Santa Barbara is one of California’s most beautiful coastal cities — and one of its most water-stressed. With a population of about 90,000, the city has faced repeated droughts that have tested its water supply to the breaking point. The reactivation of the Charles E. Meyer Desalination Plant in 2017, after sitting mothballed for over two decades, was a dramatic illustration of just how seriously Santa Barbara takes water scarcity. But water quantity is only half the story. Water quality — from PFAS concerns to the challenges of blending multiple supply sources — is the other half.
Where Santa Barbara’s Water Comes From
Santa Barbara’s water supply is remarkably diverse for a city its size. The city draws from five different sources:
- Lake Cachuma — A reservoir on the Santa Ynez River, about 20 miles north of the city. This has historically been the largest single source.
- Gibraltar Reservoir — A smaller reservoir, also on the Santa Ynez River upstream of Cachuma.
- Local groundwater — Wells tapping the Santa Barbara and Foothill groundwater basins.
- State Water Project — Water imported from the Sacramento-San Joaquin Delta through the California Aqueduct. Santa Barbara joined the State Water Project in 1991 after a severe drought.
- Charles E. Meyer Desalination Plant — Treating Pacific Ocean water via reverse osmosis.
This portfolio approach provides resilience, but it also means the city is blending water from sources with very different chemical characteristics. TDS (total dissolved solids), hardness, and mineral content vary significantly between mountain reservoir water, groundwater, imported State Water, and desalinated ocean water. Managing the blend to maintain consistent quality at the tap is an ongoing engineering challenge.
The Desalination Story
Santa Barbara built its desalination plant in 1991-1992 during a punishing drought. When rains returned, the plant was mothballed in 1992 — never having operated at full capacity. It sat idle for 25 years.
Then came the 2012-2016 drought, one of the worst in California’s recorded history. Lake Cachuma dropped to historically low levels, and Santa Barbara faced genuine water supply shortfalls. The city made the decision to reactivate and modernize the desal plant at a cost of approximately $72 million.
The upgraded Charles E. Meyer facility came back online in 2017 with a capacity of about 3 million gallons per day. It uses seawater reverse osmosis (SWRO) technology and produces some of the highest-quality water in the city’s portfolio — very low TDS, minimal mineral content, and essentially free of the contaminants that can affect surface water and groundwater sources.
The plant gives Santa Barbara a drought-proof supply source. Even when reservoirs run dry and State Water allocations get cut, the Pacific Ocean is always there. It’s expensive water — desalination is the most energy-intensive form of water treatment — but it’s reliable.
PFAS at the Airport
Like communities across California, Santa Barbara is dealing with PFAS contamination. The Santa Barbara Airport (SBA) is a likely source of PFAS from historical AFFF use in firefighting training operations. The California State Water Resources Control Board has been investigating PFAS contamination at airports statewide, and Santa Barbara Airport has been part of that investigation [NEEDS VERIFICATION].
Groundwater near the airport may contain elevated PFAS levels, raising questions about whether contamination has migrated toward the city’s production wells. Santa Barbara’s water utility has been testing finished drinking water for PFAS, and the results inform ongoing decisions about which wells to operate and how to manage the blended supply.
California has been more aggressive than the federal government on PFAS regulation, establishing notification levels and response levels for several PFAS compounds that preceded the EPA’s 2024 national standards. For Santa Barbara, this means heightened scrutiny and potential treatment requirements if PFAS levels in any source exceed California’s thresholds.
Water Quality in the Blended Supply
Santa Barbara’s finished drinking water meets all EPA and California state drinking water standards. The city disinfects with chloramine (a combination of chlorine and ammonia) and adjusts pH and mineral content to minimize corrosion in the distribution system.
One challenge specific to Santa Barbara is managing the aesthetic quality of blended water. Desalinated water is essentially pure — very soft, low mineral content. Lake Cachuma water is harder and more mineral-rich. State Water Project water has its own chemical signature. Blending these sources in varying proportions (depending on availability and drought conditions) can cause noticeable changes in taste, hardness, and appearance at the tap.
Some residents notice the taste difference when the desal plant ramps up or down. It’s not a health issue, but it’s a reminder that your water quality can change even when nothing is “wrong.”
What Santa Barbara Residents Can Do
Read the annual water quality report. The City of Santa Barbara publishes detailed reports on water quality across all its sources. Check for PFAS results in particular as new data becomes available.
Be water-wise. Santa Barbara has some of the most stringent water conservation regulations in California. Understanding your household’s usage and following conservation guidelines isn’t optional here — it’s the law during drought declarations.
Consider filtration for taste. If the variable mineral content of blended water bothers you, a point-of-use carbon filter or reverse osmosis system can provide consistent taste and quality regardless of which source is dominant in the blend.
Test private wells. If you’re on a well in the Santa Barbara area, test for PFAS, nitrates, and bacteria. The proximity of agricultural land in the Santa Ynez Valley and potential PFAS sources near the airport make testing particularly important.
If you’re concerned about your water quality, a certified water treatment professional can test your water and advise on solutions.