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Water: ucmr2

Methods and Contaminants for the Unregulated Contaminant Monitoring Rule 2 (UCMR 2)

Sampling for the second Unregulated Contaminant Monitoring Rule (UCMR 2) occurred from 2008-2010. UCMR 2 included monitoring for 25 chemical contaminants.

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UCMR 2 Contaminants and Corresponding Analytical Methods

Assessment Monitoring (List 1 Contaminants)

Contaminant CAS Registry Number1 Minimum Reporting Level Sampling Points2 Analytical Methods
Two Insecticides EPTDS EPA 527
Dimethoate 60-51-5 0.7 µg/L
Terbufos sulfone 56070-16-7 0.4 µg/L
Five Flame Retardants EPTDS EPA 527
2,2',4,4'-tetrabromodiphenyl ether (BDE-47) 5436-43-1 0.3 µg/L
2,2',4,4',5-pentabromodiphenyl ether (BDE-99) 60348-60-9 0.9 µg/L
2,2',4,4',5,5'-hexabromobiphenyl (HBB) 59080-40-9 0.7 µg/L
2,2',4,4',5,5'-hexabromodiphenyl ether (BDE-153) 68631-49-2 0.8 µg/L
2,2',4,4',6-pentabromodiphenyl ether (BDE-100) 189084-64-8 0.5 µg/L
Three Explosives EPTDS EPA 529
1,3-dinitrobenzene 99-65-0 0.8 µg/L
2,4,6-trinitrotoluene (TNT) 118-96-7 0.8 µg/L
Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) 121-82-4 1 µg/L

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Screening Survey List 2

Contaminant CAS Registry Number1 Minimum Reporting Level Sampling Points2 Analytical Methods
Three Parent Acetanilides EPTDS EPA 525.2 (PDF) (60 pp, 203 K)
Acetochlor 34256-82-1 2 µg/L
Alachlor 15972-60-8 2 µg/L
Metolachlor 51218-45-2 1 µg/L
Six Acetanilide Degradates EPTDS EPA 535
Acetochlor ethane sulfonic acid (ESA) 187022-11-3 1 µg/L
Acetochlor oxanilic acid (OA) 184992-44-4 2 µg/L
Alachlor ethane sulfonic acid (ESA) 142363-53-9 1 µg/L
Alachlor oxanilic acid (OA) 171262-17-2 2 µg/L
Metolachlor ethane sulfonic acid (ESA) 171118-09-5 1 µg/L
Metolachlor oxanilic acid (OA) 152019-73-3 2 µg/L
Six Nitrosamines EPTDS & DSMRT EPA 521
N-nitroso-diethylamine (NDEA) 55-18-5 0.005 µg/L
N-nitroso-dimethylamine (NDMA) 62-75-9 0.002 µg/L
N-nitroso-di-n-butylamine (NDBA) 924-16-3 0.004 µg/L
N-nitroso-di-n-propylamine (NDPA) 621-64-7 0.007 µg/L
N-nitroso-methylethylamine (NMEA) 10595-95-6 0.003 µg/L
N-nitroso-pyrrolidine (NPYR) 930-55-2 0.002 µg/L
Notes

1 Chemical Abstract Service (CAS) Registry Number

2 Sample Points

a. Entry points to the distribution system (EPTDS)
b. Distribution system maximum residence time (DSMRT)

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