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MCLs, DLRs, and PHGs for Regulated Drinking Water Contaminants <br />(Units are in milligrams per liter (mg /L), unless otherwise noted.) <br />Last Update: September 23, 2015 <br />Copper and Lead, 22 CCR §64672.3 <br />Values referred to as MCLs for lead and copper are not actually MCLs; instead, they are <br />called Action Levels" under the lead and copper rule <br />Copper <br />1.3 <br />0.05 1 <br />0.3 <br />2008 <br />Lead <br />0.015 <br />0.005 <br />0.0002 <br />1 2009 <br />Radionuclides with MCLs in 22 CCR §64441 and §64443 — Radioactivity <br />(units are picocuries per liter (pCi /L), unless otherwise stated; n/a = not applicable] <br />Gross alpha particle activity- OEHHA <br />concluded in 2003 that a PHG was not <br />practical <br />15 <br />3 <br />none <br />n/a <br />Gross beta particle activity - OEHHA <br />concluded in 2003 that a PHG was not <br />practical <br />4 mrem /yr <br />4 <br />none <br />n/a <br />Radium -226 <br />1 <br />0.05 <br />2006 <br />Radium -228 <br />1 1 <br />1 0.019 <br />2006 <br />Radium - 226 + Radium -228 <br />5 <br />Strontium-90 <br />8 <br />2 <br />0.35 <br />2006 <br />Tritium <br />20,000 <br />1,000 <br />400 <br />2006 <br />Uranium <br />20 <br />1 <br />0.43 <br />2001 <br />Exhibit 3 <br />75C -14 <br />