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Laws & RegulationsRegulatory InformationSafe Drinking Water ActUnregulated Contaminant Monitoring Programucmr2Methods and Contaminants for the Unregulated Contaminant Monitoring Rule 2 (UCMR 2)
Laws & RegulationsRegulatory InformationSafe Drinking Water ActUnregulated Contaminant Monitoring Programucmr2Methods and Contaminants for the Unregulated Contaminant Monitoring Rule 2 (UCMR 2)Methods and Contaminants for the Unregulated Contaminant Monitoring Rule 2 (UCMR 2)
Unregulated Contaminant Monitoring Regulation 2 (UCMR 2) sampling will occur during 2008 - 2010. This monitoring cycle includes 25 unregulated contaminants and five associated analytical methods.
- Assessment Monitoring, List 1 - EPA Methods 527 and 529 measures 10 contaminants. Even though 527 and 529 are new methods, the analytical techniques employed are commonly used.
- Screening Survey, List 2 - EPA methods 521 and 535 measures 12 contaminants using analytical techniques not commonly used in drinking water analysis. EPA method 525.2 is used for the analysis of the three parent acetanilide compounds.
UCMR 2 Contaminants and Corresponding Analytical Methods
Assessment Monitoring List 1
| Contaminant | CAS Registry Number | Minimum Reporting Level | Analytical Methods |
|---|---|---|---|
| Dimethoate | 60-51-5 | 0.7 µg/L | EPA 527 |
| Terbufos sulfone | 56070-16-7 | 0.4 µg/L | EPA 527 |
| Five Flame Retardants | |||
| 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) | 5436-43-1 | 0.3 µg/L | EPA 527 |
| 2,2',4,4',5-pentabromodiphenyl ether (BDE-99) | 60348-60-9 | 0.9 µg/L | EPA 527 |
| 2,2',4,4',5,5'-hexabromobiphenyl (HBB) | 59080-40-9 | 0.7 µg/L | EPA 527 |
| 2,2',4,4',5,5'-hexabromodiphenyl ether (BDE-153) | 68631-49-2 | 0.8 µg/L | EPA 527 |
| 2,2',4,4',6-pentabromodiphenyl ether (BDE-100) | 189084-64-8 | 0.5 µg/L | EPA 527 |
| Three Explosives | |||
| 1,3-dinitrobenzene | 99-65-0 | 0.8 µg/L | EPA 529 |
| 2,4,6-trinitrotoluene (TNT) | 118-96-7 | 0.8 µg/L | EPA 529 |
| Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) | 121-82-4 | 1 µg/L | EPA 529 |
Screening Survey List 2
| Contaminant | CAS Registry Number | Minimum Reporting Level | Analytical Methods |
|---|---|---|---|
| Three Parent Acetanilides | |||
| Acetochlor | 34256-82-1 | 2 µg/L | EPA 525.2 |
| Alachlor | 15972-60-8 | 2 µg/L | EPA 525.2 |
| Metolachlor | 51218-45-2 | 1 µg/L | EPA 525.2 |
| Six Acetanilide Degradates | |||
| Acetochlor ethane sulfonic acid (ESA) | 187022-11-3 | 1 µg/L | EPA 535 |
| Acetochlor oxanilic acid (OA) | 184992-44-4 | 2 µg/L | EPA 535 |
| Alachlor ethane sulfonic acid (ESA) | 142363-53-9 | 1 µg/L | EPA 535 |
| Alachlor oxanilic acid (OA) | 171262-17-2 | 2 µg/L | EPA 535 |
| Metolachlor ethane sulfonic acid (ESA) | 171118-09-5 | 1 µg/L | EPA 535 |
| Metolachlor oxanilic acid (OA) | 152019-73-3 | 2 µg/L | EPA 535 |
| Six Nitrosamines | |||
| N-nitroso-diethylamine (NDEA) | 55-18-5 | 0.005 µg/L | EPA 521 |
| N-nitroso-dimethylamine (NDMA) | 62-75-9 | 0.002 µg/L | EPA 521 |
| N-nitroso-di-n-butylamine (NDBA) | 924-16-3 | 0.004 µg/L | EPA 521 |
| N-nitroso-di-n-propylamine (NDPA) | 621-64-7 | 0.007 µg/L | EPA 521 |
| N-nitroso-methylethylamine (NMEA) | 10595-95-6 | 0.003 µg/L | EPA 521 |
| N-nitroso-pyrrolidine (NPYR) | 930-55-2 | 0.002 µg/L | EPA 521 |
Links
- Laboratories - criteria for laboratories to participate in program and a list of approved laboratories
- Statistical Protocol for the Determination of the Single-Laboratory Lowest Concentration Minimum Reporting Level (LCMRL) and Validation of Laboratory Performance at or Below the Minimum Reporting Level (MRL) - a protocol for developing Lowest Concentration MRLs (LCMRLs) and deriving MRLs from the LCMRL; and a downloadable tool to calculate LCMRLs.