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Monitoring Frequencies. Initially, small and medium systems must collect home tap amples for lead and copper analysis every six months. Samples 'or other factors must be taken from within the distribution ystem every six months, and from entry points to the distribu- ion system every two weeks. Both the number of'sampling sites aid the frequency may be reduced if, for three years, the action evel is met or the system maintains optimal treatment. Water Treatment Requirements • Frequency of Sampling t4 Monitoring Home within at entry Period taps dist. to dist. Initial 6 mo. 6 mo. i .6 mo. After corrosions fi mo. 6 mo. 1 2 wk- treatment Reduced —Conditional #- 1 yr. 6 mo. 2 wk. —Final 3 yr. 3 yr. i 2 wk. Four types of action are required to remedy high lead/ opper levels. Once a system finds that more than 10 percent of all tap monitoring -isults exceed the action levels, the system must begin to carry out the first three ..ctions. O Corrosion control treatment. Depending on its size, a system may be required to first monitor as described above and/or recommend a corrosion control treatment to. the State. Upon the approval of the State, treatment is to be installed and demonstrated to be effective according to criteria set by the State. Treatment options are: pH and alkalinity adjustment, calcium adjust- ment, and silica or phosphate -based corrosion inhibition. 9 Source Water Treatment. Systems must first monitor their source water for the presence of lead/copper, and, if necessary, recommend a treatment to the State. Treatment options are: ion exchange, lime softening, reverse osmosis, and coagulation/filtx-ation. Once the State approves a treatment, systems will have 2 years to install it and 1 more year to conduct follow-up monitoring. If treatment is not required, or if the treated water does not exceed the maxi- mum lead/copper levels permitted by the State, source water monitoring will be synchronized with the system's other monitoring schedules. ® Public Education. Public education materials developed by EPA will inform customers about the health effects of lead, and explain what they can do at home to reduce their exposure. ate s5 ntem must begin delivering the materials within 60 days of the lead Compliance Deadlines action level exceedance. The materials include public NOTE: assumes action levels exceeded in initial monitoring service announcements to be submitted periodically to television and radio stations, and other pamphlets to be delivered directly to customers, newspapers, hospi- Large Medium Small tals, etc. Action >50K 3,300.50K 53,300 LF a system continues to exceed the lead action level after installing optimal corrosion control and source water treatment, the fourth action must be taken: O Lead Service Line Replacement. Lead service lines that contribute more than 0.015 mg/L to tap water lead levels must be replaced. A system must replace seven percent of its lead lines each year, and must replace all lines within 15 years. For More Information Call the Safe Drinking Water Hotline at:1-800-426.4791. Lead Copper pH alkalinity Calcium Conductivity Orthophosphate Silica Temperatcue Begin monitoring Jan92 I Ju192 Ju193 Complete treatment study Ju194. i Ju195 Ju196 (if required by State) Recommend treatment to State • study not required- N/A Jan93 Jan94 • study required- ' Ju194 Ju195 i Ju196 Complete treatment installation i i • study not required- N/A Ju196 i JaK • study required- Jan97 Jan98 ! Jams I Complete follow-up monitoring i • study not required- N/A Ju197 Jan99 • study required- Jan98 '. Jan99 Jan2000