Greensboro, North Carolina Water Quality Report

Quick answer: Greensboro's tap water comes from three protected reservoirs and meets federal health-based drinking water standards. Independent reviews of the city's testing data have, however, flagged several contaminants above stricter, non-enforceable health guidelines, mostly disinfection byproducts, along with chromium-6 and PFAS. That does not make the water unsafe to drink, but it is worth knowing what is in it and deciding for yourself.

Where does Greensboro's water come from?

Greensboro North Carolina tap water comes from Lake Higgins, Lake Brandt, and Lake Townsend

The City of Greensboro has three surface water sources: Lake Higgins, Lake Brandt, and Lake Townsend. The lakes sit in northern Guilford County, in the upper Cape Fear River Basin, inside a protected watershed. When full, the three reservoirs hold about eight billion gallons of water. Water from Lake Brandt is treated at the Mitchell Water Treatment Plant and water from Lake Townsend at the Townsend Water Treatment Plant; Lake Higgins is used to refill Lake Brandt as needed.

Per the city's water quality reporting, Greensboro's system served roughly 287,000 people with an average demand of about 33.4 million gallons per day, and the city has also purchased water from Burlington, Reidsville, the Piedmont Triad Regional Water Authority, and Winston-Salem to supplement supply.

Is Greensboro's water safe to drink?

By the legal definition, yes. Third-party review of Greensboro's tap water found it in compliance with federal health-based drinking water standards. The contaminants below were flagged because they exceeded health guidelines: stricter benchmarks set by independent scientists based on health research, not the enforceable legal limits. The gap between the two matters. A utility can be fully compliant while its water still contains contaminants at levels some researchers consider worth reducing.

It is also worth remembering that annual water quality reports only cover the contaminants utilities are required to test for. Water quality also varies by neighborhood and by the pipes in your own home, so the report is a starting point, not the final word.

Contaminants detected above health guidelines in Greensboro's water

Disinfection byproducts (TTHMs and haloacetic acids)

Most of the flagged contaminants in Greensboro's water are disinfection byproducts. They form when the chlorine used to keep water free of bacteria reacts with natural organic matter in the source water. This is a tradeoff every surface-water utility manages: disinfection is essential, and byproducts are the unwanted side effect.

The byproducts detected above health guidelines include the trihalomethanes bromodichloromethane, chloroform, and dibromochloromethane (grouped and regulated as total trihalomethanes, or TTHMs), the haloacetic acids dichloroacetic acid and trichloroacetic acid, and chlorate. In animal studies, long-term exposure to trihalomethanes and haloacetic acids at high doses has been linked to liver and kidney damage, and studies in the United States and Europe have associated elevated TTHM levels with increased cancer risk. The Department of Health and Human Services has determined chloroform may reasonably be anticipated to be a carcinogen. Chlorate exposure at high levels may affect thyroid function; the EPA notes long-term exposure to large amounts may lead to anemia, and there is currently no evidence it causes cancer in humans.

Chromium-6 (hexavalent chromium)

Chromium-6 was also detected above health guidelines. It can enter drinking water from industrial pollution or occur naturally in mineral deposits and groundwater. A 2008 National Toxicology Program study found chromium-6 in drinking water caused cancer in laboratory rats and mice, and scientists at California's Office of Environmental Health Hazard Assessment concluded it can cause cancer in people.

PFAS (perfluorinated chemicals)

Perfluorinated compounds, better known today as PFAS or "forever chemicals," were detected above health guidelines as well. These manufactured chemicals, used in products like nonstick coatings and water-repellent fabrics, are extremely persistent in the environment and dissolve readily in water. Animal studies link high exposure to endocrine, reproductive, and developmental effects. At the time of the original testing there were no enforceable federal limits for PFAS in drinking water, which is part of why the compliance-vs-guideline gap exists.

Radiological contaminants

Radiological contaminants, radioactive elements that leach into water from certain minerals and from mining, were flagged above health guidelines too. Long-term exposure to ionizing radiation is an established cancer risk, which is why these are monitored even at low levels.

Fluoride

Fluoride was detected in Greensboro's water but did not exceed the federal drinking water standard of 4 ppm. Like most large U.S. systems, Greensboro fluoridates its water for dental health. Some research has raised questions about high fluoride exposure and effects on the thyroid and developing brain, and the science is still being debated. If you prefer to remove fluoride from your drinking water, that is a personal choice a fluoride-rated filter can handle; if you want to keep it, plenty of filters leave it in.

How to read your own water quality report

Every community water system publishes an annual Consumer Confidence Report (CCR), and Greensboro's is available from the city's Water Resources department. These reports are dense, and only a handful of contaminants are required to appear in them, so unregulated contaminants often go unmentioned. We put together a plain-English walkthrough here: How to Read Your Water Quality Report (2026 CCR Guide).

Because water is local, the most accurate picture of what is coming out of your tap is a test of your own water through an accredited third-party laboratory, typically $150 to $400. In our opinion, cheap home test strips and TDS meters are not reliable ways to judge water quality.

What kind of filter removes these contaminants?

Most of the contaminants flagged in Greensboro's water, disinfection byproducts, chromium-6, and PFAS among them, can be substantially reduced by a quality activated carbon filter with enough contact time. That is why we build our filters around solid carbon block technology rather than the loose granular carbon used in most basic pitchers: a compressed block forces water through a much denser filtration path, which improves removal of stubborn contaminants like PFAS and lead. If you want the full comparison of carbon block vs. granular carbon, reverse osmosis, and whole-house systems, we cover it on our filter technology page.

The bottom line for Greensboro tap water

Greensboro's water is legally compliant, professionally treated, and drawn from a protected watershed. The honest concern is not an emergency, it is the everyday presence of disinfection byproducts, PFAS, and chromium-6 at levels above what independent health guidelines suggest. A good filter at the tap is the practical middle ground: you keep drinking tap water (still far cheaper and lower-waste than bottled) while cutting the contaminants the treatment plant cannot fully address.

If that is the route you want, our Pure XP pitcher is independently tested to reduce lead, PFAS, chlorine, and over 99.9% of microplastics, and the same filter comes in a larger Pure XP dispenser format for families. For filtered water away from home, there is our filtered water bottle, and you can browse everything in home filtration.

Sources

City of Greensboro, NC, Water Resources: annual Water Quality Report (Consumer Confidence Report)
U.S. EPA Enforcement and Compliance History Online (ECHO) database
National Toxicology Program (NIH): 2008 study of hexavalent chromium in drinking water
U.S. Department of Health and Human Services: chloroform carcinogenicity determination

This article is for educational purposes and is not medical advice.

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