서울시의 팔당 구의 뚝도 보광동 및 노량진의 수원지의 수도구를 거리별로 17지점을 선정하여 1984년 7월, 8월, 9월, 月 1回씩 수도수 中의 trihalomethane量을 head space法으로 정량한 결과 다음과 같은 결과를 얻었다. 1. 서울시 수도수 中의 total trihalomethane量은 7월, 8월, 9월의 평균값이 각각 32.2, 19.1, 9.8㎍/ℓ이였다. 8월 9월의 trihalomethane量과 비교하면 7월이 현저하게 높았다. 2. 水源池別 total trihalomethane 量은 뚝도 노량진 水源池계통의 수도수가 비교적 높은 값을 나타내었다. 3. 七月의 노량진 水源地의 水道水中의 CHCℓ₂Br의 平均값은 12.9㎍/ℓ로서 전체平均값 6.5㎍/ℓ의 2倍를 나타내고 있었다.

From 17 tap water sampling points throughout the metropolitan Seoul supplied from paldang, Gueui, Bokwang, Noryang jin and Dukdo water treatment plant, using Han river as water source, trihalomethane concentration were measured 3 times during July, August, and September, 1984. Total trihalomethane were high in tap water samples from Noryang jin and Dukdo water treatment plant and low from Gueui water treatment plant. Average trihalomethane concentrations were 32.2㎍/ℓ, 19.1㎍/ℓand 9.8㎍/ℓfor July, August, and September respectively, and by comparing with the trihalomethane concentrations of August and September, that of July was obviously high. It is noted that average CHCl₂Br concentration of tap water supplied from Noryang jin water treatment plant in July was 12.9 ㎍/ℓ which were attained to about twice of total average concentration of 6.5㎍/ℓ.