Wellhead Protection

Joe Stump, P.E., Utilities Manager

Office Hours: M - F, 8:00 AM - 4:00 PM
Accounting Office: 574-2290
Engineering Office: 574-2300



In order to facilitate the update of this plan according to the biennial schedule outlined in WAC 246-290-135, existing, easily-accessible databases of potential contamination sources were explored. These sources form the foundation of the inventory database for each community's wellhead protection plan. The following databases are available from the Washington State Department of Ecology:

  • Businesses which handle substances that require a material safety data sheet (MSDS)
  • Businesses that treat, transport, store, or dispose of hazardous wastes
  • Businesses that own and operate underground storage tanks (USTs)
  • Sites occupied by leaking underground storage tanks (LUSTs)
  • Confirmed or suspected sites of contamination
  • Solid waste facilities or landfills

The inventory database was augmented with a telephone book search of high risk businesses and a windshield survey of the WHPAs.   The following potential contamination sources were identified in the windshield survey:

  • Chemical storage areas
  • Recycling and reduction facilities
  • Airports
  • Cemeteries and graveyards
  • Country clubs and golf courses
  • Jewelry and metal plating shops
  • Railroad tracks and yards
  • Electronic equipment manufacturers and storage
  • Dry cleaners
  • Logging and lumber facilities
  • Septic tanks
  • Private wells
  • Stormwater injection wells and catchbasins
  • Population centers (greater than one house per acre)
  • Railroad corridors
  • Pesticide application areas

As part of the regional wellhead protection management plan, Yakima County stores and maintains the regional contaminant source inventory on its Geographic Information System (GIS). The GIS links contaminant inventory and water quality database information to regional mapping for easy storage, retrieval, and analysis of the data. Correlation of these inventory sources with the water quality database is used to identify trends that can be targeted in management efforts.  The following water quality parameters are available from the Washington State Department of Health: 

  • inorganic chemical and physical constituents (IOCs)
  • volatile organic compounds (VOCs)
  • synthetic organic compounds (SOCs)
  • nitrates
  • trihalomethanes
  • radon

View the WHPAs and inventory sites for a water purveyor.