Westminster Water Quality

Westminster Water Quality Report


The City of Westminster’s water supply is a blend of groundwater managed by the Orange County Water District (OCWD) and water imported from Northern California and the Colorado River. Imported water is purchased from MWDSC by the Municipal Water District of Orange County (MWDOC), which distributes it to water agencies in Orange County. Groundwater comes from a natural underground aquifer that is replenished with water from the Santa Ana River, local rainfall, and imported water. The groundwater basin is 350 square miles and lies beneath north and central Orange County from Irvine to the Los Angeles
border, and from Yorba Linda to the Pacific Ocean. Westminster has 10 groundwater wells located throughout the City and three import water connections. On average, 75% of our drinking water is produced from our groundwater wells and 25% is imported.



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: 2019 Westminster Water consumer confidence report.


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


The suburban residential tracts developed in Westminster in the 1920s-1950s are still a prominent fixture of the community’s urban fabric as the majority of the City’s acres support residential uses. In 1924 the Midway City subdivision began construction, followed shortly by Barber City in 1927. During the 1920s, the world’s largest goldfish farm moved into the area where the Westminster Mall stands today. Despite the growth of the community in the 1920s, the Great Depression stifled growth for much of the 1930s. In addition to the economic strains of the Depression, natural disasters including a major earthquake in 1933 and a severe flood in 1938 held Westminster back from embracing the development the city experienced in its early years.

Despite its stagnant growth in the early 1900s, by the 1940s and 1950s, the nationwide war and post-war boom brought exponential population growth to most areas throughout Southern California, especially those communities with access to jobs near the ports and aeronautic facilities. Following the war, servicemen who were located in Southern California decided to stay for the warm climate, and many large housing tracts grew around the agricultural lands of Westminster. The City’s population nearly quadrupled during this time from 2,500 in 1942 to nearly 10,800 in 1956.

In 1957, proceedings began to form a municipality called Tri-City, in a proposal to combine three communities into one: Westminster, Barber City, and Midway City. Before the vote, Midway City withdrew from the venture and remains unincorporated today. The proposal to incorporate Westminster and Barber City was approved by a vote of 1,096 to 1,008, and Westminster became California’s 337th city in 1957.

By 1963, the Orange County population had surpassed one million, like tourism, manufacturing and the service industries took over local economies once Disneyland opened its gates in 1955. During the 1960s, Westminster’s population exploded, more than doubling in a single decade from 25,000 at the beginning of the 1960s to 60,000 by 1970. As a result, the majority of the City’s residential neighborhoods were built during this time. Westminster continued to thrive throughout the 1960s and 1970s, especially after the Southland Freeway (I-405) system was completed and the Westminster Mall was constructed, the latter of which became a regional attraction that continues to be the City’s primary sales tax generator. As commerce and tourism continued to develop throughout the city and county, municipal construction projects in Westminster—including a new administration building, senior citizens facility, fire department buildings, and a renovation of the civic auditorium—demonstrated the prosperity of the time. By the end of the 1970s, very little vacant land remained in Westminster, and some of the community’s older buildings had already reached the end of their useful life and were redeveloped.