Meghan Hodges
The Occoquan River in Northern Virginia is a tributary of the Potomac River and is used for drinking water, fishing, boating, and rowing. It is also bordered by three parks. The river has a history of water pollution, with recent tests indicating the presence of toxic forever chemicals like PFAS, which are linked to health issues such as cancer. These contaminants are believed to originate from a former US Army base, Vint Hill, where firefighting foam containing PFAS chemicals leached into the soil and groundwater. While the Occoquan River provides drinking water for thousands of residents, efforts are underway to identify and mitigate the sources of pollution to ensure safe water supply and protect the health of the community.
| Characteristics | Values |
|---|---|
| River length | 24.7 miles (39.8 km) |
| Watershed area | 590 square miles (1,528 km2) |
| Pollution sources | PFAS chemicals, sewage discharge, and stormwater runoff |
| Pollutant levels | PFAS above the EPA's proposed limit of 4 parts per trillion |
| Drinking water source | Yes for 800,000 residents in eastern Prince William and Fairfax counties |
| Dams | Three along its length |
| Reservoirs | Two created by dams |
| Parks | Bordered by Bull Run, Occoquan, and Fountainhead parks |
| Sports | Rowing and horse riding |
Explore related products
What You'll Learn
PFAS contamination from the former US Army base at Vint Hill
The Occoquan River in Virginia has been found to be contaminated with PFAS (per- and polyfluoroalkyl substances), with tests showing levels of PFAS in the river above the EPA's proposed limit of 4 parts per trillion. PFAS contamination has also been detected in the nearby South Run and Broad Run waterways, which are connected to tributaries that flow from Vint Hill to the Occoquan Reservoir, a drinking water source for 800,000 people in Northern Virginia.
Vint Hill, a former U.S. Army base located at the border of Fauquier and Prince William counties, is a suspected source of PFAS contamination in the Occoquan watershed. The U.S. Department of Defense (DoD) has reported finding PFAS in drinking water and groundwater at Vint Hill, with levels hundreds of thousands of times higher than the EPA health advisory. The contamination is believed to be tied to the use of firefighting foam containing PFAS chemicals during training exercises at the base from the early 1970s until the installation closed in 1997. Groundwater samples have confirmed that PFAS is still present in the environment, with PFOS and PFOA levels detected at 300 times the EPA advisory limits.
The Army has been criticized for its secrecy and lack of transparency regarding PFAS contamination at Vint Hill. They are required to publish reports detailing the existence of PFAS and analytical results, but they have refused to do so. The Army Corps of Engineers has assured the community that the levels of PFAS detected in the water supply are not a cause for concern. However, the Army's response has been consistent across the country and worldwide, leaving the press and local communities uncertain about the health impact of PFAS contamination.
Testing and investigations are underway to determine the extent and sources of PFAS contamination in the Occoquan watershed, including potential release areas, surface water, groundwater, sediment, and soil. The Occoquan Watershed Monitoring Laboratory has begun testing samples from throughout the watershed to pinpoint the sources of PFAS. The new testing will help provide the scientific foundation necessary to support efforts to reduce or eliminate PFAS sources within the watershed and ensure safe drinking water for the communities that rely on it.
Legal firms such as Stephens & Stephens, LLP, are also investigating cases of PFAS exposure at current and former military installations, including Vint Hill. They are offering free case evaluations and seeking compensation for individuals who have suffered from PFAS-related illnesses after living at or near contaminated sites. The presence of PFAS in the Occoquan River and the potential impact on the health of surrounding communities remains a significant concern, and ongoing efforts are focused on understanding and mitigating the contamination.
Hawaii's Night Sky: Illuminating Light Pollution
You may want to see also
Explore related products
PFAS compounds in Fauquier and Prince William counties' waterways
PFAS, or per- and polyfluoroalkyl substances, are manmade chemicals that are now found worldwide in around 45% of public drinking water systems. These toxic "forever chemicals" do not break down under normal environmental conditions and can remain in the soil and human body indefinitely. They are associated with cancer and a host of other health issues.
PFAS compounds have been discovered in several waterways in Fauquier and Prince William counties, according to the United States Geological Survey. South Run, Broad Run, and the Occoquan Reservoir have all tested positive for PFAS. The smaller waterways of South Run and Broad Run flow into tributaries that lead to the Occoquan Reservoir from Vint Hill, a former U.S. Army base. The Department of Defense has been monitoring PFAS contamination at Vint Hill, which is believed to be linked to a former burn pit where soldiers practised extinguishing fires with PFAS-containing firefighting foam.
The PFAS levels in groundwater wells at Vint Hill have been detected as high as 1,200 parts per trillion, which is 300 times the EPA's proposed limit for drinking water of 4 parts per trillion. While a direct link between Vint Hill's PFAS contamination and the Occoquan Reservoir has not been established, a 2021 report from the Army Corps of Engineers confirms that groundwater from Vint Hill flows into the Occoquan watershed.
Fauquier County officials and residents have expressed concern over the potential health risks associated with PFAS exposure. The county has conducted PFAS testing at groundwater wells and businesses, with some results showing PFOA and PFOS levels above or near the proposed limit. However, the Fauquier County Water and Sewer Authority's annual reports on water quality at Vint Hill do not include PFAS testing, as the county claims it lacks the necessary capabilities.
Virginia's water regulators are actively working to identify sources of PFAS in the state's water systems, including eight systems from Fauquier and Loudoun Counties. The Virginia Department of Environmental Quality is conducting assessments to determine the presence of PFAS and implement appropriate measures to reduce exposure and health risks.
Pollution Masks: Effective COVID-19 Protection?
You may want to see also
Explore related products
Sources of contamination in the Occoquan watershed
The Occoquan River is a source of drinking water for 800,000 residents in eastern Prince William and Fairfax counties in Northern Virginia. The river has been contaminated with PFAS (per- and polyfluoroalkyl substances), also known as "forever chemicals" due to their persistence in the environment. These toxic chemicals are widespread and extremely difficult to destroy, posing significant risks to human health and the environment. While the sources of PFAS contamination in the Occoquan watershed are still under investigation, here are the potential sources:
Vint Hill:
Vint Hill, a former U.S. Army base located on the border of Fauquier and Prince William counties, is a suspected source of PFAS contamination. The Department of Defense has been monitoring PFAS contamination at Vint Hill, which is believed to be associated with a former fire training pit where soldiers used firefighting foam containing PFAS chemicals. These chemicals leached into the soil and groundwater, and tests have shown PFAS levels in groundwater wells at the facility far exceeding the EPA's proposed limit for drinking water. Groundwater from Vint Hill flows into the Occoquan watershed, raising concerns about the safety of drinking water in the area.
Septic Systems and Wastewater:
Septic systems and wastewater are also potential sources of PFAS contamination in the Occoquan watershed. Everyday activities, such as flushing toilets, using detergents for washing clothes and dishes, and utilizing salt-based water softeners, contribute to the sodium content in wastewater. This sodium eventually finds its way into the Occoquan watershed streams via groundwater. As the population in the watershed increases, the salinity levels in the Occoquan Reservoir have been steadily climbing since 1995. Wastewater from the Upper Occoquan Service Authority (UOSA) is a significant contributor to the "freshwater salinization syndrome" in the reservoir, especially during dry weather periods.
Airports:
Airports in Northern Virginia, such as Dulles International and Manassas Regional, have been identified as sources of PFAS contamination. A fire sprinkler system malfunction at Manassas Regional Airport in 2020 released large amounts of firefighting foam, which contributed to PFAS pollution in the Occoquan River.
Surface Runoff:
Surface runoff is another source of contamination in the Occoquan watershed, especially during wet months. Runoff from impervious surfaces, such as roads and parking lots, washes salt applied by homeowners, businesses, and the Virginia Department of Transportation (VDOT) for improved traction. This runoff carries sodium into the reservoir, increasing its salinity.
While the exact sources of PFAS contamination in the Occoquan watershed are still under investigation, these potential sources highlight the complexity of the issue and the need for further research and effective pollution mitigation strategies.
Pollution's Impact: Biodiversity's Slow Death
You may want to see also
Explore related products
Fairfax Water's testing of PFOA and PFOS levels
The Occoquan River is a drinking water source for 800,000 residents in eastern Prince William and Fairfax counties in Northern Virginia. PFAS compounds, or "forever chemicals", have been detected in the Occoquan Reservoir, as well as in multiple waterways in Fauquier and Prince William counties. PFAS chemicals are man-made and found in an estimated 45% of public drinking water systems globally. They do not break down under normal environmental conditions and persist in the soil and human body for years. They are associated with cancer and other health issues.
Fairfax Water has been testing for PFOA and PFOS levels and has found levels above the EPA's proposed limit of 4 parts per trillion in the Occoquan watershed. Fairfax Water's state-certified Water Quality Laboratory performs or manages the testing required by federal and state regulations. In 2024, almost 45,000 data points were gathered from close to 10,000 samples of water for 203 parameters. Other tests, such as chlorine, pH, and temperature, are performed at the sample location site with portable instrumentation. The majority of the regulatory and water quality monitoring testing, including organic, inorganic, metals, and bacteriological testing, are conducted at Fairfax Water's laboratory using advanced instrumentation.
Fairfax Water has been studying treatment alternatives to remove PFAS at the Griffith Treatment Plant, which treats water from the Occoquan Reservoir, to comply with the PFOA and PFOS Maximum Contaminant Levels (MCLs). They are also actively identifying PFAS sources within their water supplies and have funded a study of the Occoquan watershed. PFAS occurrence testing will continue quarterly. Fairfax Water's data shows that the PFNA, HFPO-DA (GenX chemicals), PFHxS, and PFBS levels in their water are all below the MCLs and HI. Results for Potomac treated water show PFOA and PFOS levels less than the MCL of 4.0 parts per trillion.
While the source of PFAS contamination in the Occoquan Reservoir has not yet been determined, it is believed that the former U.S. Army base at Vint Hill, located at the border of Fauquier and Prince William counties, may be a contributor. The U.S. Department of Defense has been monitoring PFAS contamination at Vint Hill, which is thought to be linked to a former burn pit where soldiers used firefighting foam containing PFAS chemicals. Some tests have shown PFAS levels in groundwater wells at the facility as high as 1,200 parts per trillion, 300 times higher than the EPA's proposed limit for drinking water. A 2021 report from the Army Corps of Engineers confirms that groundwater from Vint Hill flows into the Occoquan watershed.
Mercury Pollution: Ocean's Silent Killer
You may want to see also
Explore related products
The Occoquan River's history and use for water supply
The Occoquan River is a tributary of the Potomac River in Northern Virginia and is considered a scenic area. It is 24.7 miles (39.8 km) long, and its watershed covers about 590 square miles (1,528 square km). The river is formed by the confluence of Broad Run and Cedar Run in Prince William County. The name "Occoquan" is derived from a Doeg Algonquian word that translates as "at the end of the water".
Historically, the Occoquan River served as an important border between the American North and American South. Wolf Run Shoals was a significant crossing point on the river between Alexandria and Richmond during the 18th and 19th centuries. It consisted of three islands and a mill, now submerged due to higher water levels following damming for flood control, water supply, and power generation.
The Occoquan River has three dams along its length. The first dam is located at the town of Occoquan and belongs to the Fairfax County Water Authority. The resulting reservoir serves as a source of drinking water for approximately 800,000 residents in parts of Fairfax and Prince William counties. The Upper Occoquan Service Authority treatment plant is located south of Centreville and west of Route 123, providing treated wastewater to customers in western Fairfax and Prince William counties.
However, the Occoquan River and its reservoir face water pollution threats. Tests have detected PFAS (per- and polyfluoroalkyl substances) contamination in the watershed, potentially linked to the former U.S. Army base at Vint Hill. PFAS chemicals are toxic, persistent in the environment, and harmful to human health. Efforts are underway to identify the sources of contamination and reduce or eliminate PFAS within the watershed.
Explore India's Pollution Control Boards: A Comprehensive Overview
You may want to see also
Frequently asked questions
Yes, the Occoquan River is polluted. PFAS chemicals, which are toxic and widespread, have been found in the river. These chemicals are man-made and do not break down under normal environmental conditions, leading to long-term pollution.
PFAS stands for per- and polyfluoroalkyl substances. These chemicals are toxic and are linked to cancer and other health issues. They accumulate in the human body and persist for years.
The source of PFAS chemicals in the Occoquan River is not yet confirmed. However, there is ongoing testing and monitoring to determine the source. One suspected source is Vint Hill, a former U.S. Army base where PFAS-containing firefighting foam was used, leading to groundwater contamination.
