Photo above: Hercules City Hall. Coro, CC BY-SA 4.0, via Wikimedia Commons.
Maybe, and you can find out for a specific address before you write an offer. Pull the home’s current Contra Costa County property tax bill for special taxes and assessments, then ask the seller for the HOA documents if the home sits in an association.
Don’t guess from the listing. Two homes on the same Hercules street can carry different charges. Here’s how to check.
What is Mello-Roos?
It’s a special tax on top of your regular property tax. A city, county, school district or other local agency can form a Community Facilities District (CFD) under the Mello-Roos Community Facilities Act of 1982, and that district levies a special tax on the parcels inside it to pay for things like roads, sewers, parks, schools or ongoing services (California State Treasurer, California Debt Financing Guide, section 3.3.7.2, checked September 24, 2026).
A few things to know:
- Forming a CFD takes a two-thirds vote (same source).
- The special tax is collected on the county property tax bill, next to your regular tax.
- It is not based on the home’s value the way regular property tax is. The district sets its own formula.
- Some CFD taxes end when the bonds are paid off. Taxes that fund ongoing services can keep going. The district’s own documents say which applies.
Does Hercules have Mello-Roos districts?
We could not find one listed by the City or the County. As of September 24, 2026, we did not find a City of Hercules or Contra Costa County page that lists Mello-Roos districts inside Hercules. That is not proof a given parcel has none. The tax bill for the address is the real answer.
What the City does publish: Hercules has five Landscaping and Lighting Assessment Districts. Property owners in each one pay an annual assessment that funds street lighting, park and median landscaping, graffiti removal and similar upkeep (City of Hercules, Landscaping and Lighting page, checked September 24, 2026). These are assessments, not Mello-Roos taxes, but they show up on the same county bill, so you’ll want to know about them too. One of them, the Victoria by the Bay district, has its own page on the City site. Which district a home is in, and what it pays, is on that home’s tax bill.
How do I check a specific Hercules address?
Four steps. Do them before your contingencies run out.
- Look up the tax bill. The Contra Costa County Treasurer-Tax Collector’s online tax portal shows the current bill for a parcel (Treasurer-Tax Collector, checked September 24, 2026). Look for lines below the regular 1% tax: special taxes, fixed charges and assessments. Each line has its own district name.
- Call the district on the bill. The County Auditor-Controller says special assessment amounts are set by the districts themselves, and that you should call the phone number listed next to each assessment on the bill (Contra Costa County Auditor-Controller, Special Assessments FAQ, checked September 24, 2026).
- Read the seller’s disclosures. California Civil Code 1102.6b requires a seller whose property is subject to a Mello-Roos special tax to make a good faith effort to get the notice from the local agency and give it to the buyer. The notice can come from the tax bill or an itemization of assessments (California Legislative Information, Civil Code 1102.6b, checked September 24, 2026).
- Ask for the HOA package if there is an association. See the next section.
One honest limit. The County says it’s hard to predict exactly what a purchased property’s bill will look like, and that special assessment amounts can vary. It suggests looking up the current bill for that parcel or a nearby one to get an idea (Contra Costa County Auditor-Controller, Special Assessments FAQ, checked September 24, 2026). Your regular tax also resets based on your purchase price, so the seller’s bill is a starting point, not your number.
What are HOA dues, and how do I find them?
HOA dues are what you pay a homeowners association to run and maintain the shared parts of a development. Condos and townhomes usually have one. Some single-family neighborhoods do too, so check even if the home is detached. Dues are not on the county tax bill, so you have to get them from the association.
California makes the seller hand them over. Under Civil Code 4525, the seller in a common interest development must give the buyer, as soon as practicable before title transfers, the association’s governing documents, a written statement of current assessments and any unpaid assessments, fines or penalties, any approved changes to assessments that are not due yet, the budget and reserve information the association sends owners each year, and the minutes from the last 12 months if you ask (California Legislative Information, Civil Code 4525, checked September 24, 2026). The association has 10 days from the seller’s request to provide the documents and can charge the seller a reasonable fee (Civil Code 4530, checked September 24, 2026).
Read these for:
- The monthly dues, and any special assessment already approved.
- The reserve summary. Low reserves can mean a future special assessment.
- The rules on rentals, pets, parking and exterior changes.
- The insurance summary. It tells you what the master policy covers and what you’d insure yourself.
Should Mello-Roos or HOA fees stop me from buying?
Not by themselves. They are part of the monthly cost, like the mortgage and insurance. Ask your lender how they count them when figuring what you qualify for. Get the real numbers early, add them to the payment, and compare homes on the total, not the list price.
This page explains how these charges work. It is not tax advice. For how a special tax or assessment affects your own taxes, talk to a tax professional, and for the amount on a parcel, go to the Contra Costa County Treasurer-Tax Collector or the district named on the bill.
Questions people also ask
Is Mello-Roos tax deductible?
It depends, and it’s a question for a tax professional, not us. Some parts of a special tax or assessment may be treated differently from regular property tax, and the rules can change. Bring the Contra Costa County tax bill for the parcel to a tax professional, who can tell you how each line is treated on your return. The County Treasurer-Tax Collector can explain what each line is.
Where do I find the property tax bill for a Hercules home?
Use the Contra Costa County Treasurer-Tax Collector’s online tax portal. You can call the office at (925) 608-9500. It is at 625 Court Street, Room 100, in Martinez, so check the County page for office hours before you go (Treasurer-Tax Collector page, checked September 24, 2026). The bill lists each special tax and assessment with its own line. The phone number beside each line reaches the district that set it.
What HOA documents does a California seller have to give me?
Under Civil Code 4525, the seller gives you the governing documents, a statement of current assessments and anything unpaid, approved assessment changes not yet due, the association’s budget and reserve information, and the last 12 months of board minutes if you ask. The association has 10 days to deliver them after the seller’s request, under Civil Code 4530. Read them before your contingencies expire.
What are landscaping and lighting assessments in Hercules?
They are annual charges from the City’s five Landscaping and Lighting Assessment Districts. They pay for street lighting, park and median landscaping, graffiti removal and similar upkeep, per the City of Hercules Landscaping and Lighting page, checked September 24, 2026. They are not Mello-Roos taxes, but they appear on the same county tax bill, so check that bill for the exact amount.
Your next step
Send us the address you’re looking at. We’ll pull the current tax bill, flag every special tax and assessment line, and ask the listing agent for the HOA package so you see the full monthly cost before you write. Ask a Hercules agent on our team or call (510) 949-5525.
More on Hercules: Living in Hercules, CA · Hercules real estate market update · Search Hercules homes · What’s my home worth?
By Bill Davis, DRE #01880656, The Davis Team at eXp Realty, Hercules, CA. Updated September 24, 2026.
The Davis Team is a real estate team at eXp Realty of California, Inc., DRE #01878277. Bill Davis, DRE #01880656.
Sources
- California State Treasurer, California Debt Financing Guide, 3.3.7.2 Mello-Roos Bonds (Community Facilities Districts): debtguide-api.treasurer.ca.gov (checked September 24, 2026)
- City of Hercules, Landscaping and Lighting: herculesca.gov/government/engineering-public-works/lighting-landscaping (checked September 24, 2026)
- Contra Costa County Treasurer-Tax Collector: contracosta.ca.gov/199 and tax portal taxcolp.cccttc.us/lookup (checked September 24, 2026)
- Contra Costa County Auditor-Controller, Special Assessments FAQ: contracosta.ca.gov/6571 (checked September 24, 2026)
- California Civil Code 1102.6b, 4525 and 4530: leginfo.legislature.ca.gov (checked September 24, 2026)