Greta Jimenez
Groundwater pollution is a pressing issue in Seattle, Washington, with various contaminants threatening the quality of this vital water resource. The Green-Duwamish River near Seattle has been a particular area of concern, with studies conducted by the United States Geological Survey (USGS) and the Washington Department of Ecology investigating the role of groundwater in contributing to pollutant loading in the river. The unique interactions between groundwater and surface water in the Lower Duwamish Waterway, influenced by heterogenous nearshore subsurface and shoreline conditions, govern the transport of terrestrial contaminants. While data collection and assessment of groundwater quality are ongoing, it is clear that multiple sources of pollution impact Seattle's groundwater. These include agricultural pollution, sewage, stormwater runoff, and toxic chemicals from everyday products and industrial sources. Addressing these pollutants is crucial to ensure safe drinking water and protect the environment and human health.
| Characteristics | Values |
|---|---|
| Groundwater and surface-water interactions | The U.S. Geological Survey (USGS) studied the groundwater and surface-water interactions in the Lower Duwamish Waterway, near Seattle, to understand the transport of contaminants. |
| Contaminants | Polychlorinated biphenyl (PCB) Aroclors and congeners, phthalates, carcinogenic polycyclic aromatic hydrocarbons (cPAHs), arsenic, copper, and zinc. |
| Sources of Contamination | Industrial agriculture, sewage, fossil fuel production, stormwater runoff, and everyday products like car brakes, flame retardants, plastic softeners, and building materials. |
| Impact | Impaired biological function and human use of waterways, contamination of drinking water, and harm to human health and wildlife. |
| Prevention and Management | The Washington State Department of Ecology works to protect groundwater by implementing standards, administering permits, and regulating underground injection projects. The Environmental Protection Agency and organizations like Puget Soundkeeper Alliance also prioritize preventing and managing nonpoint source pollution. |
Explore related products
What You'll Learn
Industrial agriculture, sewage, fossil fuel production, and stormwater runoff
Seattle's groundwater is susceptible to pollution from various sources, including industrial agriculture, sewage, fossil fuel production, and stormwater runoff. These contaminants can infiltrate the city's complex drainage and wastewater systems, impacting both the environment and human health.
Industrial agriculture, particularly in the West and Southwest, is a significant water user, accounting for 80% of freshwater usage in some states. The EPA has reported that elevated nitrate levels in drinking water, often attributed to agricultural practices, can be harmful to humans, causing health issues such as "blue-baby syndrome" and low birth weight. In addition, high nitrate levels may indicate the presence of other agricultural contaminants, such as pesticides. California, Delaware, and Maryland, states with a high concentration of factory farms, have experienced groundwater pollution due to unregulated chemical usage, with dangerous levels of contaminants in their drinking water sources.
Sewage systems in Seattle comprise three types of sewers: combined, separated, and partially separated. While these systems are designed to manage stormwater and wastewater, the aged infrastructure can lead to sewage overflows, particularly during heavy rainfall. The mixture of wastewater and stormwater can result in the discharge of untreated sewage into water bodies, potentially contaminating them with harmful substances.
Fossil fuel production and its associated infrastructure can also impact groundwater quality. For example, the Lower Duwamish Waterway in Seattle has experienced interactions between groundwater and surface water due to shoreline armoring. This has influenced the transport of contaminants into the waterway, leading to dynamic contaminant-transport processes.
Stormwater runoff is a significant contributor to water pollution in Seattle and the surrounding areas. As stormwater flows over developed land, it collects pollutants and carries them into storm drains, eventually reaching Puget Sound's rivers and bays. Impervious surfaces, such as roads, prevent stormwater from soaking into the ground, leading to flooding and further spreading contaminants. The Washington Department of Ecology estimates that stormwater runoff accounts for one-third of the state's polluted waters, causing closures of shellfish and swimming beaches and contaminating drinking water sources.
Gossip: Guard Your Ears and Your Integrity
You may want to see also
Explore related products
Oil spills
One of the most well-known oil spills in Seattle occurred in July 2014 when a train derailed beneath the Magnolia Bridge. Three oil tanker cars ran off the tracks, but fortunately, no oil was spilled or ignited. This incident could have resulted in a significant disaster, as each tanker car was carrying 750 barrels of Bakken crude oil, a highly volatile and toxic substance. The potential impact of such an oil spill in a busy waterway underscores the importance of proactive measures and emergency preparedness.
Another incident involved a truck accident, where a large amount of fuel was spilled into Lake Union. Spill responders were dispatched to collect the oil washing onto the rocks, mitigating the environmental damage. This event demonstrates the crucial role of rapid response in containing and minimizing the impact of oil spills. Seattle's Spill Response Program, part of the city's Stormwater Management Plan, is designed to address such incidents and ensure proper spill prevention and control.
While efforts are being made to prevent and manage oil spills, they continue to pose a significant threat to Seattle's groundwater and waterways. The complex interactions between groundwater and surface water in the Lower Duwamish Waterway, for instance, can facilitate the transport of contaminants, including those from oil spills. Understanding the hydrology and groundwater systems is essential for effective pollution control and the preservation of the region's water resources.
Nitrogen Dioxide: Harmful Air Pollutant or Necessary Evil?
You may want to see also
Explore related products
Pharmaceuticals
The presence of pharmaceuticals in the water supply is a growing concern, as conventional wastewater treatment plants are often ineffective at removing these contaminants. Pharmaceuticals have been detected in effluent from wastewater treatment plants and consequently in surface water, groundwater, and drinking water globally. While the concentrations of pharmaceuticals in water are typically too low to cause acute toxicity, they can have adverse environmental effects. For example, pharmaceuticals can affect the health and behavior of wildlife, including insects, fish, and birds.
There has been a pronounced interest in developing alternative treatments to remove pharmaceuticals from wastewater, such as advances in mycoremediation and bioremediation technologies. These technologies can be used as add-on treatments in wastewater treatment plants to reduce the release of unprocessed pharmaceuticals into the environment.
Thermal Pollution: Understanding Heat's Impact on Nature
You may want to see also
Explore related products
![Health Risks Associated with Exposure to Gasoline Additives - Methyl Tertiary Butyl Ether [MTBE]. Hearing Before a Subcommittee of the Committee on Appropriations, United States Senate](https://m.media-amazon.com/images/I/41n9-uhHw6L._AC_UY218_.jpg)
Polychlorinated biphenyl (PCB) Aroclors and congeners
Polychlorinated biphenyls (PCBs) are a group of man-made organic chemicals that consist of carbon, hydrogen, and chlorine atoms. They are derived from biphenyl, which has the formula C12H10, and in PCBs, some of the hydrogen atoms are replaced by chlorine atoms. PCBs have no known taste or smell and can range in consistency from an oil to a waxy solid. They are hydrophobic with low water solubility but have high solubility in most organic solvents, oils, and fats.
PCBs were domestically manufactured in the United States from 1929 until their production was banned in 1979 by the Toxic Substances Control Act (TSCA). They were used in hundreds of industrial and commercial applications due to their non-flammability, chemical stability, high boiling point, and electrical insulating properties. However, PCBs are toxic and can cause various health problems, including endocrine disruption, neurotoxicity, and increased cancer and neurological problems, especially in those exposed as neonates.
Aroclors are a series of PCB mixtures produced from approximately 1930 to 1979 and are one of the most common trade names for PCB mixtures. The number of chlorine atoms and their location in a PCB molecule determine many of its physical and chemical properties, and Aroclors are identified by a distinguishing suffix number that indicates the degree of chlorination. For example, Aroclor 1260 contains 60% chlorine by mass.
The United States Geological Survey (USGS), in cooperation with the Washington State Department of Ecology, conducted a study on the groundwater system of the lower Duwamish River valley near Seattle, Washington. The study included an assessment of the water-quality parameters, including polychlorinated biphenyl (PCB) Aroclors and congeners, phthalates, carcinogenic polycyclic aromatic hydrocarbons (cPAHs), arsenic, copper, and zinc. The results from the Duwamish subwatershed indicated known contamination in the area.
PCBs continue to be a concern as they do not readily break down once released into the environment and can remain for long periods, cycling between air, water, and soil. They can be carried over long distances and have been found in areas far from their release, including in snow and seawater. Proper disposal of PCB-containing consumer products and hazardous waste sites containing PCBs is crucial to prevent further contamination.
Land Pollution: Causes and Effects
You may want to see also
Explore related products
Arsenic, copper, and zinc
The Green-Duwamish River near Seattle has been a particular area of concern for groundwater pollution. The United States Geological Survey (USGS) has provided technical support to the Washington Department of Ecology in assessing the role of groundwater in contributing to pollutant loading in this river system. The presence of arsenic, copper, and zinc in the groundwater has been identified as a significant issue within the Green-Duwamish watershed.
Arsenic is a metalloid commonly associated with atmospheric contamination. Its presence in the environment can be attributed to emissions from vehicles, planes, and industrial facilities, such as cement production plants, metal refineries, and power plants burning coal or natural gas. Arsenic has been detected in the surface sediment of Lake Washington, with concentrations described as "approaching levels of concern" during storms.
Copper and zinc are also prevalent pollutants in the region. Copper is used in brake pads and boat paints, and its concentration in the environment is of particular concern. While copper and zinc levels in Lake Washington do not currently exceed water quality standards, studies have indicated that their concentrations are increasing and are "approaching levels of concern."
The unique features of groundwater and surface-water interactions in the Lower Duwamish Waterway, which is part of the Green-Duwamish River system, further contribute to the transport of contaminants. The heterogenous aquifer properties in this area result in dynamic contaminant-transport processes, making it challenging to manage and mitigate the spread of pollutants like arsenic, copper, and zinc.
Smog and Pollution: Damaging Our Respiratory System
You may want to see also
Frequently asked questions
Groundwater is water that collects or flows beneath the earth’s surface, percolating through porous spaces in soil, sediment, and porous rocks, as well as fractures. Groundwater can be polluted by chemicals used or dumped on the ground’s surface, leaks from septic systems, or through interactions with surface water.
The Green-Duwamish River near Seattle, Washington, is known to have contaminated groundwater. The major pollutants in this area include phthalates, polychlorinated biphenyl (PCB) Aroclors and congeners, carcinogenic polycyclic aromatic hydrocarbons (cPAHs), arsenic, copper, and zinc. These pollutants are often the result of industrial agriculture, sewage, fossil fuel production, and stormwater runoff.
The Washington State Department of Ecology (Ecology) is working to protect groundwater from pollution and ensure it meets drinkability and state standards. They implement state groundwater standards, administer permits for discharges, and regulate underground injection projects. The United States Geological Survey (USGS) also provides technical support to Ecology in their assessment and modelling of groundwater pollution in the region.
