Placentia Water Quality

Placentia 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 is blended at the Highland reservoir before being served to customers.

The District obtains the remainder of the water our customers need from the local wholesaler Municipal Water District of Orange County (MWDOC). MWDOC obtains water from the 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
the surface of the 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 Placentia consumer confidence report.

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


Placentia’s colorful history began in 1837 when the governor of Mexico granted the Rancho San Juan Cajon de Santa Ana to Juan Ontiveros. This land grant included the area that today comprises Placentia, Anaheim, Fullerton, and La Habra

Our first pioneer was Daniel Kraemer, who purchased 3900 acres in 1865. Three years later, William McFadden and his wife, Sarah Jane, acquired 100 additional acres in the area. Many other settlers arrived in the following years. Residents built churches and schools as the community slowly developed.

            The school district’s original name was the Cajon School District. In 1878, at the suggestion of Sarah Jane McFadden, the name was changed to the Placentia School District. Placentia is derived from a Latin word meaning “a pleasant place to live.” The city name came from that change.

Placentia was placed on the map in 1910 when A.S. Bradford persuaded the Santa Fe Railroad to re-route their track through this area, thus shortening the rail distance to Los Angeles. A station was built and packing houses were established for the town’s growing citrus industry. Mr. Bradford also laid out the main streets of the town and, in his honor, Bradford Avenue retains his name today.
Placentia’s climate and rich land attracted an ever-growing number of new residents. The area was well suited for raising citrus fruit, walnuts, avocados, and grapes. Placentia became the center of Valencia Orange Growing and Packing, and its 500 citizens voted to incorporate the City in 1926.

In 1960, Placentia’s population had reached only 5,000; however, a phenomenal growth period was just beginning. By 1970, the population had increased five-fold to nearly 25,000. Today, Placentia is still a fast-growing community with 45,000 residents, beautiful suburban homes, good schools, stately churches, and wholesome recreation.

We are not the only “Placentia” in the world. A check of the world atlas reveals a Placentia in Newfoundland. Placentia Point is a geographical feature on the coast of British Honduras. Hannibal, his army, and their warrior elephants camped in Placentia in Northern Italy before crossing the Alps.