Water Environment – Water Quality and Aquatic Ecosystems

• Rivers, lakes, marshes The five major rivers continue their rating of "Good" (Level 2 or higher) at upstream points where the majority of water consumption occurs; at downstream points, biochemical oxygen demand and total phosphorous are improving, while chemical oxygen demand is deteriorating
  • Upstream points Paldang Dam (Han River), Andong Dam 1 (Nakdong River), Daecheong Dam (Geum River), Damyang Dam (Yeongsan River), Juam Dam (Seomjin River)
  • Downstream points Noryangjin (Han River), Mulgeum (Nakdong River), Buyeo 1 (Geum River), Naju (Yeongsan River), Gurye (Seomjin River)
    

    Source : Water Environment Information System (National Institute of Environmental Research, 2020)

• Underground water Underground water quality tests carried out in 2018 found 96.9% of underground water to be potable and 85.7% to be non-potable, as has been the average from 2008 to 2018

  < 2008-2018 Trend in Underground Water Quality Test Results >

  2008-2018 Trend in Underground Water Quality Test Results : Classification(%), Potable household water, Non-potable household water, `08 ~ `18 Mean

  Classification(%)	`08	`09	`10	`11	`12	`13	`14	`15	`16	`17	`18	Mean
  Potable household water	6.5	6.4	2.6	1.1	2.5	2.5	1.9	3.0	3.6	5.1	3.1	3.5
  Non-potable household water	-	-	-	14.2	12.8	11.8	13	11.7	14.4	14.8	14.3	13.4

  Source : 2017-2026 Master Plan for Underground Water Management (Revised), 2019 Annual Report on Groundwater Survey

• Aquatic ecosystems Most rivers, lakes, and marshes maintained a rating of "Average" ("C") between 2008 and 2018

  < 2008-2018 Trend in Aquatic Ecosystem Health of Rivers >

  2008-2018 Trend in Aquatic Ecosystem Health of Rivers : Classification(%), FAI, TDI, BMI, HRI의 08년 ~ 18년과 평균값을 안내합니다.

  Classification	`08	`09	`10	`11	`12	`13	`14	`15	`16	`17	`18	Mean (Rating)
  FAI	57.1	55.2	53.8	56.0	57.8	58.8	58.4	57.1	58.1	51.9	52.9	55.6(C)
  TDI	60.6	57.9	53.2	56.3	57.9	59.2	61.1	60.1	61.2	59.1	58.2	58.6(C)
  BMI	66.3	65.8	68.6	68.2	68.5	68.5	67.5	67.0	67.0	59.7	61.8	66.3(B)
  HRI	62.0	62.9	61.7	60.0	52.2	52.1	53.8	53.4	55.7	51.3	52.0	56.1(C)

  Source : 2019 National Institute of Environmental Research survey of 2,031 points nationwide and 3,039 points in rivers
  FAI : Fish assessment index, TDI: Trophic diatom index, BMI: Benthic macroinvertebrate index, HRI: Habitat and riparian index