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Nitrate Priority Areas (2014)
vector digital data
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Tonia Mitchell
Idaho DEQ
Aquifer Protection Supervisor
1410 North Hilton
Boise
Idaho
83706
US
toni.mitchell@deq.idaho.gov
208 375-0502
8:00-5:00
2014-08-04T00:00:00
2014
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
http://mapcase.deq.idaho.gov/npa
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
Idaho Department of Environmental Quality
<DIV STYLE="text-align:Left;font-size:12pt"><DIV><DIV><P><SPAN>Pursuant to guidance provided in the Department of Environmental Quality (DEQ) policy memorandum entitled "Policy for Addressing Degraded Ground Water Quality Areas" dated March 1, 2000, a statewide list of significantly degraded areas with nitrate was developed. In 2002, the DEQ, in cooperation with the Idaho Ground Water Monitoring Technical Committee (GWMTC) published a ranking of 25 Nitrate Priority Areas (NPAs). The NPAs are areas where elevated levels of nitrate have been found in ground water. In 2013-14, incorporating recent monitoring, 34 NPA's were evaluated and prioritized. DEQ, in conjunction with the GWMTC revised the NPAs published in 2008. The revisions utilized data collected since the original NPAs were developed to evaluate ground water quality changes in existing NPAs and to identify new areas with nitrate degraded ground water. In the summer of 2011 the GWMTC began the process of revising the NPAs. The minimum criterion for a Priority 1 NPA is 25% of sampled wells have nitrate levels at or above 5 milligrams per liter (mg/L). The state and federal drinking water standard, as well as the Idaho Ground Water Quality Standard for nitrate is 10 mg/L. Within a Priority 2 NPA 50% of the sampled wells have nitrate levels at or above 2 mg/L. Almost all developed areas of the state meet this criterion. The NPA Ranking Process (Ranking Process), developed by DEQ, in consultation with the GWMTC, provides the rationale for numerically ranking areas in Idaho with identified ground water degradation from nitrates. The statewide priority list created through this process will be used to prioritize the implementation of protective management strategies or corrective action measures within the NPAs. In the summer of 2011, DEQ began collecting and compiling nitrate results and well location data from the numerous agencies monitoring ground water quality in Idaho. Well location information, sampling date, and nitrate concentration data were received and compiled by DEQ. Spatial information was reconciled and integrated into a Geographic Information System (GIS) coverage. Sources of data included the DEQ public water system database, the Statewide Ambient Ground Water Quality Monitoring Network (Statewide Program), numerous U.S. Geological Survey (USGS) studies, DEQ regional and local monitoring projects, regional studies conducted by the Idaho State Department of Agriculture (ISDA), and dairy sampling by ISDA. Data from 1990 into 2011 were plotted with the corresponding nitrate value. The 2008 NPAs were based on data from 1990 - 2007 and the 2012 NPAs were based on data from 1990-2011. The use of more recent data resulted in a difference of sample numbers between the 2008 and 2012 NPA analysis. For sites with multiple values the most recent value was used. Data from site-specific monitoring projects associated with known point sources of nitrate contamination were not included in the data set. Ground water quality data from about 11,000 wells statewide were compiled and evaluated to develop the 2012 NPAs. The NPAs contain over 4,000 of the 11,000 wells and encompass a combined area of 2,138,930 acres. Approximately 400,000 people are estimated to live within the boundaries of the NPAs. http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf </SPAN></P></DIV></DIV></DIV>
The Nitrate Priority Areas are areas where elevated levels of nitrate have been found in groundwater. The NPA Ranking Process (Ranking Process) can be found at
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
IDEQ, IDWR- Ranking & Trend Analysis
water contamination
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Restriction of Liability: Neither the State of Idaho nor the Idaho Department of Environmental Quality, nor any of their employees make any warranty, express or implied, or assume any legal liability or responsibility for the accuracy, completeness or usefulness of any information or data provided. Metadata is provided for all data sets, and no data should be used without first reading and understanding its limitations. The data could include technical inaccuracies or typographical errors. The Department of Environmental Quality may update, modify, or revise the data used at any time, without notice.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Restriction of Liability: Neither the State of Idaho nor the Idaho Department of Environmental Quality, nor any of their employees make any warranty, express or implied, or assume any legal liability or responsibility for the accuracy, completeness or usefulness of any information or data provided. Metadata is provided for all data sets, and no data should be used without first reading and understanding its limitations. The data could include technical inaccuracies or typographical errors. The Department of Environmental Quality may update, modify, or revise the data used at any time, without notice. The distributor shall not be held liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. The boundaries of the Nitrate Priority Areas are not considered stationary, are subject to change upon receipt of additional water quality data, and are not intended to be used as regulatory designations. Nitrate Priority Areas are intended for agencies to use for prioritizing and focusing resources to develop and implement ground water quality improvement strategies with local communities, per DEQ Policy Memorandum PM-004.</SPAN></P></DIV></DIV></DIV>
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Once the data were located spatially and a value was assigned to each location, NPAs were
delineated. GWMTC reviewed a variety of approaches and discussed the pros and cons of
different methods to delineate NPAs. A single method, which would provide concise, objective,
scientifically defensible boundaries, was GWMTC’s ultimate goal. However, after much
discussion and multiple attempts to use a single method, it was determined that a triad of
different methods provided the best result. To decrease the reliance on the potential subjectivity
of professional judgment, two geostatistical methods, indicator kriging and ordinary kriging,
were incorporated in the process. Geostatistical software packages for indicator kriging and
ordinary kriging, available for ESRI ArcMap, were applied to the data. The two geostatistical
techniques and professional judgment factors are described in simplified terms below.
Indicator kriging considers if a value is above or below a specific concentration. It
analyzes the data and shows the probability of exceeding a specific concentration. The
method allows the user to apply any combination of probability and concentration. For
this process, a 25% probability of exceeding 5 mg/L for nitrate was used.
Ordinary kriging interpolates values between locations with data and contours the data.
Areas located within the contour interval of 3.5 mg/L were used.
The third component of the process includes professional judgment, which considers land
use and knowledge of aquifers and hydrogeologic factors. For example, efforts were
made to not extend NPA boundaries into undeveloped lands.
The use of geostatistical methods provided more objective and scientifically defensible
boundaries. However, NPA boundaries should be still considered estimations that identify
general areas where nitrate levels are more likely to be elevated. NPAs may be considered
analogous to climate zones or precipitation maps, which constantly change. Distinct NPA
boundaries may not be appropriate because of the dynamic nature of ground water systems.
Nitrate levels may fluctuate seasonally or annually for a number of reasons, including flow
direction or water level changes in response to irrigation practices or seasonal land use practices.
Additionally, because nonpoint sources of contamination do not have distinct contamination
plumes like point source releases, the boundaries of NPAs are not definite.
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
Refer to Delineation and Ranking Process for more details:
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
Please refer to the Document:
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
2012-11-09T00:00:00
Restriction of Liability: Neither the State of Idaho nor the Idaho Department of Environmental Quality, nor any of their employees make any warranty, express or implied, or assume any legal liability or responsibility for the accuracy, completeness or usefulness of any information or data provided. Metadata is provided for all data sets, and no data should be used without first reading and understanding its limitations. The data could include technical inaccuracies or typographical errors. The Department of Environmental Quality may update, modify, or revise the data used at any time, without notice.
http://www.deq.idaho.gov/media/1117845/nitrate-priority-area-delineation-ranking-2014.pdf
Tonia Mitchell
Idaho DEQ
Aquifer Protection Superviso
1410 North Hilton
Boise
Idaho
83706
US
tonia.mitchell@deq.idaho.gov
208 375-0502
8:00-5:00
Tonia Mitchell
IDEQ_Nitrate_Priority_Aras_2014
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