Appendix A-4: Federal Regulated Contaminants with No MCLs Background The 1996 Amendments to the Safe Drinking Water Act required the U.S. EPA to establish criteria for a monitoring program for unregulated contaminants and to publish a list of contaminants to be monitored. UCMR 1 (2001 2003 Monitoring) – In 1999, U.S. EPA revised the Unregulated Contaminant Monitoring Rule to incorporate a tiered monitoring approach. UCMR 1 had assessment monitoring (List 1) and screening survey (List 2) components. Assessment monitoring was conducted by large public water systems (PWS) serving more than 10,000 people and 800 representative small PWS serving 10,000 or fewer people for List 1 contaminants. Assessment monitoring was conducted by each PWS over a 12-month period between 2001 and 2003. Screening monitoring was conducted by a randomly selected set of 300 large and small PWSs for List 2 contaminants. Screening monitoring for chemical contaminants was conducted in 2001 and 2002 for small and large PWS, respectively. Screening monitoring for was Aeromonas conducted in 2003 for small and large PWS. UCMR 1 List 1 Assessment Monitoring List 2 Screening Survey – – 2,4-dinitrotoluene 1,2-diphenylhydrazine 2,6-dinitrotoluene 2-methyl-phenol Acetochlor 2,4-dichlorophenol DCPA mono-acid degradate 2,4-dinitrophenol DCPA di-acid degradate 2,4,6-trichlorophenol 4,4’-DDE Aeromonas EPTC Alachlor ESA Molinate Diazinon MTBE Disulfoton Nitrobenzene Diuron Perchlorate Fonofos Terbacil Linuron Nitrobenzene Prometon RDX Terbufos
Appendix A-4: Federal Regulated Contaminants with No MCLs Background The 1996 Amendments to the Safe Drinking Water Act required the U.S. EPA to establish criteria for a monitoring program for unregulated contaminants and to publish a list of contaminants to be monitored. UCMR 1 (2001 – 2003 Monitoring) In 1999, U.S. EPA revised the Unregulated Contaminant Monitoring Rule to incorporate a tiered monitoring approach. UCMR 1 had assessment monitoring (List 1) and screening survey (List 2) components. Assessment monitoring was conducted by large public water systems (PWS) serving more than 10,000 people and 800 representative small PWS serving 10,000 or fewer people for List 1 contaminants. Assessment monitoring was conducted by each PWS over a 12-month period between 2001 and 2003. Screening monitoring was conducted by a randomly selected set of 300 large and small PWSs for List 2 contaminants. Screening monitoring for chemical contaminants was conducted in 2001 and 2002 for small and large PWS, respectively. Screening monitoring for Aeromonas was conducted in 2003 for small and large PWS. UCMR 1 List 1 – Assessment Monitoring 2,4-dinitrotoluene 2,6-dinitrotoluene Acetochlor DCPA mono-acid degradate DCPA di-acid degradate 4,4’-DDE EPTC Molinate MTBE Nitrobenzene Perchlorate Terbacil List 2 – Screening Survey 1,2-diphenylhydrazine 2-methyl-phenol 2,4-dichlorophenol 2,4-dinitrophenol 2,4,6-trichlorophenol Aeromonas Alachlor ESA Diazinon Disulfoton Diuron Fonofos Linuron Nitrobenzene Prometon RDX Terbufos
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