whether further steps may be needed.
Children are especially vulnerable to lead contamination because their bodies are still developing and they can absorb lead more easily than adults. Their brains and nervous systems are also more sensitive to toxic exposure. Even low levels of lead in a child’s blood can affect learning, attention, and behavior. The CDC states that no safe blood lead level has been identified for young children and that all sources of lead exposure should be controlled.
This is why lead in drinking water is a major concern in homes with infants, toddlers, and young children. Children may drink tap water directly, consume formula mixed with tap water, or eat food prepared with water from household plumbing. If the building has lead service lines, lead solder, older fixtures, or unknown plumbing materials, drinking water may become one source of exposure. In older residential buildings, families may not know whether the pipe entering the basement, the service connection under the sidewalk, or interior plumbing branches contain lead-related materials unless the system is inspected or tested.
Pregnant women are also considered a higher-risk group because lead exposure during pregnancy can affect both the mother and the developing baby. Lead stored in the body can be released during pregnancy, and exposure may contribute to health risks for the fetus. Because of this, public health agencies recommend reducing lead exposure before and during pregnancy whenever possible. Homes with older plumbing, unknown service line materials, or a history of lead concerns may require extra caution, including water testing, use of certified filters, and guidance from local health or water authorities.
For families living in older apartment buildings, brownstones, and historic homes, the concern is not simply the age of the building but the uncertainty of the plumbing materials. A renovated kitchen or bathroom does not always mean the full plumbing pathway is lead-free. This is why households with young children or pregnant residents often take lead testing more seriously.
Public health agencies emphasize that no level of lead exposure is considered completely safe because research shows that even small amounts can cause harm, particularly in children. Lead serves no beneficial purpose in the body, and exposure can affect development, learning, and long-term health. The World Health Organization states that there is no known safe blood lead concentration, while the EPA and CDC likewise emphasize that no safe level of lead in a child’s blood has been identified.
This does not mean that every building with older plumbing automatically has high lead levels in its drinking water. Rather, it means exposure should be reduced as much as possible whenever a potential source is identified. In older cities, possible sources include lead service lines, lead solder, brass fixtures, outdated plumbing repairs, lead-based paint, contaminated dust, and soil. Drinking water is just one potential route of exposure, but it deserves particular attention when water passes through lead-containing plumbing materials before reaching the tap.
Because no safe level has been established for children, public health agencies prioritize prevention instead of waiting for symptoms to develop. Lead exposure can be difficult to recognize because affected individuals may not feel unwell immediately. Children with elevated exposure may initially show no obvious signs, making prevention and appropriate testing especially important. The CDC uses a blood lead reference value of 3.5 micrograms per deciliter to identify children whose levels are higher than those of most children. This value is not a safety threshold; it helps public health professionals identify children who may need follow-up.
For older urban housing, the practical steps are straightforward: when plumbing materials are unknown, residents can review service line records, inspect visible plumbing, and arrange drinking water testing. Depending on the findings, reducing exposure may involve using an appropriate certified filter, following local flushing guidance, replacing plumbing components, or replacing the entire lead service line when necessary. Residents seeking to investigate potential contamination can explore certified lead water testing in NYC as one option for assessing drinking water and deciding whether further action is needed.