This study tried to investigate and analyze the actual state such as the regional, classified, and material characteristics of the water quality in order to research the several factors by which the filtrated water of the total 250 cases can be polluted in the water tank. The 215 points (86%) clean the water tanks twice a year regularly and J-city has done the best job of cleaning the water tanks. The fifty points (20%) of the total 250 investigation points examine the water quality of the water tanks every year, however, the 175 investigation points (70%) do not execute the inspection of water quality. In the case of the regional characteristics in the water quality, the 23 points (46%) in H-county, the 17 points (34%) in S-county, and the 16 points (32%) in G-city are incongruent in the standard, and the incongruity ratio of the water quality in J-city is the lowest. The result of the classified incongruity shows that total coliforms were found at the 61 investigation points, mesophilic bacteria were found at the 27 points, and turbidity was found at the 12 points. In the case of the material incongruity, concrete was found at the 63 investigation points as the most distinguished factor, and FRP (fiberglass reinforced plastic) at the 23 points, SMC (sheet molding compound) at the 12 points, and stainless steel was found at the 2 points.

Abstract
 1. 서 론
 2. 조사 및 방법
  2.1. 조사기간 및 대상
  2.2. 분석방법
 3. 결과 및 고찰
  3.1. 저수조의 실태조사
  3.2. 조사대상 수질현황
  3.3. 저수조의 지역별 수질특성
  3.4. 저수조의 항목별 수질특성
  3.5. 저수조의 재질별 수질특성
  3.6. 저수조내 일반세균 및 총대장균군 분석결과
  3.7. 저수조내 미생물상 관찰
  3.8. 저수조내 침전물 분석결과
 4. 결 론
 참 고 문 헌

• 박현건(진주산업대학교 환경공학과) | Hyun-Geoun Park (Department of Environmental Engineering, Jinju National University) Corresponding Author
• 류승철(진주산업대학교 수질검사센터) | Seung-Chul Ryu (Water Quality Research Center, Jinju National University)
• 전수임(진주보건소 보건행정과) | Soo-Im Jun (Public Health Administration, Jinju Community Health Center)