水道水で年1回、井戸水なら年2回の水質検査をお勧めします。

tbd

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。

tbd

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。

tbd

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.