The District's water is provided from local groundwater supplies and imported water from either the Colorado River and/or from Northern California. Our groundwater is pumped out of the Orange County Groundwater Basin, which is managed by the Orange County Water District (OCWD). Our imported water is supplied by Metropolitan Water District of Southern California (MWD). The drinking water we provide to homes, businesses, and schools is safe and meets all quality standards set by both the state and federal government. We continuously monitor the water supply and conduct hundreds of laboratory tests each year from water taken from sample points throughout the District's service area. The results of these tests are published in our annual Water Quality Report. 

What are PFOA, PFOS, AND PFAS?

Perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are chemicals that were commonly used to make carpets, clothing, fabrics for furniture, paper packaging for food and other materials that are resistant to water, grease or stains. They were also used for firefighting at airfields and in a number of industrial processes. Most people have been exposed to these chemicals through consumer products, but drinking water can be an additional source of exposure in communities where these chemicals have entered water supplies.

Between 2000 and 2002, PFOS was voluntarily phased out of production in the U.S. by its primary manufacturer. In 2006, eight major companies voluntarily agreed to phase out their global production of PFOA and PFOA-related chemicals, although there are a limited number of ongoing uses. Scientists have found PFOA and PFOS in the blood of nearly all the people they tested, but these studies show that the levels of PFOA and PFOS in blood have been decreasing.* PFOA and PFOS are two chemicals from a larger family of Per- and polyfluoroalkyl substances (PFAS). Newer PFAS compounds have been introduced by industry as replacements for PFOA and PFOS.*

*Source: EPA Drinking Water Health Advisories for PFOA and PFOS

How do PFOA and PFOS get into drinking water?

Due to the prolonged use of PFOA and PFOS in many common consumer products, the chemicals have been known to enter the water cycle through conventionally treated wastewater discharges from sewage treatment facilities, landfills and locations where the substances were used outdoors.

What is California continuing to do about PFAS?

In August 2019, the California State Water Resources Control Board - Division of Drinking Water (DDW) issued revised guidance on their previously established interim guidelines for the Notification Levels surrounding PFOA and PFOS. The new levels are 5.1 ppt and 6.5 ppt, respectively. Results above the Notification Level require agencies to notify the governing body for the areas where the water has been served within 30 days of receiving the verifying test results. The Response Level of 70 ppt for PFOA and PFOS remained the same. If the Response Level is exceeded in drinking water provided to consumers, DDW recommends that the water agency remove the water source from service or provide treatment.

DDW has also formally requested that the Office of Environmental Health Hazzard Assessment (OEHHA) develop a draft Public Health Goal (PHG), which is the first step in establishing a Maximum Contaminant Level for PFOA and PFOS.

How will I know if my water contains PFOA and/or PFOS?

Water agencies with monitoring results that indicate levels of PFOA and/or PFOS above the DDW Notification Level will be required to notify the governing body for the areas where the water has been served (i.e. City Council or County Board of Supervisors). DDW also recommends that agencies provide notifications to customers in the form of the annual Consumer Confidence Report required to be sent to each customer, website postings or bill inserts; however, these customer notifications are not mandated.

What are the health impacts of PFOA and PFOS?

Because these chemicals have been used in so many consumer products, most people have been exposed to them. While the production and use of these substances was phased out beginning in the early 2000s, the chemicals are highly persistent in the environment.

Animal toxicology and human epidemiological studies reported by EPA and Center for Disease Control indicate that exposure to these chemicals can cause increased cholesterol levels, a greater risk for thyroid disease and high blood pressure. The studies have also shown a decrease in response to vaccines, fertility rates in women, and infant birth weight.

What are the regulations that are currently in place for PFOA/PFOS in drinking water?

In summer 2018, the California State Water Resources Control Board - Division of Drinking Water (DDW) established Notification Levels and Response Levels for PFOA and PFOS. These Notification Levels were set at 4 parts per trillion (ppt) for PFOA and 4 ppt for PFOS. A “part-per-trillion,” or, one nanogram per liter, is the equivalent of four grains of sugar dissolved in an Olympic-sized swimming pool. The August 2019 DDW revised guidance set the Notification Levels for PFOA at 5.1 ppt and PFOS at 6.5 ppt. The state Notification Levels are based on the most sensitive known health endpoints for these compounds: lifetime cancer risk, liver toxicity, and immunotoxicity—in the case of PFOA and PFOS these standards are also the lowest level detectable through current testing means.

Notification Levels are precautionary health-based advisory levels established by DDW while further research and analysis are conducted by the state to determine the necessity of setting an enforceable drinking water maximum contaminant level (MCL). The state Notification Levels are based on the most sensitive known health endpoints for these compounds: lifetime cancer risk, liver toxicity, and immunotoxicity. An enforceable drinking water MCL can be promulgated by either the state or nationally by United States Environmental Protection Agency (USEPA) through deliberate processes prescribed in state and federal law.

The DDW Response Level is 70 ng/L for both PFOA and PFOS. If the testing exceeds this level, DDW recommends the source be taken out of service.

Who regulates drinking water in California?

The California Division of Drinking Water and United States Environmental Protections Agency (U.S. EPA) set standards and regulate drinking water in California.

How is the United States Environmental Protections Agency (US EPA) addressing PFAS, PFOA, and PFOS?

On May 19, 2016, the US EPA issued a new Health Advisory for lifetime exposure to PFOA and PFOS in drinking water set at a combined 70 parts per trillion. Based on preliminary information from EPA, 63 water suppliers in the United States detected PFOA and PFOS in their drinking water supplies. Twenty-six of these water systems are located in California.

Health advisories provide information about contaminants that can cause human health effects and are known or anticipated to occur in drinking water. EPA's health advisories are non-enforceable and non-regulatory and provide technical information to states agencies and other public health officials about health effects, analytical methodologies, and treatment technologies associated with drinking water contamination. EPA’s health advisory level for PFOA and PFOS offers a margin of protection for all Americans throughout their life from adverse health effects resulting from exposure to PFOA and PFOS in drinking water.*

*Source: EPA Drinking Water Health Advisories for PFOA and PFOS

Environmental Protection Agency PFOA/PFOS Fact Sheet.

Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. Every three years, the District tests for lead at-the-tap of 30 residences in our service area. The 30 homes we sample throughout the District are a representative sample of the homes that might have lead plumbing components. We do this according to the EPA's Lead and Copper Rule. The testing results are used to ensure corrosion control treatment techniques are working. If the water is soft or corrosive, it can accelerate the leaching of lead and other metals from household plumbing and water fixtures. 

Our 2014 tests did not detect any lead in any of the homes sampled. Tests for lead are done at the home because lead piping and solder was often used in older homes. Homes built prior to the 1930's had pipes primarily made of lead. After the 1930's and through the 1980's, copper pipes were often used however the solder to connect the pipes contained lead. Lead was a common component of solders used in plumbing until it was banned in 1991. 

Corrosive water, as it passed through the Flint water system, appears to have leached lead in service pipes as it reached the homes of some residents. Switching from one water source to another without implementing necessary treatment adjustments appears to be at the root of that community's challenge. The District has never used lead pipes to deliver water to our residents and our system is operated under optimized corrosion control to minimize lead leaching from plumbing materials in older homes.

The District receives majority of its water from the Metropolitan Water District of Southern California. Metropolitan has long imported two supplies, one from the Colorado River and the other from Northern California. Both are naturally low in corrosive qualities. But to ensure that the water that is delivered by the district is consistently so, measurements to monitor corrosion are among the 350-some constituents that are tested by Metropolitan more than 350,000 times a year at their five treatment plants. This means Southern California's drinking water receives almost 1,000 tests every single day. 

The District is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. If you are concerned about the possibility of lead leaching from your household pipes, you may wish to have it tested by a certified laboratory. The District can provide the contact information for the lab we use or residents can call the County Health Department for a list. Residents can also get information on lead in drinking water, testing methods, and steps to take to minimize exposure by calling the Safe Drinking Water Hotline at 800-426-4791 or by visiting the EPA website. All water agencies are required to produce a Water Quality Report that is mailed to customers in June. The report covers everything the District has tested for the previous year and the results.

Fluoride has been added to U.S. drinking water supplies since 1945. Of the 50 largest cities in the U.S., 43 fluoridate their drinking water. In December 2007, the Metropolitan Water District of Southern California joined a majority of the nation's public water supplies in adding fluoride to drinking water in order to prevent tooth decay. Metropolitan is the primary supplier of imported water to Laguna Beach and many Southland residents. 

In line with recommendations from the CDPH, as well as the U.S. Centers for Disease Control and Prevention, Metropolitan adjusted the natural fluoride level in imported treated water from the Colorado River and State Water Project water to the optimal range for dental health of 0.6 to 1.2 parts per million. Fluoride levels in drinking water are limited under California state regulations at a maximum dosage of 2 parts per million.

Is it harmful to my health?

Hundreds of studies have looked at whether there is a link between fluoride and cancer, as well as adverse effects on the immune system, kidneys, digestive, and reproductive system. In reviewing the body of evi­dence, the American Dental Association concluded that “the overwhelming...evidence indicates that fluoridation of community water supplies is both safe and effective.”

What if I do not want to drink fluoridated water?

Reverse osmosis or distillation home devices remove significant amounts of both naturally occurring fluoride and fluoride added through fluoridation. The National Sanitation Foundation (NSF) certifies certain reverse osmosis home treatment devices and distil­lation units for the reduction of fluoride. For a list of NSF certified devices, visit info.nsf.org/certified/DWTU. It is important to regularly maintain these devices for optimum effectiveness.

Additional Information

For more information about fluoride in drinking water visit:

• U.S. Center for Disease Control or 1-(888)-CDC-2306
• American Dental Association
• American Water Works Association
• National Cancer Institute