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Greensboro NC Water Quality: Haw River Contamination, 1,4-Dioxane, and Industrial Legacy

March 23, 2026
Greensboro North Carolina downtown and the Haw River watershed

Greensboro is the third-largest city in North Carolina, anchoring the Piedmont Triad alongside Winston-Salem and High Point. The city’s 300,000 residents get their drinking water from a system of reservoirs — Lake Townsend, Lake Brandt, Lake Higgins, and the Mitchell Water Treatment Plant drawing from Lake Mackintosh on the Haw River.

The reservoirs capture surface water from the Haw River watershed, and that’s where the complications begin. The Haw River has a long history of receiving treated wastewater discharges and industrial runoff, and contaminants that enter the watershed eventually make their way into Greensboro’s drinking water supply.

1,4-Dioxane: An Emerging Concern

1,4-Dioxane has become one of the most closely watched contaminants in North Carolina’s water supply. It’s a synthetic chemical used as a solvent stabilizer in various industrial processes — and it’s a likely carcinogen, according to the EPA.

The Haw River and its tributaries have shown detectable levels of 1,4-dioxane, primarily from upstream industrial discharges and wastewater treatment plants. The chemical is notable for several reasons:

Greensboro’s water system has detected 1,4-dioxane at levels above North Carolina’s health goal but below the EPA’s advisory level. The city has invested in advanced treatment — including advanced oxidation processes — to reduce 1,4-dioxane concentrations in finished water.

The Textile Industry Legacy

North Carolina’s Piedmont region was the center of America’s textile industry for over a century. Mills in Greensboro, Burlington, High Point, and surrounding communities processed cotton, wool, and synthetic fabrics using a wide range of chemicals — dyes, solvents, finishing agents, and fire retardants.

Most of those mills are gone now, but their chemical legacy persists in the watershed:

Several former textile sites in and around Greensboro are listed as contaminated sites under North Carolina’s Inactive Hazardous Sites program. Groundwater contamination plumes at these sites continue to require monitoring and, in some cases, active remediation.

PFAS in the Haw River Watershed

Following the GenX contamination crisis in the Cape Fear River basin (centered around Fayetteville and Wilmington), North Carolina expanded PFAS monitoring across the state’s major river systems. The Haw River watershed, while not as severely affected as the Cape Fear, has shown detectable PFAS levels.

Sources in the Greensboro area include:

North Carolina has been more aggressive than most states in testing for PFAS following the GenX crisis. The state’s Department of Environmental Quality has conducted extensive sampling of drinking water sources, including Greensboro’s reservoirs.

Reservoir Management Challenges

Greensboro’s reservoir system faces typical challenges for surface water supplies in the southeastern Piedmont:

Nutrient loading: Phosphorus and nitrogen from agricultural runoff, septic systems, and urban stormwater promote algal growth in the reservoirs. During warm months, algal blooms can produce taste and odor compounds (geosmin and 2-methylisoborneol) that, while not harmful, affect water taste.

Sedimentation: Soil erosion from construction, agriculture, and stormwater contributes sediment to the reservoirs, gradually reducing their storage capacity. Lake Townsend and Lake Brandt have experienced sediment accumulation over their decades of operation.

Disinfection byproducts: The organic material in surface water reacts with chlorine or chloramine during treatment, producing trihalomethanes and haloacetic acids. Greensboro manages DBPs through a combination of treatment optimization and distribution system management, maintaining compliance with EPA’s Stage 2 DBP Rule.

Lead in Older Homes

Greensboro, like many cities with housing stock from the pre-1986 era, has lead exposure risks from residential plumbing. North Carolina’s Lead and Copper Rule sampling shows Greensboro’s water system in compliance with the 15 ppb action level, but:

The GenX Ripple Effect

While Greensboro wasn’t directly affected by the Chemours GenX discharge that contaminated the Cape Fear River, the crisis had significant ripple effects across the state:

Greensboro residents, already primed by local 1,4-dioxane concerns, have been among the most active in demanding water quality transparency from their utility.

What Greensboro Residents Should Know

  1. Greensboro’s treated water meets all federal standards, but some contaminants of concern (1,4-dioxane, PFAS) are either unregulated or regulated at levels that some health experts consider insufficient.
  2. Check your home’s plumbing age. If your home was built before 1986, you may have lead solder in your plumbing. Running the tap for 30 seconds before drinking after periods of non-use reduces exposure.
  3. Activated carbon and reverse osmosis are the most effective residential treatment options for the mix of contaminants in Greensboro’s source water. Activated carbon handles 1,4-dioxane, PFAS, DBPs, and taste/odor issues. RO adds nitrate and lead removal.
  4. Stay engaged. Greensboro’s Water Resources Department publishes annual water quality reports and holds public meetings on water system issues.

If you’re concerned about your water quality, a certified water treatment professional can test your water and advise on the right system. In a region with both legacy industrial contamination and emerging chemical concerns, proactive filtration is a reasonable investment.

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