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COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT <br />WATER QUALITY CONTROL COMMISSION <br />REGULATION NO. 41 <br />THE BASIC STANDARDS FOR GROUND WATER <br />ADOPTED: January 5, 1987 <br />EFFECTIVE: March 2, 1987 <br />AMENDED: August 7, 1989 <br />EFFECTIVE: September 30,1989 <br />AMENDED: September 11, 1990 <br />EFFECTIVE: October 30, 1990 <br />AMENDED: October 8, 1991 <br />EFFECTIVE: November 30, 1991 <br />AMENDED: December 6, 1993 <br />EFFECTIVE: January 31, 1994 <br />AMENDED: February 8, 1994 <br />EFFECTIVE: March 30, 1994 <br />AMENDED: January 10, 1995 <br />EFFECTIVE: March 2, 1995 <br />AMENDED: March 13, 1996 <br />EFFECTIVE: April 30, 1996 <br />AMENDED: January 13, 1997 <br />EFFECTIVE: March 3, 1997 <br />AMENDED: July 14, 1997 <br />EFFECTIVE: August 30, 1997 <br />AMENDED: January 11, 1999 <br />EFFECTIVE: March 2, 1999 <br />TRIENNIAL REVIEW: October 10, 2000 <br />AMENDED: November 13, 2001 <br />EFFECTIVE: December 30, 2001 <br />