When most people think about water quality, they think about the basics: bacteria, lead, chlorine. But the list of compounds that can end up in drinking water is far longer — and the science of detection keeps improving, revealing contaminants that were previously undetectable at low concentrations. For homeowners in the Raleigh area and across North Carolina, understanding emerging contaminants is part of making truly informed decisions about your water.
What Are Emerging Contaminants?
Emerging contaminants are substances that have been detected in water supplies and may pose risks to human health or the environment, but for which regulatory standards may not yet be finalized or fully established. They include compounds that are truly new, as well as substances that have existed for decades but are only now being detected as testing technology improves.
Emerging Contaminants of Concern in North Carolina
PFAS (Per- and Polyfluoroalkyl Substances)
PFAS are the most prominent emerging contaminant concern in North Carolina, given the state's history with industrial releases and their presence in water supplies statewide. The EPA finalized MCLs for several PFAS compounds in 2024, moving them from \"emerging\" to formally regulated — but thousands of other PFAS compounds remain without established limits.
Microplastics
Microplastics — tiny plastic fragments and fibers — have been detected in drinking water supplies worldwide, including in the United States. Research into the health effects of ingested microplastics is ongoing. No regulatory standards exist yet, and conventional water treatment does not specifically target microplastic removal. Reverse osmosis systems are among the more effective barriers against microplastics at the point of use.
1,4-Dioxane
1,4-Dioxane is an industrial solvent that has been detected in surface water supplies in North Carolina, partly linked to industrial discharge. It's resistant to many conventional water treatment methods and has been detected at low levels in some NC water supplies.
Pharmaceutical and Personal Care Products
Trace amounts of pharmaceuticals — including hormones, antibiotics, and other medications — and personal care product chemicals have been detected in surface water and, at very low levels, in some finished drinking water. The health implications of long-term low-dose exposure are not yet fully understood.
What This Means for Raleigh-Area Homeowners
Standard water quality reports cover regulated contaminants. They don't tell you about compounds for which no regulation yet exists. This doesn't mean your water is necessarily unsafe — it means there's uncertainty, and that some homeowners reasonably choose to take precautionary steps.
The most practical approach for homeowners concerned about emerging contaminants is a layered treatment strategy:
- Whole-home activated carbon filtration addresses a broad range of
organic compounds
- Reverse osmosis at the kitchen tap provides the most comprehensive
reduction of dissolved contaminants for drinking water
- UV disinfection at the point of entry adds pathogen protection
without chemicals
Staying Informed
Reviewing your utility's annual water quality report is a good starting point. For private well users, periodic testing by a certified laboratory — including panels for emerging compounds as they become available — is the responsible approach.