Board approves ADEQ‑backed design study for Oso Wash E. coli remediation, pledges cross‑border coordination

May 20, 2026

Supervisors approved an intergovernmental agreement with ADEQ to fund a 15% concept/design study for Oso Wash/Brickwood Canyon E. coli remediation (15% design cost $36,000; ADEQ $20,000 reimbursable, county match ~$16,220) and discussed coordination with Nogales and Mexican authorities.

The full story

The Santa Cruz County Board of Supervisors voted May 20 to approve an intergovernmental agreement with the Arizona Department of Environmental Quality to fund conceptual engineering and design work for E. coli remediation in Oso Wash and Brickwood Canyon.

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