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The Consumer Confidence Report(CCR) is an annual water quality report that helps you make informed choices about the water you drink. CCRS are designed to let you know what contaminants, if any, are in your drinking water and any possible health effects. You will also learn about where your water comes from, how it is treated and what it contains. The focal point of the CCR is a table that lists the results of year -round monitoring for more than 120 constituents. Included in the table is the quantity of each constituent found in Santa Ana's water supply and how that compares with the allowable state and federal limits as well as Its likely origin. Only the constituents that are found are listed in the data table. Bottled water is not covered in this report. The questions and answers starting on this page, numbers 1 through 7, will explain the important elements of the table. 1. What are the sources of the water Santa Ana delivers? The City of Santa Ana depends on two sources for the 12.5 billion gallons of water we supply each year: 72 percent is groundwater and 28 percent is imported water purchased from the Metropolitan Water District of Southern California (MWD). The groundwater accumulates and is stored beneath the surface of the earth and then pumped to the surface by 20 city -owned wells. MWD brings Colorado River water from Lake Havasu and runoff from the snow pack in the Sierra Nevada Range in Northern California. The water is then treated at either the Diemer Filtration Plant In Yorba Linda or the Weymouth Filtration Plant in LaVerne before it is delivered to Santa Ana. There are seven MWD connections located in the City. Most of our customers receive a blending of the two sources, groundwater and imported water. For more details, see the Water Quality Standards for each of these sources in the data that follow. We have listed groundwater and imported water in separate columns. 2. What's in my drinking water? Your tap water may contain different types of chemicals (organic and inorganic), microscopic organisms (e.g., bacteria, algae, viruses) and radioactive materials (radionuclides), many of which are naturally occurring. Health agencies require monitoring for these constituents, because at certain levels they could make a person sick. The column marked "Parameter" lists the constituents found in the water used by Santa Ana. Contlnvea on next page. on SANTA ANA WATER QUALITY REPORT _ EXHIBIT 5 75C -45