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Service Description: <div style='text-align:left;'><p><span style='font-size:16px;'>Thirty-five areas in Idaho have been identified as nitrate priority areas (NPAs) with elevated levels of nitrate in ground water, according to a study prepared by the Idaho Department of Environmental Quality (DEQ).</span></p><p><span style='font-size:16px;'>Nitrate is a chemical form of nitrogen found in soil and water. In elevated levels, nitrates can present a risk to human health. NPAs are areas where 25% of the sampled wells contain water with nitrate levels of 5 milligrams per liter (mg/L) or greater. The drinking water standard is 10 mg/L.</span></p><p><span style='font-size:16px;'>DEQ conducted the study in conjunction with the Idaho Ground Water Monitoring Technical Committee, a panel of scientists from state and federal agencies, and health districts.</span></p><p><span style='font-size:16px;'>The 2020 Nitrate Priority Area Delineation and Ranking Process document ranks the 35 areas based on the following three primary criteria:</span></p><p><ul><li><span style='font-size:16px;'>the number of people living in an area that are potentially drinking nitrate-degraded water</span></li><li><span style='font-size:16px;'>the percentage of sampled wells with elevated ground water nitrate concentrations</span></li><li><span style='font-size:16px;'>water quality trends indicating whether nitrate levels are increasing, staying the same, or decreasing.</span></li></ul></p><p><span style='font-size:16px;'>The potential impact of nitrate on other beneficial uses of ground water besides water supply was also considered.</span></p><p><span style='font-size:16px;'>The NPA's are located across Idaho, primarily along the Snake River Plain. The top five NPAs are: NE Star, Mountain Home AFB, Minidoka, Fort Hall, and Marsh Creek.</span></p><p><span style='font-size:16px;'>The study consisted of compiling data from over 14,000 wells statewide. Of these, over 4,300 are located within the boundaries of the NPAs. Approximately 414,000 people are estimated to live within the NPAs.</span></p><p><span style='font-size:16px;'>The document, which contains a complete listing of all 35 NPAs, can be accessed on DEQ's website (download at bottom). Also available online is a summary of comments received on the document during a 60-day public comment period and DEQ responses.</span></p><p><span style='font-size:16px;'>The nitrate priority area ranking is used to prioritize the development and implementation of strategies to help reduce nitrate loading from land-use activities. In coordination with other agencies, DEQ assists local ground water quality advisory groups in developing ground water quality management strategies for NPAs.</span></p><p><ul><li><a href='https://mapcase.deq.idaho.gov/npa' target='_blank'>2020 Nitrate Priority Online Map Application (ArcGIS Enterprise 10.9.1)</a></li><li><a href='https://www.deq.idaho.gov/water-quality/ground-water/ground-water-quality/' target='_blank'>Idaho DEQ Nitrate in Ground Water</a></li><li><a href='https://www2.deq.idaho.gov/admin/LEIA/api/document/download/14704' target='_blank'>Idaho DEQ 2020 Nitrate Priority Area Delineation and Ranking Process (PDF)</a></li><li><a href='https://www2.deq.idaho.gov/admin/LEIA/api/document/download/14705' target='_blank'>2020 Nitrate Priority Area Ranking Summary (PDF)</a></li></ul></p></div>
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Description: Thirty-five areas in Idaho have been identified as nitrate priority areas (NPAs) with elevated levels of nitrate in ground water, according to a study prepared by the Idaho Department of Environmental Quality (DEQ).Nitrate is a chemical form of nitrogen found in soil and water. In elevated levels, nitrates can present a risk to human health. NPAs are areas where 25% of the sampled wells contain water with nitrate levels of 5 milligrams per liter (mg/L) or greater. The drinking water standard is 10 mg/L.DEQ conducted the study in conjunction with the Idaho Ground Water Monitoring Technical Committee, a panel of scientists from state and federal agencies, and health districts.The 2020 Nitrate Priority Area Delineation and Ranking Process document ranks the 35 areas based on the following three primary criteria:the number of people living in an area that are potentially drinking nitrate-degraded waterthe percentage of sampled wells with elevated ground water nitrate concentrationswater quality trends indicating whether nitrate levels are increasing, staying the same, or decreasing.The potential impact of nitrate on other beneficial uses of ground water besides water supply was also considered.The NPA's are located across Idaho, primarily along the Snake River Plain. The top five NPAs are: NE Star, Mountain Home AFB, Minidoka, Fort Hall, and Marsh Creek.The study consisted of compiling data from over 14,000 wells statewide. Of these, over 4,300 are located within the boundaries of the NPAs. Approximately 414,000 people are estimated to live within the NPAs.The document, which contains a complete listing of all 35 NPAs, can be accessed on DEQ's website (download at bottom). Also available online is a summary of comments received on the document during a 60-day public comment period and DEQ responses.The nitrate priority area ranking is used to prioritize the development and implementation of strategies to help reduce nitrate loading from land-use activities. In coordination with other agencies, DEQ assists local ground water quality advisory groups in developing ground water quality management strategies for NPAs.2020 Nitrate Priority Online Map Application (ArcGIS Enterprise 10.9.1)Idaho DEQ Nitrate in Ground WaterIdaho DEQ 2020 Nitrate Priority Area Delineation and Ranking Process (PDF)2020 Nitrate Priority Area Ranking Summary (PDF)
Service Item Id: f51baf5365174f83a1802289e49c97b9
Copyright Text: IDEQ, IDWR- Ranking & Trend Analysis
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Keywords: water contamination,location,geoscientific Information,Ground Water,CAFOS,Feedlots,boundaries,Agriculture,water pollution,Drinking Water,Dairies,nitrate,Aquifers,Department of Environmental Quality,DEQ,nitrate priority,groundwater
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