Air quality in most areas of Washington State is protected by local clean air agencies. Tribes protect and have authority over their tribal lands. Areas are based on county boundaries except for tribes where the boundary is the reservation. Ecology's regional offices have authority in all other areas

Ambient monitoring measures the status of air quality throughout the state to assess trends, compliance with federal and state air quality standards, effectiveness of control strategies and attainment plans, health effects and environmental damage; respond to citizen complaints; evaluate specific geographic or hot-spot air quality concerns; and create environmental indicators. Emission inventory is the cataloging of sources of air pollution and the emissions from those sources. Inventory data are critical to the understanding of the causes of air pollution problems and creation of appropriate solutions. Meteorological forecasting and dispersion modeling of air pollutants are essential to understanding the movement and buildup of air pollution; the carrying capacity of airsheds; the interaction of pollutants; and the location of maximum impact of sources of pollution. As of September 26, 2005 there are no longer any areas of Washington designated as "NONATTAINMENT."

Ambient monitoring measures the status of air quality throughout the state to assess trends, compliance with federal and state air quality standards, effectiveness of control strategies and attainment plans, health effects and environmental damage; respond to citizen complaints; evaluate specific geographic or hot-spot air quality concerns; and create environmental indicators. Emission inventory is the cataloging of sources of air pollution and the emissions from those sources. Inventory data are critical to the understanding of the causes of air pollution problems and creation of appropriate solutions. Meteorological forecasting and dispersion modeling of air pollutants are essential to understanding the movement and buildup of air pollution; the carrying capacity of airsheds; the interaction of pollutants; and the location of maximum impact of sources of pollution. As of September 26, 2005 there are no longer any areas of Washington designated as "NONATTAINMENT."

Tacoma-Pierce County Nonattainment Area (a.k.a. Wapato Hills-Puyallup River Valley PM2.5 Nonattainment Area)

Tacoma-Pierce County Nonattainment Area (a.k.a. Wapato Hills-Puyallup River Valley PM2.5 Nonattainment Area)

Ambient monitoring measures the status of air quality throughout the state to assess trends, compliance with federal and state air quality standards, effectiveness of control strategies and attainment plans, health effects and environmental damage; respond to citizen complaints; evaluate specific geographic or hot-spot air quality concerns; and create environmental indicators. Emission inventory is the cataloging of sources of air pollution and the emissions from those sources. Inventory data are critical to the understanding of the causes of air pollution problems and creation of appropriate solutions. Meteorological forecasting and dispersion modeling of air pollutants are essential to understanding the movement and buildup of air pollution; the carrying capacity of airsheds; the interaction of pollutants; and the location of maximum impact of sources of pollution. As of September 26, 2005 there are no longer any areas of Washington designated as "NONATTAINMENT."

The Washington State Department of Ecology has conducted monthly water quality monitoring at hundreds of freshwater and marine water quality stations throughout the state since 1959. Ecology monitors about 80 stations each year, some on a one-year basis, some on a five-year rotation, and some are monitored continuously. This spatial data set shows the location of these monitoring stations.

This dataset contains spatial and attribute information of the Surface Water Quality Standards for the State of Washington, Chapter 173-201A WAC. Four views of the WQ Standard are contained in this dataset, Freshwater Beneficial Uses, Seasonal Supplemental Spawning and Egg Incubation Temperature Standards, rules designated in Table 602, and exceptions to Table 602 listed in the footnotes. If any discrepancies are found between GIS layers and the published rule, the published rule takes precedence. Updated April 2018.

This dataset contains spatial and attribute information of the Surface Water Quality Standards for the State of Washington, Chapter 173-201A WAC. Four views of the WQ Standard are contained in this dataset, Freshwater Beneficial Uses, Seasonal Supplemental Spawning and Egg Incubation Temperature Standards, rules designated in Table 602, and exceptions to Table 602 listed in the footnotes. If any discrepancies are found between GIS layers and the published rule, the published rule takes precedence. Updated April 2018.

This dataset contains spatial and attribute information of the Surface Water Quality Standards for the State of Washington, Chapter 173-201A WAC. Four views of the WQ Standard are contained in this dataset, Freshwater Beneficial Uses, Seasonal Supplemental Spawning and Egg Incubation Temperature Standards, rules designated in Table 602, and exceptions to Table 602 listed in the footnotes. If any discrepancies are found between GIS layers and the published rule, the published rule takes precedence. Updated April 2018.

This map shows the general pattern of arsenic contamination from Ruston (Tacoma Smelter Plume) By Census Block Group. With 90% certainty, at least 1 in 10 parcels will have soil arsenic at or above levels shown. Predictions are based on distance and direction from the former Asarco smelter, and on sampling data from forested and other soils undisturbed by development. Actual arsenic levels may vary greatly from parcel to parcel.Disclaimer: Actual arsenic levels may vary greatly from parcel to parcel. Property-specific sampling is necessary to determine the actual amount of arsenic on a given property. How to Sample your own soil - https://ecology.wa.gov/Spills-Cleanup/Contamination-cleanup/Dirt-Alert-program/Soil-samplingPattern and Description of the Tacoma Smelter Plume:There are three major factors to Arsenic deposition (the three D's) but many others exist. 'D'irection- wind rose direction,'D'istance, 'D'isturbanceArsenic tends to exceed state cleanup levels more often than other metals. Lead is the other main contaminant.Arsenic and lead are found mainly in the top six inches of soil.In areas where soil has been moved or turned over, contamination can be deeper.Undisturbed areas, such as forests, tend to have higher levels of contamination.In general, levels are related to distance and direction from the former smelter. Levels decrease with distance and are higher along the dominant north-northeast and south-southwest wind directions.Created a dataset for arsenic(0 to 6 inches sample depth) that had similar study characteristics in the field and lab. Various environmental studies were reviewed because of the size of the study area. Ecology reviewed data from over 130 studies and found 23 studies that had applicable data. Theses studies contained over 22,500 disturbed-residential samples and 1469 undisturbed samples for our analysis.

This map shows the general pattern of arsenic contamination from Ruston (Tacoma Smelter Plume) By Census Block Group. With 90% certainty, at least 1 in 10 parcels will have soil arsenic at or above levels shown. Predictions are based on distance and direction from the former Asarco smelter, and on sampling data from forested and other soils undisturbed by development. Actual arsenic levels may vary greatly from parcel to parcel.Disclaimer: Actual arsenic levels may vary greatly from parcel to parcel. Property-specific sampling is necessary to determine the actual amount of arsenic on a given property. How to Sample your own soil - https://ecology.wa.gov/Spills-Cleanup/Contamination-cleanup/Dirt-Alert-program/Soil-samplingPattern and Description of the Tacoma Smelter Plume:There are three major factors to Arsenic deposition (the three D's) but many others exist. 'D'irection- wind rose direction,'D'istance, 'D'isturbanceArsenic tends to exceed state cleanup levels more often than other metals. Lead is the other main contaminant.Arsenic and lead are found mainly in the top six inches of soil.In areas where soil has been moved or turned over, contamination can be deeper.Undisturbed areas, such as forests, tend to have higher levels of contamination.In general, levels are related to distance and direction from the former smelter. Levels decrease with distance and are higher along the dominant north-northeast and south-southwest wind directions.Created a dataset for arsenic(0 to 6 inches sample depth) that had similar study characteristics in the field and lab. Various environmental studies were reviewed because of the size of the study area. Ecology reviewed data from over 130 studies and found 23 studies that had applicable data. Theses studies contained over 22,500 disturbed-residential samples and 1469 undisturbed samples for our analysis.

This map shows the general pattern of arsenic contamination from Ruston (Tacoma Smelter Plume) By Census Block Group. With 90% certainty, at least 1 in 10 parcels will have soil arsenic at or above levels shown. Predictions are based on distance and direction from the former Asarco smelter, and on sampling data from forested and other soils undisturbed by development. Actual arsenic levels may vary greatly from parcel to parcel.Disclaimer: Actual arsenic levels may vary greatly from parcel to parcel. Property-specific sampling is necessary to determine the actual amount of arsenic on a given property. How to Sample your own soil - https://ecology.wa.gov/Spills-Cleanup/Contamination-cleanup/Dirt-Alert-program/Soil-samplingPattern and Description of the Tacoma Smelter Plume:There are three major factors to Arsenic deposition (the three D's) but many others exist. 'D'irection- wind rose direction,'D'istance, 'D'isturbanceArsenic tends to exceed state cleanup levels more often than other metals. Lead is the other main contaminant.Arsenic and lead are found mainly in the top six inches of soil.In areas where soil has been moved or turned over, contamination can be deeper.Undisturbed areas, such as forests, tend to have higher levels of contamination.In general, levels are related to distance and direction from the former smelter. Levels decrease with distance and are higher along the dominant north-northeast and south-southwest wind directions.Created a dataset for arsenic(0 to 6 inches sample depth) that had similar study characteristics in the field and lab. Various environmental studies were reviewed because of the size of the study area. Ecology reviewed data from over 130 studies and found 23 studies that had applicable data. Theses studies contained over 22,500 disturbed-residential samples and 1469 undisturbed samples for our analysis.

These polygon features represent Water Quality Improvement (WQI) projects managed by the Washington State Department of Ecology. WQI projects can be TMDLs, Straight To Implementation (STI) plans, 4b projects and TMDL Alternatives. The boundaries show where the WQI project applies and is being implemented. TMDL Boundaries identified as "In Development" are considered draft and are subject to change when the project has been approved by the U.S. EPA. U.S. EPA only approves TMDLs and 4b projects. Boundaries are representations of each particular project and does not replace the official version of the approved TMDL report. Please see the TMDL Project webpage for specific information about that project. TMDL projects are required by the Federal Clean Water Act to identify pollution sources and pollution load reductions needed for water bodies to meet water quality standards. Once a TMDL project has been approved by the U.S. EPA, it enters an implementation phase where both point source and non-point source pollution is reduced through permit limits regulated under the NPDES system and through best management practices for land uses that contribute to non-point source pollution. Ecology’s water quality program works with permittees, local governments, watershed stakeholders, and residents to reduce sources of pollution to protect our aquatic resources and public health.

These polygon features represent Water Quality Improvement (WQI) projects managed by the Washington State Department of Ecology. WQI projects can be TMDLs, Straight To Implementation (STI) plans, 4b projects and TMDL Alternatives. The boundaries show where the WQI project applies and is being implemented. TMDL Boundaries identified as "In Development" are considered draft and are subject to change when the project has been approved by the U.S. EPA. U.S. EPA only approves TMDLs and 4b projects. Boundaries are representations of each particular project and does not replace the official version of the approved TMDL report. Please see the TMDL Project webpage for specific information about that project. TMDL projects are required by the Federal Clean Water Act to identify pollution sources and pollution load reductions needed for water bodies to meet water quality standards. Once a TMDL project has been approved by the U.S. EPA, it enters an implementation phase where both point source and non-point source pollution is reduced through permit limits regulated under the NPDES system and through best management practices for land uses that contribute to non-point source pollution. Ecology’s water quality program works with permittees, local governments, watershed stakeholders, and residents to reduce sources of pollution to protect our aquatic resources and public health.

These polygon features represent Water Quality Improvement (WQI) projects managed by the Washington State Department of Ecology. WQI projects can be TMDLs, Straight To Implementation (STI) plans, 4b projects and TMDL Alternatives. The boundaries show where the WQI project applies and is being implemented. TMDL Boundaries identified as "In Development" are considered draft and are subject to change when the project has been approved by the U.S. EPA. U.S. EPA only approves TMDLs and 4b projects. Boundaries are representations of each particular project and does not replace the official version of the approved TMDL report. Please see the TMDL Project webpage for specific information about that project. TMDL projects are required by the Federal Clean Water Act to identify pollution sources and pollution load reductions needed for water bodies to meet water quality standards. Once a TMDL project has been approved by the U.S. EPA, it enters an implementation phase where both point source and non-point source pollution is reduced through permit limits regulated under the NPDES system and through best management practices for land uses that contribute to non-point source pollution. Ecology’s water quality program works with permittees, local governments, watershed stakeholders, and residents to reduce sources of pollution to protect our aquatic resources and public health.