Here are a few options for a WordPress post tag description (“自來水” – Tap Water in Traditional Chinese), ranging in formality and focus:

**Option 1 (Simple and Informative):**

> 自來水：關於家庭用水，公共供水系統，以及水資源管理的文章標籤。 Includes articles discussing domestic water use, municipal water systems, and water resource management.

**Option 2 (Adding a bit more detail):**

> 自來水：涵蓋有關飲用水、水質檢測、供水設施、水費以及如何節水等主題的文章。 Explore articles covering topics like drinking water, water quality testing, water supply infrastructure, water bills, and how to conserve water.

**Option 3 (Emphasizing Policy/Environment):**

> 自來水：關注自來水供應的政策、環境影響、水資源保育以及安全飲水重要性的文章。 Tags articles related to policies surrounding tap water supply, environmental impacts, water resource conservation, and the importance of safe drinking water.

**Option 4 (Slightly More Conversational):**

> 自來水：您關注的都是「好水」嗎？ 在這裡找到關於自來水的一切，從水源頭到您家中的水龍頭。 Discuss articles on tap water, from its source to your faucet, and discover the information you need to ensure safe and quality water.

**Key Considerations for choosing the best option:**

* **Your website’s focus:** Are you primarily focusing on practical advice, policy, or environmental concerns?
* **Your audience:** Are you aiming for a general audience or a more specialized one?
* **Tag usage:** How will you be using the tag? Will articles be broad or focus on specific aspects?

You can adapt these descriptions to best suit your needs. When writing a post tag description in Chinese, it’s generally a good practice to offer a brief and helpful summary which will help your site visitors understand what articles this tag links to.