OREGON: Southern  Willamette Valley

   Groundwater Management Area

   A Regional, Multi-jurisdictional Approach to
   Groundwater Protection


   The Oregon Department of Environmental Quality declared a Groundwater Management
   Area for a portion of the Southern Willamette Valley because of high nitrate. The 230
   square mile area includes five cities, and portions of three counties with multiple land
   uses.  A stakeholder group known as the Groundwater Management Area Committee,
   incorporated about 60 strategy recommendations into an Action Plan, which propose
   voluntary actions to address potential risks to the groundwater resource. Rather than
   focusing solely on nitrate, the Committee also took advantage of the recently completed
   Source Water Assessments and incorporated strategies to reduce other potential risks to
   the 50 public water systems within the same area. The Committee focused on common
   high and medium risks within the 5 year time of travel.

   Location: A 230 square mile region, including three counties and five cities within the
   Southern Willamette Valley, Oregon, with a population of about 23,000.

   Water Supply: There are 52 public water systems, with all but one being sole source
   ground water systems. There are 37 larger systems (serving at least 25 people or 15
   connections) and 15 smaller state regulated systems.  The 9,000 rural residents rely on
   domestic wells for their water supply.

   Source Water Assessment: Multiple studies indicate high (>7 mg/L) nitrate levels in the
   ground water throughout the area. The area was declared a Groundwater Management
   Area in 2004 because of high nitrate levels throughout the region. Fifteen public water
   systems have tested positive for nitrate  levels greater than 7 mg/L in the past five years.

        Combined data from the Source Water Assessments of the public water systems
         indicate that there are about 40 different types of potential contaminant sources
         with about 75 percent of those considered a high or medium risk.

        The most common potential contaminant sources include agriculture (irrigated
         and non-irritated, heavily used transportation corridors, large onsite septic
         systems, wells/abandoned wells, and high-density housing.  Other risks include
         hazardous waste spills, vehicle and equipment repair facilities, fuel and/or
         chemical storage tanks, and a variety of commercial enterprises.

   Priority Contamination Threats

   Both surface and  ground water quality in the region is threatened by agricultural
   activities and unplanned  development.
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          Priority threats of nitrogen/nitrate come from fertilizer use, high density
          development using septic systems, animal waste from confined feeding
          operations or small farm livestock, and large permitted onsite wastewater
          treatment facilities.

          Contamination threats that are high or moderate in risk and are closest to the
          wells (within 5-year time of travel zones) are priorities and include agricultural
          practices, major roadways, large onsite septic systems, wells/abandoned wells,
          and high-density housing.

   Local Team and Developing the Protection  Plan

   A stakeholder group known as the Groundwater Management Area Committee
   developed an Action Plan, which includes 60 voluntary strategies to address potential
   risks to the ground water resource. The stakeholder group, appointed by the Oregon
   Department of Environmental Quality (DEQ), is comprised of a cross-section of principle
   land use sectors in the region, and includes realtors, farmers, public works staff, county
   commissioners, a small city mayor, residents, representatives of small and large
   businesses, an engineering firm, among several others.  Rather than focus solely on
   nitrate, the known contaminant in the region, the Committee also took  advantage of
   Source Water Assessments and addressed other "potential" contaminant risks to public
   water supplies.

   The core staff coordination team is comprised of Lane Council of Governments, DEQ,
   Oregon State University Extension Service and Oregon Department of Agriculture
   (ODA).  The DEQ is the lead agency responsible for project oversight, Lane Council of
   Governments brings strong regional coordination skills combined with  GIS expertise,
   OSU Extension has extensive contact and rapport with rural residents  and ODA leads
   the agricultural portion of the work. About 20 other partners are also fully engaged
   providing technical and planning expertise as needed. These include city and county
   staff and public officials; the Departments of Human Services, Water Resources, and
   Land Conservation and Development; watershed councils;  the Rural Community
   Assistance Corporation and public water system operators.

   Protection  Measures

   This project is to reduce contributions of nitrate to ground water and to prevent other
   potential contaminants from reaching the water supply.  To reach this end, community
   based, voluntary mechanisms have been  identified and can be categorized in the
   following ways:

          Outreach and Education: Getting the word out about ground water contamination
          issues, and what can be done by all land users to reduce contamination risk.

          Incentives: Encouraging ground water protection and offsetting potential
          financial burdens.

          Technical Assistance: Linking technical experts with residents,  farmers, local
          government leaders, and business owners.
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          Planning Tools: Land use considerations that could be implemented to protect
          and restore ground water quality.

          Research:  Measuring the effectiveness of methods to protect ground water

          Monitoring: Implementing a ground water monitoring network that will allow an
          assessment of the improvement of ground water quality.

   Program Effectiveness

    In 2010 a formal review of project progress and effectiveness will be conducted
   providing an assessment using a three pronged measurement:

          Action Plan Strategy Implementation:  This measurement tracks the number of
          strategies in the Action Plan, implemented over time. Twice a year, staff compiles
          a list of activities that have been performed during the last 6 month period. The
          GWMA Committee reviews the activities and provides direction for future strategy
          implementation. The "nitrogen/nitrate budget" completed  in 2008, provides an
          estimation  of the amount of nitrogen/nitrate contributions by land use. This
          budget can forecast contaminant reductions that result from behavior and land
          use changes and then can measure the actual changes in nitrogen/nitrate
          contributions as strategies are implemented and land use practices change.

          Public Awareness  and Understanding: Currently a survey is being distributed for
          baseline measurement of resident's awareness and understanding of the
          GWMA. A follow-up survey will be conducted every 3-5 years to measure
          changes in that understanding and awareness.

          Groundwater Quality Monitoring: The target load reduction is to bring nitrate
          levels below 7mg/L Groundwater quality monitoring that will ultimately measure
          the effectiveness of the Action Plan includes:

                Baseline and Long-Term Methodology - In 2006, the DEQ began
                 sampling at 40 quasi-randomly selected, distinct, and consistent locations
                 to create a  baseline to measure future results against. Samples from
                 these locations are collected and lab analyzed quarterly establishing a
                 solid baseline. The monitoring network of 25 monitoring wells and 15
                 domestic wells will continue to be used to quantify changes in
                 groundwater quality.
                Supplemental Monitoring Data - The Voluntary Monitoring Network
                 includes 125 domestic wells.   Residents are collecting and analyzing
                 these samples on a regular basis as determined by the neighborhood.

   Contingency  Planning

   Three of the cities in the GWMA have individual Drinking Water Source Protection Plans
   that include a contingency planning component.  In addition nearly all of the 37 larger
   public water systems have developed contingency plans that establish protocol in case
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   of source contamination, emergency spill or other potential loss of water availability.
   Several of the jurisdictions in the area have conducted mock exercises to help
   coordinate and prepare for emergency contamination and/or water loss situations.

   For further information, contact:
   Denise Kalakay (541) 682-7415.
   Senior Planner
   Lane Council of Governments
   99 East Broadway
   Eugene, OR 97401

Office of Water (4606M)                        816F10042                              January 2010