AWWA JAW10142

This article reports on physiochemical and microbiological analyses performed on influent and effluent samples taken from Garvey Reservoir in Los Angeles County, California. Interactions between measured parameters such as particle counts and size distributions, total plate count, coliform bacteria, algal counts, chlorophyll, turbidity, copper, and iron were investigated and analyzed with a computerized statistical package to determine significant relationships reflecting or possibly influencing the water quality of the reservoir. The quality of the influent was degraded through biological activity in the reservoir to produce a lower-quality effluent. Results indicate that algae are associated with increased turbidity and particulate levels and might enhance or support bacterial activity, including physical protection of bacteria against the effects of chlorination. Includes 30 references, tables, figure.