Los Angeles Plain

The Burbank Water Reclamation Plant, which discharges into the LA River near Sepulveda Dam, is currently the only facility in the broader Los Angeles Plain watershed listed by EPA in Significant Non-Compliance. The flag here isn't a pollutant exceedance; it's administrative. The plant has failed to submit its required discharge monitoring reports, which is a different kind of problem, but not a minor one.The stretch matters as much as the paperwork. Reach 4 of the river, between Sepulveda Drive and Sepulveda Dam, is already on the state's impaired waters list and already has a completed cleanup plan attached to it. A monitoring gap on a segment that's supposed to be under closer regulatory watch, not less, means both regulators and the public temporarily lose visibility into whether that cleanup plan is actually working.A separate, odder pattern is showing up nearby. Streamflow gauges on the LA River at Sepulveda Dam, along with the Arroyo Seco and Big Tujunga Creek, have been running well below their own recent averages, with the latest reading at roughly a twentieth of the 30-day mean (based on a thin six-reading sample, so worth holding loosely). What makes it strange is timing: the US Drought Monitor has held Los Angeles County at zero percent drought coverage every week since late December, a sharp reversal from a year earlier, when nearly the entire county sat in severe drought.So the river is running low on paper-wet ground, not officially dry ground. In a heavily managed, dammed system like this one, summer flow answers to reservoir operations and diversions as much as to rainfall, and it doesn't track the county drought map in any simple way.

Dotted Paropsine Leaf Beetle (Paropsis atomaria), a small spotted leaf beetle from Australia, has been quietly spreading across the west side of the basin since late February. In just the past week alone, there have been five new sightings ranging from Kenneth Hahn State Recreation Area through Culver City and up toward UCLA — 67 records in total since the beetle first appeared. In its native range, this beetle feeds on eucalyptus foliage and can defoliate trees when populations build.The concern here is geography and history. Eucalyptus was planted by the millions across Los Angeles over the past century and a half, lining streets, filling parks, and covering hillsides from the coast to the foothills — creating a continuous, connected food source across an enormous urban canopy. A beetle that specializes on eucalyptus has essentially inherited an ideal landscape. Whether this establishes into something that those trees here will struggle with, or stays below the threshold of serious damage, remains an open question — one worth watching as summer peak activity continues.

Monarchs (Danaus plexippus) have been turning up across the basin nearly every day this month — from the beach towns along the coast through Culver City, Pasadena, and up into the San Gabriel foothills, with two sightings at Ballona Wetlands on a single day last week. July is the summer breeding generation, not the fall migration; these are butterflies searching out milkweed to complete one more reproductive cycle before the autumn push south toward Mexican overwintering sites.The western population crashed by roughly 99% by 2020, according to Xerces Society Thanksgiving Count data — a collapse driven by loss of milkweed across the landscape and pesticide use. Urban and suburban milkweed plantings across exactly this kind of fragmented, built-up terrain are considered a key factor in the species' prospects — a reminder that backyard conservation can matter at a continental scale. Yet not all milkweed is equal here. The tropical milkweed that lines many garden beds stays green year-round in the mild climate, which can cause monarchs to skip migration entirely and linger on plants that accumulate a protozoan parasite called Ophryocystis elektroscirrha. The sightings at Ballona are a reminder that even a heavily impaired urban estuary still draws this species — though what observation counts reflect about population status, observer effort, or habitat use is beyond what presence records alone can tell us.

July is the month when Ballona Creek — its estuary and wetlands — shows the full cost of being a federally impaired system. Low flows concentrate whatever water remains; heat strips away dissolved oxygen; and nineteen facilities currently operate in violation of their discharge permits. The creek's own recovery trajectory remains unclear, with six nearby waters still without finished remediation plans.Western sycamores stand in full summer leaf along the banks — their canopies now among the few buffers the system has left. They offer shade where the creek itself can no longer offer sanctuary. It is a portrait of ecological triage: what survives here does so partly because it has learned to live in a place that was never meant to be this compromised.

Elegant Terns have been sighted 14 times since April hunting these waters, dispersing north from Isla Rasa where nearly the entire global population nests. The birds follow fish migrations — a sensible ecology — but the fish themselves carry a hidden cost. The hunting grounds here have been formally listed as impaired for more than two decades, and no cleanup effort has been completed.This creates a direct pathway for contaminants to reach the colony. Elegant Terns are trophic foragers; they concentrate whatever toxins accumulate in the small fish they prey on. When they return to Isla Rasa to feed their chicks, those same contaminants arrive in the food the young birds consume. The colony's resilience depends entirely on the ocean remaining relatively clean—a condition that has not held for at least twenty years.