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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 Download
1605 in PDF
format. |
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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