Last October, property owners across Discovery Bay finished voting on something that could change what it costs to own a home there, whether that home sits on a lagoon or two miles inland. Reclamation District 800, the agency that has maintained the levees protecting the Byron Tract for more than a century, asked property owners to approve its first new assessment since 1999. The preliminary count came back at 61.5 percent in favor. The district's published timeline projected that, if ratified, the new charge would begin appearing on property tax bills in fall 2026.
That vote landed on top of something already locked in. The Town of Discovery Bay Community Services District finished its own rate overhaul in 2025 under the state's Proposition 218 process, and the new water and wastewater rates took effect July 1, 2026. Anyone comparing Discovery Bay's median price to Brentwood, Oakley, or Antioch on a spreadsheet is missing both of these. Neither shows up in a Redfin or Zillow listing. The assessment, if ratified, would show up on property tax bills; the utility rates show up on water bills.
Why the levees need new money now
Reclamation District 800 maintains roughly 19 miles of levees protecting about 7,000 acres of the Byron Tract, including the majority of Discovery Bay. Those levees do more than hold back the Delta. The district's own materials describe managing water circulation and drainage through Discovery Bay's lakes and lagoons, including Willow Lake, and dredging bay channels so boats can still move through them.
The math that got the district to a ballot measure is straightforward. Its property assessment rate has not moved since voters approved it in 1999, even as maintenance, weed and stagnation control, and dredging costs climbed over that same stretch. The district says the shortfall now threatens flood protection, water quality, and navigation access if left unaddressed. The new assessment is projected to raise about $1.567 million in its first fiscal year and continue annually after that, with room to rise each year by the Consumer Price Index up to a 4 percent cap, and only with a separate board vote.
The utility side was already moving
While the levee assessment is new, the CSD's water and sewer increases were finalized well before this fall. The district's rate consultants built a five-year schedule that pushes water rates up sharply in the first year, then continues raising both water and sewer rates annually through fiscal year 2029-2030. Sewer charges show up as a flat annual fee on the property tax bill rather than a monthly line item, which means a portion of this increase is easy to miss if a buyer is only reading the seller's utility statements and not the tax bill itself.
The reason behind the increase is concrete rather than administrative. The district is funding the replacement of roughly 18 miles of aging pipeline, at an estimated cost of about $4 million per mile, along with a solar project and an underwater utility crossing, financed partly through bonds issued in phases so the rate increases arrive gradually rather than all at once. The district's own rate consultant told the board that while Discovery Bay's water bill has historically run low compared to nearby towns, its sewer bill has run high, which is part of why the two are being rebalanced together.
What could stack on a purchase
| Cost layer | Status as of fall 2026 | What it funds |
|---|---|---|
| CSD water and sewer rates | Adopted 2025, effective July 1, 2026, rising annually through FY 2029-30 | Pipeline replacement, solar project, underwater crossing |
| RD 800 levee and drainage assessment | Approved by property owners Oct 23, 2025; the district's timeline projected tax-bill charges for fall 2026, contingent on board ratification | Levee maintenance, lagoon and lake circulation, bay dredging |
Neither line item appears in a median sale price. The CSD rates appear on billing documents; the assessment, if ratified, would appear on property tax bills.
The part that surprises comparison shoppers
The instinct when scanning Discovery Bay against Brentwood or Oakley is to assume these costs belong to the dock estates on the lagoons, the kind of premium a buyer expects to pay for waterfront. That instinct is only half right. Reclamation District 800's levee system protects the majority of Discovery Bay's roughly 3,600 agricultural and residential properties, not just the waterfront segment. If your levees hold, your subdivision exists. If they don't, it doesn't matter how far your lot sits from the nearest dock.
The same logic applies to the utility rates. Every occupied parcel in town uses the CSD's water and sewer system, whether it fronts a canal or sits on a cul-de-sac three streets back from the water. The buyer comparing an inland Discovery Bay listing to a similarly priced home in Antioch or Oakley on the assumption that Discovery Bay's "extra costs" only apply to the water-view lots is working from an incomplete picture. The CSD rates apply throughout town, while the RD 800 assessment reaches most of Discovery Bay’s residential parcels.
What this changes before you write an offer
For a buyer weighing Discovery Bay against other East Bay communities, the sticker price comparison was never the whole story, and it's less complete now than it was a year ago. A few concrete steps close that gap before you're in contract:
- Ask the seller or listing agent for the parcel's current CSD water and sewer billing history, not just the average monthly figure quoted in the listing.
- Request the parcel's Tax Rate Area detail from the county to see which special assessments already apply, and ask directly whether the RD 800 assessment will appear on the next tax bill.
- If the home is on a lagoon or canal, treat dock and bulkhead condition as a separate line item from the district-level costs above. They're different budgets funding different things.
- Build the CSD's five-year rate schedule into your ownership cost projection rather than budgeting off the current monthly bill.
None of this changes whether Discovery Bay is the right fit. It changes how precisely a buyer should price that fit before comparing it against a home in Brentwood, Oakley, or Antioch.
FAQ
Does the RD 800 assessment apply to every home in Discovery Bay? It applies within the district's service area, which covers most of the Byron Tract including the bulk of Discovery Bay's residential parcels. A handful of properties outside the district's boundary would not see the charge, which is worth confirming parcel by parcel rather than assuming based on the address alone.
When could the new levee assessment show up? Property owners voted in October 2025, with 61.5 percent support. The district's published timeline projected that, if ratified, the assessment would first appear on property tax bills in fall 2026.
Are the CSD water and sewer increases still changing, or is this locked in? The five-year rate schedule was adopted in 2025 following the required Prop 218 hearing process, and the new rates took effect July 1, 2026. The increases continue on the published schedule through fiscal year 2029-2030 barring a future rate action.
The CSD's new rates are in effect, while the RD 800 assessment could add another cost if ratified under the district's fall 2026 projection; neither appears in the listing-page number. If you're weighing a specific parcel here against something in Brentwood, Oakley, or Antioch, The Lucas Group can walk through the actual carrying cost, not just the asking price, before you write an offer. Get in touch and we'll help you read the full picture.
This article is general information, not legal, tax or financial advice. Consult a qualified professional about your situation.
