We recommend that mains water have a water-quality test carried out once a year, well water twice a year.
勝手に水質検査を行ったあげく浄水器を売りつけるなど、悪質な訪問販売が多発しています。
There are frequent instances of malicious door-to-door selling, such as pushing water purifiers on people after carrying out water quality tests without permission.
先日我が家の水質検査を行いました。ある有名会社の環境分析センターとかいうところにしてもらいました。
The other day, a water quality inspection was carried out at our house. We had it done by a certain famous company's Environment Analysis Center or some such name.
大気と水質の汚染の問題は住民の増加によってひどくなるだろう。
The problems of air and water pollution will be intensified by the growth of inhabitants.
ときどきタンカーがこぼす石油も水質汚染を増大させる。
Oil often spilled by tankers also adds to water pollution.
その湖は水質汚染で悪名高い。
The lake is notorious for its contamination.
しばしばタンカーがこぼす石油も水質汚染を増大させる。
Oil often spilled by tankers also adds to water pollution.