• Evaluation of Nitrate Nitrogen Contamination Degree in Groundwater Wells, Jeju Island
  • Sung-Ho Song1*·Dongjun Hwangbo1·Ki-Young Jang1·Jin-Sung Kim1·Sang-Ki Seo1·Won-Seok Yang2

  • 1Jeju Headquarter, Korea Rural Community Corporation
    2Water Policy Division, Jeju Special Self-Governing Province

  • 제주도 지하수 관정 내 질산성질소 오염도 평가
  • 송성호1*·황보동준1·장기영1·김진성1·서상기1·양원석2

  • 1한국농어촌공사 제주지역본부, 2제주특별자치도 물정책과

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this study, the evaluation standard for nitrate nitrogen contamination degree (WELCUP) was established using six factors that influence the groundwater quality in Jeju Island. To do this, weightings, ranges, and ratings were assigned for each factor and the relative possibility of nitrate nitrogen contamination degree was evaluated using WELCUP index for each well. As a result of calculating the WELCUP index using groundwater quality data of 5,112 wells in Jeju Island for 27 years (1993-2019), all 61 wells with the WELCUP index value higher than 100 are distributed in Daejung and Hangyung watershed with relatively large area of farmland in Jeju Island. In particular, as the ratio of private wells is more than 64%, it is necessary that systematic management is needed for private wells in terms of nitrate nitrogen contamination. Consequently, based on the results of applying the WELCUP evaluation standard, it is necessary to select the prioritization of nitrate nitrogen contamination pathways project for groundwater wells in Jeju Island

Keywords: Nitrate nitrogen contamination degree, WELCUP index, Groundwater well, Jeju Island

This Article

  • 2021; 26(4): 8-19

    Published on Aug 31, 2021

  • 10.7857/JSGE.2021.26.4.008
  • Received on Jul 2, 2021
  • Revised on Jul 7, 2021
  • Accepted on Aug 5, 2021

Correspondence to

  • Sung-Ho Song
  • Jeju Headquarter, Korea Rural Community Corporation

  • E-mail: shsong@ekr.or.kr