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Approved Methods for Unregulated Contaminants
The 1996 Amendments to the Safe Drinking Water Act require monitoring for
certain contaminants to which maximum contaminant levels do not apply. On
September 17, 1999, EPA published final revisions to the Unregulated
Contaminant Monitoring Rule (UCMR). A Fact Sheet is
available that describes the major provisions of the rule. The rule was
supplemented on March 2, 2000, and again on January 11, 2001.
The UCMR Monitoring List includes thirty-five contaminants which were
identified as occurence priorities on the Contaminant Candidate
List, and two radionuclides that emerged during regulation
development. The UCMR Monitoring List is comprised of three separate lists
based on analytical methods readiness and current contaminant occurrence data:
List
1 for Assessment Monitoring, List 2
for Screening Survey and List 3
for Pre-Screen Testing.
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List 1 - Assessment Monitoring
List 1 includes twelve chemical contaminants for which analytical methods
exist or have recently been established. Monitoring of List 1 contaminants will
occur at large PWS and a representative sample of small PWS. |
| Contaminant |
EPA1 |
ASTM2 |
AOAC3 |
SM4 |
| 2,4-dinitrotoluene |
525.2 |
| 2,6-dinitrotoluene |
525.2 |
| Acetochlor |
525.2 |
| DCPA mono-acid degradate |
515.1, 515.2, 515.3, 515.4 |
D5317-93 |
992.32 |
| DCPA di-acid degradate |
515.1, 515.2, 515.3, 515.4 |
D5317-93 |
992.32 |
| 4,4'-DDE |
508, 508.1, 525.2 |
D5812-96 |
990.06 |
| EPTC |
507, 525.2 |
D5475-93 |
991.07 |
| Molinate |
507, 525.2 |
D5475-93 |
991.07 |
| MTBE |
502.2, 524.2 |
D5790-95 |
|
6200C, 6210D, 6200B |
| Nitrobenzene |
524.2 |
D5790-95 |
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6210D, 6200B |
| Perchlorate |
314.0 |
| Terbacil |
507, 525.2 |
D5475-93 |
991.07 |
| 1 |
The version of the EPA methods which you must follow for this Rule are
listed at §141.24(e). |
| 2 |
Annual Book of ASTM Standards, 1996 and 1998, Vol. 11.02, American
Society for Testing and Materials (ASTM) |
| 3 |
Official Methods of Analysis of AOAC (Association of Official Analytical
Chemist) International, 16th Edition, 4th Revision, 1998, Volume I, AOAC
International, First Union National Bank Lockbox, P.O. Box 75198, Baltimore, MD
21275-5198, Phone 800-379-2622. |
| 4 |
18th and 19th editions of Standard Methods
for the Examination of Water and Wastewater, 1992 and 1995, American Water
Works Association (AWWA).
SM6200B is only found in the 20th edition of Standard Methods for the
Examination of Water and Wastewater, 1998. |
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Screening Surveys for List 2
Contaminants
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Screening Survey - List 2 Chemical Contaminants
This includes contaminants for which analytical methods exist or have recently
been established. Monitoring of List 2 chemical contaminants will occur at
small PWS selected for the Screening Survey in 2001, and large PWS selected for
the Screening Survey in 2002. |
| Contaminant |
EPA Methods |
| 1,2-diphenylhydrazine |
526 |
| 2,4,6-trichlorophenol |
528 |
| 2,4-dichlorophenol |
528 |
| 2,4-dinitrophenol |
528 |
| 2-methyl-phenol |
528 |
| Alachlor ESA |
Being refineda |
| Diazinon |
526 |
| Disulfoton |
526 |
| Diuron |
532 |
| Fonofos |
526 |
| Linuron |
532 |
| Nitrobenzene |
526 |
| Prometon |
526 |
| RDX |
Being refineda |
| Terbufos |
526 |
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Screening Survey - List 2 Microbiological
Contaminant
Monitoring of the List 2 microbiological contaminant will occur at large and
small PWS selected for the Screening Survey in 2003. |
| Contaminant |
EPA Methods |
| Aeromonas |
1605 |
aCandidate for a 3rd Screening Survey, if conducted.
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List 3 - Pre-Screen Testing
List 3 contaminants have newly emerged as drinking water concerns and, in most
cases, only have methods in an early stage of development. Monitoring for List
3 contaminants will be performed only after future rulemaking specifies methods
to determine whether a listed contaminant occurs in sufficient frequency in the
most vulnerable systems or sampling locations to warrant its being included in
future Assessment Monitoring or Screening Surveys. |
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List 3 Chemical Contaminants
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| Contaminant |
Methods |
| Polonium-210 |
Reserved |
| Lead-210 |
Reserved |
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List 3 Microbiological Contaminants
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| Contaminant |
Methods |
| Cyanobacteria (blue-green algae, other freshwater algae and
their toxins) |
Reserved |
| Echoviruses |
Reserved |
| Coxsackieviruses |
Reserved |
| Helicobacter pylori |
Reserved |
| Microsporidia |
Reserved |
| Adenoviruses |
Reserved |
| Caliciviruses |
Reserved |
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