kousikisaito ni yoru to, kanengomi no syuusyuubi ha doyou desu.

Here are the common readings:

• 公式サイト → こうしきサイト
• によると → によると
• 可燃ごみ → かねんごみ
• 収集日 → しゅうしゅうび
• 土曜 → どよう
• です → です

A couple of notes:

• 公式サイト mixes kanji and katakana. サイト is the loanword site.
• 土曜 is a short form of 土曜日 (どようび), meaning Saturday.

によると means according to.

So 公式サイトによると means according to the official website.

This expression is used when you are giving information from some source, such as:

• 天気予報によると = according to the weather forecast
• ニュースによると = according to the news
• 先生によると = according to the teacher

It tells the listener where the information comes from.

In によると, the に is part of the grammar pattern X によると, which means according to X.

So you should think of によると as one set expression, not as:

• 公式サイトに
  • something separate

Instead, it is:

• 公式サイトによると = according to the official website

This is just how Japanese marks the source of reported information in this pattern.

In this expression, と is part of the fixed grammar によると. It is not the quotation marker in the usual sense, even though historically it is related.

For learners, the simplest and most useful approach is:

• memorize X によると = according to X

There is also a related form X によれば, which also means according to X.

For example:

• 公式サイトによれば、...
• 公式サイトによると、...

Both are natural.

The comma helps separate the source information from the main statement.

So the sentence is structured like this:

• 公式サイトによると、 = according to the official website,
• 可燃ごみの収集日は土曜です。 = the collection day for burnable garbage is Saturday.

Japanese often uses a comma after introductory phrases like this, especially when the phrase sets the context for the rest of the sentence.

可燃ごみ means burnable garbage or combustible trash.

Breakdown:

• 可燃 = combustible / burnable
• ごみ = garbage / trash

In Japan, trash is often sorted into categories, and 可燃ごみ is one very common category.

You may also see:

• 燃えるごみ = burnable trash
• 不燃ごみ = non-burnable trash
• 資源ごみ = recyclable trash/resources

可燃ごみ sounds a bit more official or administrative than 燃えるごみ, which is more everyday and easier to understand.

The particle の links nouns together.

Here:

• 可燃ごみ = burnable garbage
• 収集日 = collection day

So:

• 可燃ごみの収集日 = the collection day for burnable garbage

You can think of の here as something like:

• of
• for
• or a noun-connector

It does not always translate neatly into one English word, but its job is to show the relationship between the two nouns.

収集日 means collection day.

Breakdown:

• 収集 = collection
• 日 = day

So in this context, it means the day when the garbage is collected.

This is a useful municipal / public-information word. In daily life, people might also say things in slightly simpler ways, but 収集日 is very common in official notices, schedules, and websites.

は marks 可燃ごみの収集日 as the topic of the sentence.

So the sentence is saying, roughly:

• As for the collection day for burnable garbage, it is Saturday.

This is a very common Japanese structure:

• X は Y です = as for X, it is Y

Here:

• X = 可燃ごみの収集日
• Y = 土曜

Using は makes 収集日 the thing being talked about.

Because 土曜 is the predicate noun before です.

In a sentence like:

• X は 土曜 です

the pattern is:

• topic + は
• predicate noun + です

You do not need a particle after 土曜 here.

This is the same pattern as:

• 今日は月曜です。
• 出発日は金曜です。

So 土曜です is completely normal.

です makes the sentence polite and neutral.

Without です, the sentence would sound less polite:

• 公式サイトによると、可燃ごみの収集日は土曜だ。

That version is more plain or direct.

Because this kind of sentence is about official information, schedules, or public guidance, です is very natural.

Yes. Both are natural.

• 土曜です
• 土曜日です

Both mean it is Saturday.

The difference is mostly style:

• 土曜 is a little shorter and often used in schedules, calendars, and notices
• 土曜日 is the full form

In official or written contexts, both can appear.

Yes, 公式サイト means official website.

Breakdown:

• 公式 = official
• サイト = site / website

Japanese usually does not use articles like the or an, so whether you translate it as the official website or just an official website depends on context. In this sentence, it most likely means the official website for the city, ward, or organization being discussed.

The sentence has two main parts:

1. 公式サイトによると、

   • according to the official website,

2. 可燃ごみの収集日は土曜です。

   • the collection day for burnable garbage is Saturday.

So the full structure is:

• [Source] によると、[topic] は [information] です

This pattern is very useful and common. You can make many similar sentences with it, such as:

• 天気予報によると、明日は雨です。
• ニュースによると、その店は来月閉店します。

It is a good pattern to memorize.

It is natural, and it sounds slightly official or informational.

That comes from words like:

• 公式サイト
• 可燃ごみ
• 収集日

These are common in notices, municipal websites, and public-service information.

A more casual everyday conversation might use simpler wording, but for posted information about trash collection, this sentence sounds very normal.