I don't think HOA fees can be separated, but if HOA includes services such as trash removal, parking etc, you can collect fees on those separately. Also I think water charge could be separated.
See below.
https://howtogeton.wordpress.com/legal-ways-to-pay-more-rent-on-section-8-housing-vouchers/
Separate Non-Rent Expenses
Some leases bundle in services that Housing Authorities do not consider rental expenses. For example:
- Pet fees
- Lawn care & snow removal
- Internet
- Parking spaces
- Cable
- Laundry facilities or washer/dryer in apartment
- Use of sheds or outbuildings
- Snow removal
Some of our readers were able to speak with their landlords and request to remove these fees from their rent. The fees were not included in the “rent,” but instead noted in the lease as a separate fee, or attached to the lease in an addendum.