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Water: Unregulated Contaminant Monitoring Rule 3

Methods and Contaminants for the Unregulated Contaminant Monitoring Rule 3 (UCMR 3)

Sampling for the third Unregulated Contaminant Monitoring Rule (UCMR 3) will occur during 2013-2015. UCMR 3 includes monitoring for 30 contaminants (28 chemicals and 2 viruses).

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UCMR 3 Contaminants and Corresponding Analytical Methods

Assessment Monitoring (List 1 Contaminants)

Contaminant CAS Registry Number1 Minimum Reporting Level Sampling Points2 Analytical Methods Exit EPA Disclaimer
Seven Volatile Organic Compounds EPTDS EPA 524.3
1,2,3-trichloropropane 96-18-4 0.03 µg/L
1,3-butadiene 106-99-0 0.1 µg/L
chloromethane (methyl chloride) 74-87-3 0.2 µg/L
1,1-dichloroethane 75-34-3 0.03 µg/L
bromomethane (methyl bromide) 74-83-9 0.2 µg/L
chlorodifluoromethane (HCFC-22) 75-45-6 0.08 µg/L
bromochloromethane (halon 1011) 74-97-5 0.06 µg/L
One Synthetic Organic Compounds EPTDS EPA 522
1,4-dioxane 123-91-1 0.07 µg/L
Six Metals EPTDS & DSMRT EPA 200.8 Rev 5.4, ASTM D5673-10, Standard Methods 3125 (1997) (excluding chromium-6)
vanadium 7440-62-2 0.2 µg/L
molybdenum 7439-98-7 1 µg/L
cobalt 7440-48-4 1µg/L
strontium 7440-24-6 0.3 µg/L
chromium3 N/A4 0.2 µg/L
chromium-6 18540-29-9 0.03 µg/L EPA 218.7
One Oxyhalide Anion EPTDS & DSMRT EPA 300.1, ASTM D6581-08, Standard Methods 4110D (1997)
chlorate 14866-68-3 20µg/L
Six Perfluorinated Compounds EPTDS EPA 537 Rev 1.1
perfluorooctanesulfonic acid (PFOS) 1763-23-1 0.04 µg/L
perfluorooctanoic acid (PFOA) 335-67-1 0.02 µg/L
perfluorononanoic acid (PFNA) 375-95-1 0.02 µg/L
perfluorohexanesulfonic acid (PFHxS) 355-46-4 0.03 µg/L
perfluoroheptanoic acid (PFHpA) 375-85-9 0.01 µg/L
perfluorobutanesulfonic acid (PFBS) 375-73-5 0.09 µg/L

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Screening Survey (List 2 Contaminants)

Contaminant CAS Registry Number1 Minimum Reporting Level Sampling Points2 Analytical Methods
Seven Hormones EPTDS EPA 539
17-β-estradiol 50-28-2 0.0004 µg/L
17-α-ethynylestradiol (ethinyl estradiol) 57-63-6 0.0009 µg/L
16-α-hydroxyestradiol (estriol) 50-27-1 0.0008 µg/L
equilin 474-86-2 0.004 µg/L
estrone 53-16-7 0.002 µg/L
testosterone 58-22-0 0.0001 µg/L
4-androstene-3,17-dione 63-05-8 0.0003 µg/L

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Pre-Screen Testing (List 3 Contaminants)

Contaminant CAS Registry Number1 Minimum Reporting Level Sampling Points2 Analytical Methods
Two Viruses EPTDS EPA 1615
enteroviruses N/A4 N/A
noroviruses N/A N/A
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)

3 Monitoring for total chromium – in conjunction with UCMR 3 Assessment Monitoring – is required under the authority provided in Section 1445(a)(1)(A) of SDWA

4 Not Applicable

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