75C - PH - RPT ON WATER QUALITY - Laserfiche WebLink

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r The focal point of the waaterquality report is a table that lists the results of year -round monitoring for more than 1247 constituents. Only the constituents that are found are listed in the water quality data tables. Bottled water is not covered In this report. Santa Ana metal I primary drinking water standards in 2013. By reading the table from left to right, you will learn the quantity of a constituent found in Santa Ana's water supply and how that compares with the al lowabie state and federal limits. You'll also learn the range and average of the constituent measured as well as its origin. The questions and answers starting on this page, numbers 9. through 7, will explain the important elements of the table. WATER SOURCE & COMPONENTS *0s L What are the sourcces of the water santa Ana rdetivers? The City of Santa Ana depends on two sources for the 125 billion gallons of water we supply each year -68 Percentage is groundwater and 32 percentage is imported water, purchased from the Metropolitan Water District of Southern California (MWD), Thegrourrdwater accumulates and is stored beneath the surface of theearth and then pumped to the surface by 20 Cityownad wells. M WD 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 M WD connections located in the city. Most of our customers receive a blending of the two sources, groundwater and imported water. For more details, seethe Water Quality Standards for each of these sources in the data that follow. We have listed groundwater and imported water in separate columns. 2. Wheat's in r„ y drinkidg wofoO Your tap water may contdn different types of chemicals (organic and Inorganic), microscopic organisms (e.g., bacteria, algae, viruses) and radioactive materials (radionuclides), manyof 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. 3. What are the rnaxianurn allowed fuveN far constituents in drinking water} Health agencies have maximum contaminant levels for constituents so that drinking water is safe and looks, Castes and smells goad. A few constituents have the letters "TT" in the MCL column because they do not have a numerical MCL Instead, they have certain treatment requirements that have to be met. One of the constituents, total chlorine residual, has an MRDL (maximum residual disinfection level) instead of an MCL. The MRDL Is the maximum level of a disinfectant added for water treatment that is allowed in water. While disinfectants are necessary to till harmful microbes, drinking water regulations protect against too much disinfectant being added. Another constltuant, turbidity, has a requirement that 95 percent of the measurements taken must be below a certain number. Turbidity is a measure of the cloudiness of Che water. We monitor It because it is a good indicator of the efficiency of the filtration system. IM WATER OUAI.ITY REPORT 1 *1 [17YA1 75C -21