denkidai to suidoudai ha kouza kara hikiotosi ni site imasu.

• 電気代 = electricity bill / electricity charges
• 水道代 = water bill / water charges

The suffix 代 means cost, fee, or charge for something.

So:

• 電気 = electricity → 電気代 = electricity cost
• 水道 = water service / water supply → 水道代 = water bill

You will see 代 in many everyday words, such as:

• 家賃代 is uncommon, because 家賃 already means rent
• ガス代 = gas bill
• 食事代 = meal cost
• 交通費 is used more often than 交通代 for transportation expenses

と is the particle that means and when joining nouns.

So:

• 電気代 と 水道代 = electricity bill and water bill

It is simply listing two things together.

Because the two nouns joined by と form one combined topic:

• 電気代と水道代は = as for the electricity and water bills...

Japanese often marks the whole noun phrase with は at the end, rather than marking each noun separately.

So this is not:

• 電気代はと水道代は ✘

It is:

• 電気代と水道代は ✔

• 口座 = bank account
• から = from

So 口座から means from (my/the) bank account.

The particle から marks the starting point or source. Here, the money is being taken from the account.

This is very natural with verbs related to withdrawal or deduction.

引き落とし is a noun meaning automatic withdrawal, direct debit, or automatic payment deduction.

It comes from the verb:

• 引き落とす = to deduct, to withdraw from an account

So:

• 口座から引き落とし = withdrawal from a bank account / direct debit from an account

In everyday financial Japanese, 引き落とし often refers to money being automatically taken from your account to pay bills.

The に is used with 〜にする, which means to make something into ..., to choose ..., or to set it as ....

So:

• 引き落としにする = to set it to automatic withdrawal / to choose direct debit as the payment method

Here, 引き落とし is treated as the selected method, and にする marks that choice.

A very literal breakdown is:

• 引き落とし に する = make it automatic withdrawal

にしている is the ている form of にする.

In this sentence, it does not mean someone is actively doing something right this second. Instead, it means:

• I have it set to ...
• I use ... as the method
• I’ve arranged it so that ...

So 引き落としにしています means something like:

• I have it set up for direct debit
• I pay it by automatic withdrawal

This is a very common use of 〜ている for an ongoing state resulting from a decision or arrangement.

Because しています shows an ongoing state or established arrangement.

Compare:

• 引き落としにします
  = I will make it direct debit / I’ll choose automatic withdrawal
  This sounds like a decision being made now or for the future.

• 引き落としにしています
  = I have it set to direct debit / I use direct debit
  This describes the current situation or usual arrangement.

So しています is the natural choice when talking about how your bills are currently paid.

Yes. The subject is omitted, which is very normal in Japanese.

From context, the sentence usually means:

• I have my electricity and water bills set up for direct debit from my bank account.

Japanese often leaves out:

• I
• my
• sometimes even the bills

if they are obvious from context.

So even though English normally needs a subject, Japanese often does not state it.

Almost, but there is a small difference in focus.

• 引き落としにしています focuses on your arrangement/choice
  = I have them set to direct debit.

• A passive-style expression would focus more on what happens to the bills/money
  = They are automatically withdrawn.

So this sentence is slightly more about how you have arranged the payment method.

Japanese often builds sentences in this kind of order:

1. topic
2. source/location/method details
3. main action at the end

So here:

• 電気代と水道代は = as for the electricity and water bills
• 口座から = from my bank account
• 引き落としにして = set to direct debit
• います = am / have been

The main verb-related part comes at the end, which is normal in Japanese.

Yes. しています is in the polite ます style.

A more casual version would be:

• 電気代と水道代は口座から引き落としにしてる。

A more formal written or business-style expression might use other terms, such as:

• 口座振替にしています
• 口座引き落としにしています

But the sentence you were given is polite everyday Japanese.

Yes. 口座振替 is another very common term for payment by bank account transfer/direct debit.

Roughly:

• 引き落とし emphasizes the money being deducted
• 口座振替 is a standard financial/billing term for automatic bank transfer

So these are both natural depending on context:

• 口座から引き落としにしています。
• 口座振替にしています。

In forms, contracts, and official documents, 口座振替 is especially common.

You could break it down that way for grammar study, but that would sound unnatural in English.

A better natural English rendering is:

• I pay my electricity and water bills by direct debit.
• I have my electricity and water bills paid automatically from my bank account.
• I have the electricity and water bills set up for automatic withdrawal from my account.

Literal breakdowns are useful for understanding structure, but natural translations usually sound quite different.