Groundwater Management Area


The purpose of the Groundwater Management Area is to reduce the nitrate contamination concentrations in groundwater below state drinking water standards.

LYV Groundwater Advisory Committee (GWAC) Approves GWMA Program

On December 13, 2018, the GWAC approved the technically-edited version of the GWMA Program. The four-volume program is under non-project State Environment Policy Act (SEPA) review conducted by Yakima County Planning. The Notice of Environmental Review, Threshold Determination and SEPA Checklist can be viewed here:

The entire adopted Program can be viewed here:

Minority Reports GWMA by Jean Mendoza:

Earlier versions of the program that the GWAC considered can be viewed here:

Yakima County Draft Program-November 2018

  1. YKM County Nov GWMA Program Volume I
  2. YKM County Nov GWMA Program Volume II

Earlier Drafts Released to the GWAC

  1. Sources of Nitrates and the Regulatory Environment Draft VS Released to GWAC 03.01.2018
  2. Program References Draft Version 2 Released to GWAC 03.01.2018
  3. Environmental Effects Draft Version 2 Released to GWAC 03.01.2018
  4. Appendices A B C D E Draft Version 2 Released to the GWAC 03.01.2018
  5. Characterization of the Area Draft Version 2 Released to GWAC 03.01.2018
  6. Volume II 8-2-2018
  7. Volume I 8-2-2018

Does your drinking water come from a private well? Check out these resources:

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