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2. Contaminant Exceeds the Response Level • Recommended by DDW to reduce to below Response Level or take source out of use. • Recommended by DDW that if source remains in service to notify governing body and consumers (including renters, workers, and students) and the reason why it's still in service. Notification by water bill inserts, posted notices, hand-delivered notices, and press releases is recommended. • Recommended by DDW that monthly sampling/analysis occur, and quarterly notification of customers continue (using methods above) as long as Response Level is exceeded. • Should the water system refuse to provide additional consumer notification, DDW may provide that notification. On July 31, 2019, Assembly Bill No. 756 was signed, which supersedes the above and effective January 1, 2020 requires by law the following items specific to the unregulated contaminants PFOA and PFOS: 1. Any confirmed detection of PFOA or PFOS shall be included in the CCR. 2. Any confirmed detection of PFOA and PFOS above Response Level requires treatment to reduce below Response Level or requires taking sources out of use within 30 days. In conversations with DDW, they have clarified that taking sources out of use means making a well inactive or standby. Standby sources can only be used for short-term emergencies of five consecutive days or less, and less than a total of 15 calendar days a year. 3. If PFOA and PFOS is above Response Level and source is not taken out of use, then public notification shall be provided within 30 days as follows: • Mail or direct notice to each customer receiving a bill • Email notice to each customer where email address is known • Post notice on website • Use one or more methods to reach persons not likely to be reached by notices (i.e. newspapers, newsletters, social media, etc.) DISCUSSION PFOA and PFOS are human-made substances that are part of a larger group of chemicals referred to as per- and polyfluoroalkyl substances (PFAS). PFAS have been used extensively in surface coating protectant formulations due to their unique ability to repel oil, grease, and water. Major applications have included protectants for paper/cardboard packaging, carpets, leather products, and textiles, nonstick coatings on cookware, and in firefighting foams. PFOA and PFOS have been phased out of production by manufacturers in the United States; however, replacement substances have been developed within the PFAS family that appear to behave in a similar toxicological manner. The United States Environmental Protection Agency (US EPA) has issued regulations requiring manufacturers to notify US EPA of new uses of these chemicals to provide the US EPA opportunity to review and place limits, if necessary. Exposure to unsafe levels of PFOA and PFOS may result in adverse health effects including developmental effects to fetuses during pregnancy, cancer, liver effects, Page 6 of 13