Arroyo Grande's Water Is All Local Today. Measure D-26 Would Add a State Source.

On September 29, the Arroyo Grande City Council Chamber at 215 East Branch Street holds a town hall that has nothing to do with the Village's shops or its just-wrapped Harvest Festival. The agenda is water, specifically Measure D-26, the ballot measure that asks city voters this November whether Arroyo Grande should formally buy into the California State Water Project for the first time in its history.

Today, the city reports that it relies on 100 percent local water, with 60 to 65 percent of that supply drawn from the Lopez Lake Reservoir and the rest pulled from local groundwater. Federal litigation over that reservoir has brought the city more than $1.6 million in unbudgeted legal costs, and the council has responded by putting a measure before voters that would let the city buy State Water as a standing option.

For anyone comparing Arroyo Grande against other Central Coast towns, the litigation costs and the ballot measure are worth reading alongside median price and days on market, because they bear on how the city plans to diversify a supply that is currently entirely local.

What actually happened at Lopez Lake

In August 2024, four environmental groups sued the County of San Luis Obispo, which owns and operates Lopez Dam, arguing that water releases into Arroyo Grande Creek were too low to protect steelhead trout listed under the Endangered Species Act. That December, a federal judge in Los Angeles agreed and ordered the county to raise releases by roughly 45 percent, pushing flows toward a peak of 7.9 cubic feet per second.

The county appealed, arguing the increase risked draining Lopez Lake outright during a drought and could harm other protected species in the process. On December 3, 2025, the Ninth Circuit Court of Appeals sided with the county and vacated the injunction. Releases have been stepping down since, dropping half a cubic foot per second per day toward a target of 3.8 cfs by the end of January 2026, under a court mandate issued December 29.

The injunction is gone. The underlying lawsuit against the county is not. Litigation continues, and so does the bill.

The invoice that landed on Arroyo Grande's desk

Lopez Lake is shared infrastructure. Five public agencies and a group of agricultural users split its cost and its water under what's called the Zone 3 agreement: Arroyo Grande, Grover Beach, Pismo Beach, Avila Community Services District, and Oceano Community Services District. Arroyo Grande holds the largest entitlement in the group, 50.55 percent, which means it also carries the largest proportional share of whatever the reservoir costs to defend in court.

That share showed up as a $1,426,491.50 invoice for fiscal year 2024-25, an amount the city attributes almost entirely to litigation rather than normal operations. The council authorized an interfund loan in November 2025 to cover it without touching capital projects. Then, between July and November of that year alone, another $190,800 in unbudgeted legal costs arrived. By the time the city's Utilities Division gave its next public update in mid-2026, it put cumulative litigation costs at more than $1.6 million and still rising, a figure nobody wrote into a rate schedule before the lawsuit was filed.

The city has since opened a water rate study, the kind of process that typically ends in a new number on residents' bills rather than a resolution of the underlying legal question.

What a Central Coast farmer thinks the fight is actually about

Not every stakeholder in this case is a city finance department. Talley Farms, a third-generation growing operation in the Arroyo Grande Valley, holds its own Zone 3 entitlement, and its president put the original stakes in blunt terms in a county press release responding to the injunction:

"This order has put us on the path to draining Lopez Lake, the South County's main source of water."

For a buyer whose interest in Arroyo Grande extends past the house and into the surrounding vineyards, that's worth remembering. The reservoir at the center of this case doesn't only fill residential taps. It irrigates the valley that gives Arroyo Grande its wine country identity in the first place.

Why Measure D-26 exists

Arroyo Grande currently cannot buy from the State Water Project under normal conditions. The city is part of a regional delivery system that already blends Lopez Lake water with some State Water for other Zone 3 users, but Arroyo Grande itself is not an official Project participant, and by its own account can only purchase State Water during a locally declared emergency.

Measure D-26 would change that, enrolling the city as a standing participant rather than an emergency exception. City Manager Matthew Downing has framed the town halls as an exercise in transparency rather than persuasion, telling residents the sessions exist so "everyone understands the details of these measures and what they could mean for the future of Arroyo Grande."

Whether or not the measure passes, the rate study moves forward on its own timeline. Buying into the State Water Project would diversify where the city's water comes from. It would not erase the legal costs already booked, and it would not guarantee the underlying lawsuit resolves quickly. State Water carries its own delivery costs, and joining the Project is a long-term financial commitment layered on top of the one Arroyo Grande is already paying to defend Lopez Lake.

What this means if you're comparing towns, not just houses

A water bill rarely shows up in the numbers a buyer compares between towns. Median price, days on market, and price per square foot travel easily across a spreadsheet. A pending Endangered Species Act lawsuit tied to a shared reservoir doesn't, and yet it may be a more durable signal about what a property actually costs to hold over the next decade.

Nothing in the research points to a shortage today. The city's water comes from local sources, and the council is weighing a State Water option as part of its long-term planning while the Lopez Lake case plays out. Anyone weighing Arroyo Grande against Grover Beach, Pismo Beach, or another Zone 3 town can compare how each city shares in the Lopez Lake costs and how each is responding.

Buyers can read the city's own litigation updates directly, or fold current utility rate trends into standard due diligence, the same way they'd ask about an assessment history or an HOA budget.

A few questions worth asking before you commit

• Has the seller's water bill changed in the last 12 months, and is any increase itemized as rate study related or litigation related?
• Is the property inside Arroyo Grande's Zone 3 allocation, or does it draw from an independent well?
• If Measure D-26 passes in November, is that a citywide cost regardless of address, or does it change anything specific to the property?

None of these have a clean one-line answer yet. The lawsuit is still open, the rate study isn't finished, and the ballot measure hasn't been decided. Asking now simply means asking before the number gets set instead of after.

Total Real Estate Advisors tracks the civic and infrastructure decisions shaping Central Coast property values, not just the comps. If you're weighing Arroyo Grande against another South County town and want a clear read on what a specific address is actually exposed to, Total Real Estate Advisors can walk through it with you. Schedule a free consultation.