Cypress Water Quality

Cypress Water Quality Report


The Metropolitan Water District of Southern California (MWD) is a consortium of 26 cities and water districts that provides drinking water to nearly 19 million people in Southern California, including West Basin Municipal Water District (WBMWD) from whom the City purchases treated water. MWD supplies the City with water treated at the F.E. Weymouth Treatment Plant. Most of the water treated at this plant travels down the Colorado River and flows through MWD’s 242-mile Colorado River Aqueduct. Some MWD water also comes from Northern California rivers and streams that feed the State Water Project’s 444-mile California Aqueduct.

The Weymouth plant uses conventional techniques to treat your water. This includes the coagulation process where aluminum sulfate and other chemical additives cling to particles in the water, forming large particles that settle to the bottom of large sedimentation basins. Then, the water flows through coal and sand for filtration. Chloramine (chlorine plus ammonia) disinfection is used to kill remaining microorganisms, such as bacteria, and to keep the water safe as it travels to your tap.

The Water Replenishment District of Southern California (WRD) manages groundwater for nearly 4 million residents in 43 cities of Southern Los Angeles County. There is one groundwater source well within the City, Well No. 5, with an approximate production capability of 1,500 gallons per minute (GPM). The City has adjudicated rights to 1,352 acre-feet of groundwater, annually. One acre-foot is enough water to cover an entire football field about one foot deep and provides the annual water needs for two average-sized households



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


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 Cypress Water consumer confidence report.

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


After World War II, many farmers were forced out of Long Beach, because a great number of GI’s wanted to live there; the farmers then relocated to Cypress. The Cypress School District had a summer playground program, an art teacher and a music teacher. In the late 1940s, Cypress was the third-largest dairy district in the United States. In 1944, the School District started the first kindergarten. Miss Dickerson was elected Superintendent of Schools. On August 3, 1947, Frank Vessels, Sr. held a race at his farm on Katella with 2,000 paid observers. They watched six races with purses of $50 and $100. Modern purses range as high as $250,000 on the same track. In 1949 the Cypress Recreation and Park District was formed. In the 1950s, Dairy City (Cypress), Dairyland (La Palma) and Dairy Valley (Cerritos) were known as Moo Valley. In 1952, the School District hired a full-time nurse. In 1956, the school district hired a psychologist and the population of the city was 1,616 people, 24,000 cows. On July 24, 1956, Cypress was incorporated and named Dairy City. The first City Council consisted of Alfred E. Arnold (Mayor Pro Tem), Walter J. Arrowood, Thomas A. Baroldi, Jacob Van Dyke, (Mayor) and Jacob Van Leeuweer, Jr.

Based on a straw vote of the residents on August 6, 1957, the City’s name was changed to “Cypress”. The ballot result was 208 votes in favor of “Cypress” and 41 votes against the change.