Los Angeles Plain

Burbank Water Reclamation Plant is in significant non-compliance: the facility has not submitted its required discharge monitoring report. This is an administrative failure that prevents EPA oversight of the plant's actual discharges and compliance status.

Drought conditions began appearing in Los Angeles County as of October 13, with 6.67% of the county in D0 (Abnormally Dry) or worse. This marks a shift from drought-free conditions through early September and reflects the seasonal drying that precedes late autumn and winter precipitation.

Mean daily high at Los Angeles Downtown over the past 30 days was 88.3°F, 7.9°F above normal for this season. The warmest recorded day was 104°F on October 3. This sustained heat anomaly coincides with the region's fire season peak and compounds fire risk from fuel dryness through fall.

Mean daily high at Los Angeles Downtown USC station averaged 88.3°F over the past 30 days, 7.9°F above the 1991-2020 normal of 80.4°F. Sustained warmth through October is consistent with broader heat stress as the region transitions into autumn.

Common Green Darners (Anax junius) observed on 2026-10-11 near Compton and on 2026-10-10 near Carson are members of the second generation undergoing fall migration south. This migratory dragonfly emerges in northern waters in summer, and its offspring fly south from late August through October to reach Mexico and the Caribbean coast, where they breed before dying, while their offspring return north in spring.

The Los Angeles Plain ecosystem overlaps multiple EPA-designated impaired water bodies including Compton Creek, Ballona Creek, Rio Hondo, and Centinela Creek, all with established cleanup plans (TMDLs). These designations indicate the waters are failing to meet their designated uses, limiting freshwater aquatic habitat quality.

Abnormally dry conditions are affecting 6.67 percent of Los Angeles County as of the week of 2026-10-13 to 2026-10-19. This represents an expansion from early September when no drought was recorded, signaling emerging dry stress on freshwater ecosystems during the transition to fall.

Engelmann oak was recorded in Pasadena on 2026-10-19. This southern California native oak is federally threatened. The observation comes as temperatures in the region have been 7.9°F above normal for the past month and abnormal dryness has spread to 6.67% of Los Angeles County since late September, conditions that can stress oak survival.

Four Los Angeles River water body segments are listed as impaired under the Clean Water Act in the 2026 assessment cycle. Two reaches have completed TMDLs; one reach (Reach 2, from Carson to Figueroa Street) requires a TMDL and remains on the 303(d) list. TMDLs establish cleanup targets but do not guarantee improvement without implementation.

Seven federally protected species have ranges that may overlap the Los Angeles Plain, including three endangered species and one threatened species. These include Nevin's barberry, slender-horned spineflower, southwestern willow flycatcher, and coastal California gnatcatcher, along with proposed threatened species. IPaC screening indicates these species may be present; actual occurrence requires field verification.