This study characterized water quality of groundwater and purified water used for drinking water in 30 schools in Gyeongsangbukdo Province. The results of the study showed that 43% of groundwater and 45% of purified water were not suitable for drinking. Among them, microbial contaminations were the most serious problem. In raw groundwater, the exceeding rates of total colony counts was the highest in August (53.6%). Purified water samples showed higher rate of exceeding drinking water standard for total colony counts while showing lower rate of exceeding drinking water standard for total coliforms and fecal coliforms in March and August. Overall, proper managements for microbial contaminations are required for both groundwater and purified water. Furthermore, special attention should toward students not to drink water when groundwater or purified water exceeds the drinking water quality standard.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 조사대상 및 시료준비
  2.2. 조사방법
 3. 결과 및 고찰
  3.1. 지하수 수질조사 결과
  3.2. 수질항목별 수질특성
  3.3. 정수기사용에 따른 수질변화
 4. 결 론
 참 고 문 헌

• 김숙찬(경상북도 보건환경연구원) | Suk Chan Kim (Gyeongsangbukdo Government Public Institue of Health & Environment)
• 배헌균(계명대학교 환경대학 지구환경학과) | Hun-Kyun Bae (Department of Global Environment, Keimyung University) Corresponding Author