San Diego County supervisors order health, economic studies and seek $50 million as Tijuana River sewage crisis worsens
San Diego County supervisors unanimously approved on Sept. 9, 2025, new epidemiological, economic and toxic‑hotspot studies and a formal state funding request to address recurring sewage and industrial discharges fouling the Tijuana River watershed.
Key takeaways
- Sept. 9, 2025 vote: Board approved multiple studies and action items to document impacts and seek funding.
- Studies ordered: Epidemiological health study, economic impact assessment and targeted toxic‑hotspot sampling.
- Funding request: County will formally seek $50 million from the State of California for mitigation and infrastructure.
- Advocacy: Expanded federal lobbying and binational strategies to address pollution sources upstream in Mexico.
What the board approved
The San Diego County Board of Supervisors directed staff to design three coordinated studies and to pursue near‑term funding and advocacy steps to reduce ongoing contamination affecting neighborhoods, beaches and regional commerce.
Health study
Scope: Launch an epidemiological study to document health effects of chronic exposure to sewage pollutants — including hydrogen sulfide and other airborne emissions — and to evaluate immediate and long‑term outcomes for vulnerable groups such as children and workers near the river and shorelines.
San Diego State University researchers and community advocates have urged formal health tracking for years to corroborate repeated complaints of illness and exposure.
Economic study
Scope: Assess economic losses to small businesses, tourism and property values caused by frequent beach closures, odor events and diminished regional brand value — producing quantifiable figures the county can use to argue for state and federal aid.
Hotspot identification and remediation planning
Staff will map “toxic hotspots” — for example, areas such as Saturn Boulevard where river turbulence can release gases from contaminated sediments — and develop targeted remediation plans to reduce air emissions impacting nearby neighborhoods and schools.
Funding, lobbying and project pauses
The board unanimously voted to formally request $50 million from the State of California for immediate infrastructure and mitigation work in the Tijuana River Valley to reduce cross‑border flows and protect affected communities.
Supervisors also approved amplified federal advocacy, including hiring a federal lobbyist and pursuing multi‑agency binational strategies to address upstream pollution sources in Mexico rather than exclusively expanding U.S. treatment capacity.
As a near‑term funding shift, the board reallocated $270,000 that had been reserved for the “Gateway to the Californias” river park project toward pollution abatement and study work, pausing new development until contamination risks are better understood.
Why now: health and economic alarms
Residents, community leaders and researchers have long reported foul odors, respiratory symptoms among children and workers, and repeated beach closures. County officials say the new studies will provide the empirical data needed to press for state and federal funding and to plan targeted cleanup and protective measures.
“A formal health study is long overdue,” said Paula Stigler Granados of San Diego State University, noting repeated community reports of illness and exposure.
Wider policy moves
State lawmakers in Sacramento have advanced legislation to strengthen protections for the Tijuana River watershed, aligning with the county’s funding request and reflecting growing attention to the binational public‑health consequences of cross‑border pollution.
At the federal level, the U.S. and Mexico have negotiated joint efforts and agreements to reduce flows and upgrade treatment, but local leaders say recurring discharges persist and continue to close beaches and threaten neighborhoods.
What comes next
The Sept. 9 board vote sets policy direction; staff will return with proposed study designs, costs, research partners and timelines. Officials cautioned that rigorous scientific planning is required and that specific results will take time.
Implications for Los Angeles, California
Economic: Continued beach closures and odor events could reduce regional visitor confidence and affect tourism across Southern California, including spillover effects for Los Angeles businesses that depend on coastal recreation.
Political & social: Los Angeles officials and advocates may monitor the county’s state funding request and health findings to support broader statewide investments, environmental‑justice claims, and coordinated binational water management.
Practical: County study designs — including health tracking, economic loss calculations and hotspot mapping — could serve as templates for other regions and support cross‑jurisdictional emergency response and long‑term watershed projects.
Sources and further reading
- The Coronado News: San Diego County supervisors approve studies on sewage crisis impacts
- KPBS: County to study health, economic impacts of cross‑border sewage
- Voice of San Diego: South County report — Aguirre wields new powers against sewage crisis
- San Diego State University lecture/remarks (researcher comments)
- EPA press release on U.S.-Mexico agreement to address pollution
- California Senate office: legislative package protecting Tijuana River watershed
