Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California
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Abstract
Cyanobacterial harmful algal blooms (CHABs) are a growing concern in freshwater environments. These blooms can lead to degraded water quality, ecosystem disruptions, and public health threats due to the production of potent cyanotoxins. The Sacramento–San Joaquin Delta (California, USA; the Delta) has experienced CHABs since 1999, including CHABs that produce cyanotoxins at concentrations exceeding recreational advisory threshold levels.
In response to the CHAB monitoring needs in the Delta, in 2024 a CHAB monitoring strategy for the Sacramento–San Joaquin Delta was released. The CHAB monitoring strategy recommended implementing a comprehensive monitoring program aligned with regional priorities, and this report responds directly to that recommendation. Building on the CHAB monitoring strategy, it describes three example monitoring designs that draw from past studies to address present needs. To develop designs, the report outlines key components and considerations for implementing a CHAB monitoring program in the Delta. It provides: background on monitoring and modeling approaches, an overview of current monitoring programs in the region, guidance for selecting monitoring locations, indicators, and sampling frequencies, and example designs to guide program planning and budgeting. The overarching goal of the report is to help agencies and stakeholders move from high-level recommendations to practical, actionable designs that are tailored to the Delta’s physical, anthropogenic, and ecological landscape.
Suggested Citation
Bouma-Gregson, K., Lucas, L., Jaegge, A., Avouris, D., Richardson, E.T., Zwart, J.A., Kraus, T.E., 2025, Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California: ESS Open Archive, preprint posted December 05, 2025, https://doi.org/10.22541/essoar.176495220.03206867/v1.
| Publication type | Preprint |
|---|---|
| Publication Subtype | Preprint |
| Title | Designs for cyanobacterial harmful algal bloom monitoring in the Sacramento–San Joaquin Delta, California |
| Series title | ESS Open Archive |
| DOI | 10.22541/essoar.176495220.03206867/v1 |
| Publication Date | December 05, 2025 |
| Year Published | 2025 |
| Language | English |
| Publisher | ESS Open Archive |
| Contributing office(s) | California Water Science Center |
| Description | 299 p. |