Some movement on a Tijuana River sewage solution

• The ask follows a letter last week from California's U.S. senators to leaders of the upper house requesting the same $310 million.
• Gov. Gavin Newsom last week also announced a Biden administration commitment to repairing and upgrading the water treatment plant.
• The mayors of Coronado and Imperial Beach rallied over Labor Day weekend, demanding state and federal attention on the problem.

Why it matters: Cross-border pollution at the county's southernmost beaches presents an ongoing environmental justice crisis that threatens public health and safety and the local economy.

What they're saying: "Securing emergency funding is crucial to rehabilitate and expand the plant in order to protect public health and the environment, and to stop the economic damage cross-border sewage flows have had on our communities for far too long," the lawmakers wrote.

Details: Congress previously allocated $300 million to plant improvements — the latest request is for an additional $310 million to increase the amount of wastewater the plant can treat.

Officials also learned this summer of an additional $150 million in deferred maintenance at the plant, just to keep it operating at its current capacity.