Yorba Linda Water Quality

Yorba Linda Water Quality Report


The water comes from both local and imported sources.  Local water comes from the District’s ten water wells.  These wells pump water from a large underground aquifer that underlies most of northern Orange County.  The District obtains approximately 70% of the water our customers need from the wells.

The remainder of the water either comes from the Colorado River via the Colorado River Aqueduct or the Sierra Nevada Mountains in northern California via the California Aqueduct. The District’s wells tap an underground aquifer that underlies most of northern Orange County. The aquifer is carefully managed by the Orange County Water District, and is replenished by water from the Santa Ana River, local rainfall, and surplus water purchased from imported sources.

The District’s groundwater sources are: Well No. 1, Well No. 5, Well No. 7, Well No. 10, Well No. 12, Well No. 18, and Well No. 19 are located within Placentia city limits; Well No. 11, Well No. 15, and Well No. 20 are located within Anaheim city limits. The water from these wells are blended at the Highland reservoir before being served to customers.

The District obtains the remainder of the water our customers need from local wholesaler Municipal Water District of Orange County (MWDOC). MWDOC obtains water from regional supplier Metropolitan Water District of Southern California (MWD). MWD obtains water from northern California via the California Aqueduct, and from the Colorado River via the Colorado River Aqueduct.

MWD owns and operates the Robert B. Diemer Water Treatment Plant located just north of western Yorba Linda where the water is treated to meet drinking water standards.


The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over the
surface of land or through the layers of the ground it dissolves naturally-occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animal and human activity.

Contaminants that may be present in source water include:

Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban stormwater runoff, and residential uses.

Microbial contaminants, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations and wildlife.

Radioactive contaminants, which can be naturally occurring or be the result of oil and gas production or mining activities.

Inorganic contaminants, such as salts and metals, which can be naturally occurring or result from urban storm runoff, industrial or domestic wastewater discharges, oil and gas production, mining and farming.

Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gasoline stations, urban stormwater runoff, agricultural application and septic systems


Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised people, such as those with cancer who are undergoing chemotherapy, persons who have had organ transplants, people with HIV/AIDS or other immune system disorders, some elderly persons and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers.

The USEPA and the federal Centers for Disease Control
guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from USEPA’s Safe Drinking Water Hotline at (800) 426-4791 between 10 a.m. and 4 p.m. Eastern Time (7 a.m. to 1 p.m. in California)- source: 2017 Whittier consumer confidence report.



Click here to find out the water quality of other cities in Southern California


Yorba Linda, known as the “Land of Gracious Living” is a city with a strong sense of community and small-town character. The “Yorba Linda” name originated from Jose Yorba, a member of a Spanish expedition. In 1907, portions of the former Yorba lands were sold to the Janss Corporation, who then subdivided the property and named the new town “Yorba Linda” (“Yorba” after the early land grant family and “Linda” meaning pretty in Spanish).

Early residents came to Yorba Linda with the intent of operating small farms, constructing numerous ranch houses, and planting citrus groves. The construction of the Pacific Electric Railroad line between Yorba Linda and Los Angeles established an important transportation link providing growers a more efficient means to deliver their produce to major markets. Soon after, two packing houses were built adjacent to the railroad station and the center of the community was established.

During the 1920s, Yorba Linda continued to grow and prosper with agriculture as the main industry of the local economy. Several new commercial structures were built on the town’s Main Street but the overall character of the community remained primarily agricultural. The Depression of the 1930s brought an economic slowdown to the city, but the local population remained stable and the agricultural economy continued to be productive. During the post-World War II era, the city retained its small-town character, and only experienced the tremendous population growth felt by other surrounding cities from the previous two decades in the 1960s.

Yorba Linda, once a small agricultural community of two-and-a-half square miles with approximately 1,198 residents, began its transformation into a modern community with its incorporation in 1967. During that decade, the population increased by 890%, reaching 11,856 in 1970, with the city adopting a General Plan for municipal development in 1972. Yorba Linda’s population of 28,254 in 1980 experienced a surge in 1990 with over 52,422 residents. Growth has slowed since, with just under 68,000 residing in the City.

Today, Yorba Linda comprised of 20 square miles, remains a suburban community characterized by mostly residential family neighborhoods, key commercial centers, parklands, and open space, multi-use trails, and important historic resources. Recognized as one of the “100 Best Places to Live” in the United States, Yorba Linda continues to uphold its shared values of responsible growth, preservation of existing neighborhood character, and conservation of natural resources.