Anaheim Hills Water Quality

Anaheim Hills Water Quality Report


Anaheim hills water supply is a blend of groundwater from our wells and water imported from Northern California and the Colorado River by the Metropolitan Water District of Southern California (MWD). The source water for our wells is an aquifer that is replenished with water from the Santa Ana River, local runoff, imported water, and purified recycled water.
           Managed by the Orange County Water District (OCWD), the groundwater basin is 350 square miles in area and lies beneath most of northern and central Orange County. Anaheim and more than 20 cities and retail water districts pump from the groundwater basin to provide water to homes and businesses. Your water source depends on where you live or work within the boundaries of our community. Generally, the source of water for areas east and south of the 57 and 91 freeway interchange is imported water. The central and western portions of Anaheim mostly receive groundwater or a blend with imported supplies.

Groundwater Replenishment System

In an effort to create a more reliable and local resource, the city is participating in the Groundwater Replenishment System.
The Groundwater Replenishment System (GWRS) was constructed as a joint project of OCWD and the Orange County Sanitation District to recycle wastewater and provide a drought-proof source of water for our region.

The GWRS uses advanced treatment technologies to clean wastewater and then returns it to groundwater via recharge basins in Anaheim and direct injection near the coast. The water is further cleaned by layers of soil and rock and ultimately refills local water aquifers over time. It is important to remember that GWRS water does not go directly into your drinking water. Instead, it goes into the ground, where it will be naturally filtered by thousands of feet of soil and it will remain in the ground for years before it reaches drinking water well.

You can find additional information on the GWRS by visiting the website or by calling OCWD directly at 714-378-3333.



The sources of drinking water for Anaheim hills residents (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs and wells. As water travels over 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 Anaheim Water consumer confidence report.

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


Before the development, a few scattered low-density neighborhoods existed in the area including Peralta Hills and Mohler Loop (tracts which still exist today) that were developed primarily in the 1940s and 1950s. The remaining portions of Anaheim Hills were primarily developed in the 1970s after rancher and landowner Louis Nohl sold his massive parcel in the foothills east of Anaheim. The area was taken over by Texaco Industries in 1970 when the company announced plans to develop an expansive and upscale master-planned communities of 7,000 homes, estates, and townhomes. The original master plan included a proposal for three new lakes with high-density condominiums clustered around these water features. The initial master plan proved to be unsustainable due to the topography and geology of the area. Construction of the community began in 1971 and was branded as a rural enclave and alternative to the more dense subdivisions emerging in the Orange County basin with homes on large lots, hiking trails, a golf course, and low densities. Anaheim Hills is the first residential development to utilize “Landform Grading. “The community grew quickly and by 1974 the Orange Unified School District had constructed a high school to serve the growing community. In 1990, the city of Anaheim approved several large developments surrounding Weir Canyon Road (East Hills and The Highlands) expanding the community toward the 241 toll road. In 2007, the Irvine Company received approval for additional 2,500 homes just east of the 241-toll road on a parcel of land it has owned for over fifty years. However, in 2014 The Irvine Company donated the land for these additional 2,500 homes to the County of Orange to be preserved as open space.