From information on pollution-tolerant algae compiled from reports from 165 authors, the genera and species most often referred to as significant fall into a relatively stable series. Diatoms, pigmented flagellates, green, and blue-green algae are all well represented among the pollution-tolerant genera and species. The top 8 genera are Euglena, Oscillatoria, Chlamydomonas, Scenedesmus, Chlorella, Nitzschia, Navicula, and Stigeoclonium, and the top 5 species, Euglena viridis, Nitzschia palea, Oscillatoria limosa, Scenedesmus quadricauda, and Oscillatoria tennis. In some genera, e.g., Euglena, a single species is far more significant than all others as a pollution-tolerant form. In other genera, e.g., Oscillatoria, only a slight difference distinguishes the pollution tolerance of 2 or more species. Algal genus and species pollution indices arc presented for use in rating water samples with high organic pollution.

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Although many of the streams in California have a high turbidity that would tend to keep the growth of algae to a minimum, the rapidly increasing numbers of impoundment and storage reservoirs, as well as irrigation ditches and open aqueducts, are providing environments for the abundant growth of both planktonic and attached algae. The article lists the different kinds of algae present in California water sources, along with reservoir problems, aquatic animals, physicochemical changes, tastes and odors, treatment plant problems, infestations in distribution systems, standards for high quality water, detection of plankton, algicides for reservoirs, activated carbon, selective draft, reservoir and canal covers, control of weeds, watershed control, control by filtration, control of organisms in distribution systems, and toxic algae.