United States
Environmental Protection
Agency
The Third Unregulated Contaminant Monitoring Rule (UCMR 3):
Data Summary, April 2016
EPA uses the Unregulated Contaminant Monitoring Rule (UCMR) program to collect data for contaminants
suspected to be present in drinking water, but that do not have health-based standards set under the Safe
Drinking Water Act (SDWA). Every five years EPA develops a new list of UCMR contaminants, largely based on
the Contaminant Candidate List (CCL). The SDWA Amendments of 1996 provide for:
• Monitoring no more than 30 contaminants per 5-year cycle
• Monitoring only a representative sample of public water systems serving less than or equal to 10,000
people
• Storing analytical results in a National Contaminant Occurrence Database (NCOD)
This dataset represents the tenth NCOD release of analytical results for UCMR 3. Updates will occur
approximately quarterly and additional reference material is available to assist with the assessment of the
UCMR 3 data.
• Visit EPA's UCMR 3 website for more information
• Find information regarding many of the UCMR 3 contaminants (including a description of their use) on
the CCL website
UCMR 3 Data Considerations
This dataset is not complete. UCMR 3 monitoring occurred through December 2015, and data are expected to
be reported to EPA through the summer of 2016. Data are added and possibly removed or updated over the
course of this reporting cycle. These results are subject to change following further review by the analytical
laboratory, the public water system, the State and EPA. If you wish to perform additional data analyses, EPA
suggests you import each field into your choice of software as text. Some of the IDs can be misinterpreted as
long integer field types when they actually contain alpha characters.
Data are presented as tab delimited text files, with field names included in the first row of each file and no text
qualifier:
• Method-specific text files (\JCMR3_MethodNumber.txt, example UCMR3_200_8 for EPA method 200.8)
• Text file containing Disinfectant residual type (UCMR3_DRT.txt)
• Text file containing the U.S. Postal Service Zip Code(s) for all areas served by a PWS
(UCMR3_ZipCodes.txt)
• Text file containing all UCMR 3 data to date (UCMR3_All.txt)
Samples collected at the maximum residence time in the distribution system (MR) are required to be analyzed
for metals (including chromium-6) and chlorate. Water systems monitoring for Method 300.1 (chlorate) report
disinfectant types. In addition to reporting occurrence data for UCMR 3 target analytes, EPA tasked its small-
system contract-support laboratories with reporting results for sec-butylbenzene, n-propylbenzene, tellurium,
germanium and manganese. These additional unregulated analytes are within the scope of the methods
already being performed for the UCMR analytes. Population categories are based on retail population as
indicated by the Safe Drinking Water Information System (Federal) (SDWIS/FED) as of December 31, 2010.
Office of Water (MS-140) EPA 815-S-16-002 April 2016
-------
UCMR 3 Data Field Names and Definitions
Field Name
PWSID
PWSName
Size
FacilitylD
FacilityName
FacilityWaterType
SamplePointID
SamplePointName
SamplePointType
Associated FacilitylD
AssociatedSamplePointID
Disinfectant Type
CollectionDate
SamplelD
Contaminant
MRL
Definition
Public Water System Identification Code, 9-character identification code (Begins with the standard 2-character postal
State abbreviation or Region code, and the remaining seven numbers are unique to each PWS in the state)
Name of the Public Water System (PWS)
Size category of the PWS for UCMR, based on retail population as of December 31, 2010: S (< 10,000), L (> 10,000)
Public Water System Facility Identification Code, 5-digit identification code
Name of the facility at the PWS
Source of water at the facility: SW (surface water), GW (ground water), GU (ground water under the direct influence
of surface water), MX (Any combination of: SW, GW and GU)
Identification code for each sample point location in the PWS
Name of the sample point for every sample point ID at a PWS
Sampling Point Type Code: EP (entry point to the distribution system), MR (distribution system at maximum
residence time)
The facility ID of the associated MR
The sample point ID of the associated MR
CLGA (Gaseous Chlorine), CLOF (Offsite Generated Hypochlorite, stored as liquid), CLON (Onsite Generated
Hypochlorite, no storage), CAGC (Chloramine, formed from gaseous chlorine), CAOF (Chloramine, formed from
offsite hypochlorite), CAON (Chloramine, formed from onsite hypochlorite), CLDO (Chlorine Dioxide), OZON (Ozone),
ULVL (Ultraviolet Light), OTHD (All other types of disinfectant), NODU (No Disinfectant Used)
Date of sample collection (month, day, year)
Identification code for each sample, as defined by the laboratory
Unregulated contaminant being analyzed in UCMR 3
Minimum Reporting Level defined by UCMR 3
UCMR 3, April 2016
Page 2 of 12
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Field Name Definition
MethodID
AnalyticalResultsSign
AnalyticalResultValue
SampleEventCode
MonitoringRequirement
Region
State
ZipCode
Identification code of the analytical method
Less than (<) the minimum reporting level (MRL) or equal to (=) a numeric value at or above the MRL
Numeric value of the analytical result, null values represent less than MRL
Identification code for each sample event. Includes sample event one (SE1), sample event two (SE2), sample event
three (SE3), and sample event four (SE4).
AM (Assessment Monitoring, List 1), SS (Screening Survey, List 2), PST (Pre-Screen Testing, List 3)
EPA Region (States): 1 (CT, ME, MA, NH, Rl, VT), 2 (NJ, NY, PR (Puerto Rico), VI (Virgin Islands)), 3 (DE, DC, MD, PA,
VA, WV), 4 (AL, FL, GA, KY, MS, NC, SC, TN), 5 (IL, IN, Ml, MN, OH, Wl), 6 (AR, LA, NM, OK, TX), 7 (IA, KS, MO, NE), 8
(CO, MT, ND, SD, UT, WY), 9 (AZ, CA, HI, NV, AS (American Samoa), GU (Guam), MP (Northern Marianas Islands),
(Navajo Nation)), 10 (AK, ID, OR, WA)
NN
State abbreviation
U.S. Postal Service zip code(s) for all areas being served water by a PWS
UCMR 3, April 2016
Page 3 of 12
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UCMR 3 Chemical Contaminants and Methods
Contaminant
1,2,3-trichloropropane
1,3-butadiene
Chloromethane
1,1-dichloroethane
Bromomethane
HCFC-22
Halon 1011
1,4-dioxane
Vanadium
Molybdenum
Cobalt
Strontium
Chromium
Chromium-6
Chlorate
PFOS
PFOA
PFNA
PFHxS
PFHpA
PFBS
173-estradiol
17a-ethynylestrad iol
Estriol
Equilin
Estrone
Testosterone
4-androstene-3,17-dione
Contaminant Full Name
1,2,3-trichloropropane
1,3-butadiene
methyl chloride
1,1-dichloroethane
methyl bromide
Chlorodifluoromethane
Bromochloromethane
1,4-dioxane
Vanadium
Molybdenum
Cobalt
Strontium
total chromium
chromium-6
Chlorate
perfluorooctanesulfonic acid
perfluorooctanoic acid
perfluorononanoic acid
perfluorohexanesulfonic acid
perfluoroheptanoic acid
perfluorobutanesulfonic acid
estradiol
ethinyl estradiol
16-a-hydroxyestradiol
Equilin
Estrone
testosterone
4-androstene-3,17-dione
CAS1 Number
96-18-4
106-99-0
74-87-3
75-34-3
74-83-9
75-45-6
74-97-5
123-91-1
7440-62-2
7439-98-7
7440-48-4
7440-24-6
N/A
18540-29-9
14866-68-3
1763-23-1
335-67-1
375-95-1
355-46-4
375-85-9
375-73-5
50-28-2
57-63-6
50-27-1
474-86-2
53-16-7
58-22-0
63-05-8
Method ID
524.3
524.3
524.3
524.3
524.3
524.3
524.3
522
200.8
200.8
200.8
200.8
200.8
218.7
300.1
537
537
537
537
537
537
539
539
539
539
539
539
539
Method Name
Volatile Organic Compounds
Volatile Organic Compounds
Volatile Organic Compounds
Volatile Organic Compounds
Volatile Organic Compounds
Volatile Organic Compounds
Volatile Organic Compounds
Synthetic Organic Compound
Metals
Metals
Metals
Metals
Metals
Chromium-6
Oxyhalide Anion
Perfluorinated Compounds
Perfluorinated Compounds
Perfluorinated Compounds
Perfluorinated Compounds
Perfluorinated Compounds
Perfluorinated Compounds
Hormones
Hormones
Hormones
Hormones
Hormones
Hormones
Hormones
Monitoring
Requirement
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
AM
SS
SS
SS
SS
SS
SS
SS
1Chemical Abstract Service
UCMR 3, April 2016
Page 4 of 12
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UCMR 3 Microbiological Contaminants and Methods
Contaminant
Enteroviruses
Enteroviruses
Noroviruses
Noroviruses
Noroviruses
Total conforms
E.coli
Enterococci
Aerobic spores
Somatic phage
Male specific phage
Method ID
EPA1615A
EPA1615B
EPA1615C
EPA1615D
EPA1615E
SM 9223B
SM 9223B
ASTM D6503-99
SM9218
EPA 1602
EPA 1602
Method Name Monitoring Requirement
Enterovirus cell culture
Enterovirus RT-qPCR
Norovirus genogroup I with RT-qPCR primer set A
Norovirus genogroup I with RT-qPCR primer set B
Noroviruses genogroup II
Colilert®
Colilert®
Enterolert®
Aerobic endospores
Bacteriophage
Bacteriophage
PST
PST
PST
PST
PST
PST
PST
PST
PST
PST
PST
UCMR 3, April 2016
Page 5 of 12
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UCMR 3 Reference Concentrations for Chemical Contaminants
Under the current cycle of the Unregulated Contaminant Monitoring Rule (UCMR 3) chemicals are being
studied at levels that are often significantly below those in prior UCMR cycles. Importantly, UCMR 3 minimum
reporting levels (MRLs) were established based on the capability of the analytical method, not based on a level
established as "significant" or "harmful." In fact, the UCMR 3 MRLs are often below current "health reference
levels" (to the extent that HRLs have been established).
Results of UCMR 3 measurements should be interpreted accordingly. The detection of a UCMR 3 contaminant
above the MRL does not represent cause for concern, in and of itself. Rather, the implications of the detection
should be judged considering health effects information (which is often still under development or being
refined for unregulated contaminants).
The intent of the following table is to identify draft UCMR reference concentrations, where possible, to
provide context around the detection of a particular UCMR contaminant above the MRL. The draft reference
concentration does not represent an "action level" (EPA requires no particular action1'2 based simply on the
fact that UCMR monitoring results exceed draft reference concentrations), nor should the draft reference
concentration be interpreted as any indication of an Agency intent to establish a future drinking water
regulation for the contaminant at this or any other level. Decisions as to whether or not to regulate the
contaminant in drinking water will continue to be made following the Agency's Regulatory Determination
process. Visit EPA's Regulatory Determination website for more information.
The following key principles guided the development of the table:
(1) The reference concentrations are based on publically-available health information found in the
following EPA resources: 2012 Drinking Water Standards and Health Advisories, the CCL 3 Contaminant
Information Sheets, the Human Health Benchmark for Pesticides (HHBPs), the Integrated Information
Risk System (IRIS), or the 2014 Preliminary Regulatory Determinations for Contaminants on CCL 3. The
primary/secondary sources of health information vary with respect to scientific rigor from health
assessment to single studies and are cited in the table.
(2) If health information was available from more than one of the EPA resources listed above, the most
recent health information was used for the draft reference concentrations.
(3) Where both cancer and non-cancer draft reference concentrations existed, the lower (more
conservative) of the two concentrations was used. For chemicals with reference concentrations based
on a cancer endpoint, the table presents a range of values associated with 10~6 to 10~4 cancer risk. For
chemicals with reference concentrations based on a non-cancer endpoint, the duration of exposure
(short-term, intermediate/long-term, chronic) of the toxicity factor (e.g. Reference Dose) used as the
basis for the reference concentration is shown.
Recognizing that additional health effects information will become available over time, EPA will periodically
update the following table. Those attempting to assess UCMR occurrence data are encouraged to visit EPA's
website for the most recent information.
1 Consumer Confidence Report (CCR) and Public Notification (PN) reporting requirements (see 40 CFR 141.153(d) and 141.207, respectively) apply
to public water systems; CCR requires particular reporting based on measurements relative to the UCMR method reporting limits (MRLs) defined in
40 CFR 141.40.
2States may establish requirements for drinking water contaminants not yet regulated by EPA, and those requirements may be based on State-
established levels that differ from EPA's reference concentrations. Public Water Systems are responsible for being aware of and complying with
their State's requirements, if any.
UCMR 3, April 2016 Page 6 of 12
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Contaminant
Cobalt1
Molybdenum2
Strontium3
Vanadium1'4
Chromium (Total)
Chromium-61
Chlorate
1,4-dioxane5
1,1-dichloroethane5
1,2,3-trichloropropane5'6'7
MRL
(H9/L)
1
1
0.3
0.2
0.2
0.03
20
0.07
0.03
0.03
Reference
Concentration
(H9/L)
70
40
1,500
21
100
NA
210
0.35 to 35
6.14 to 614
0.0004 to 0.04
Reference Concentration
based on a Cancer
Endpoint
(Y/N)
N
(intermediate exposure)
N
(chronic exposure)
N
(chronic exposure)
N
(intermediate exposure)
N
(chronic exposure)
-
N
(chronic exposure)
Y
Y
Y
EPA Reference(s)
CCL 3 Contaminant Information Sheets
2012 Edition of the Health Advisories Table
Federal Register Notice for the Preliminary
Regulatory Determinations for Contaminants on
CCL 3 Contaminant Information Sheets
The MCL for the National Primary Drinking Water
Regulation
-
CCL 3 Contaminant Information Sheets
2012 Edition of the Health Advisories Table
CCL 3 Contaminant Information Sheets
2009 IRIS Assessment
1 The contaminant is on the IRIS 2012 Agenda for either a new assessment or an updated assessment (Federal Register Notice May 7, 2012).
2 The 2012 Edition of the Health Advisories Table and the CCL 3 Contaminant Information Sheets (35 u.g/L) have slightly different numbers due to rounding.
3 The reference concentration has been updated based on the HRL cited in the preliminary regulatory determination for strontium [Docket No. EPA-HQ-OW-2012-0155].
4 The ATSDR, 1992 used for the CCL 3 Contaminant Information Sheets is no longer publically available and has been replaced by a new assessment (ATSDR, 2013).
The minimum risk level (RfD equivalent) was 0.003 mg/kg/day for minor renal effects in an animal study (ATSDR, 1992) compared to 0.01 mg/kg/day for lack of minor effects in
blood pressure, body weight, and hematological parameters in a human study with a 12 week exposure (ATSDR, 2013).
5 Reference Concentration range based on cancer risk of 10"6 to 10"4.
610'6 cancer risk < MRL < 10'4 cancer risk.
7 To derive the reference concentration, age dependent adjustment factors were applied to the IRIS oral slope factor of 30 per mg/kg-day (calculated using adult exposure data)
to address presumed early-life susceptibility for this chemical (per EPA's Guidelines for Carcinogen Risk Assessment).
UCMR 3, April 2016
Page 7 of 12
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Contaminant
1,3-butadiene5'6
HCFC-22
(chlorodifluoromethane) 8
Chloromethane
(methyl chloride)5
Halon 1011
(bromochloromethane)9
Bromomethane
(methyl bromide)
PFBS
PFHpA
PFHxS
PFNA
PFOS
PFOA
17a-ethynylestrad iol
(ethinyl estradiol)10
173-estradiol
(estradiol)5
MRL
(H9/L)
0.1
0.08
0.2
0.06
0.2
0.09
0.01
0.03
0.02
0.04
0.02
0.0009
0.0004
Reference
Concentration
(H9/L)
0.0103 to 1.03
NA
2.69 to 269
90
140
NA
NA
NA
NA
0.07
0.07
0.035
0.0009 to 0.09
Reference Concentration
based on a Cancer
Endpoint
(Y/N)
Y
-
Y
N
(chronic exposure)
N
(chronic exposure)
-
-
-
-
N
(chronic exposure)
N
(chronic exposure)
N
(chronic exposure)
Y
EPA Reference(s)
CCL 3 Contaminant Information Sheets
-
CCL 3 Contaminant Information Sheets
2012 Edition of the Health Advisories Table
Human Health Benchmark for Pesticides (HHBPs)
-
-
-
-
Health Advisory and Supporting Documentation
for PFOS
Health Advisory and Supporting Documentation
for PFOA
CCL 3 Contaminant Information Sheets
CCL 3 Contaminant Information Sheets
8 The CCL 3 Contaminant Information Sheets provide a reference level of 31.5 u.g/L; the number is based on a single LOAELfrom a 1983 study.
9 The 2012 Edition of the Health Advisories Table and the CCL 3 Contaminant Information Sheets (70 u.g/L) have slightly different numbers due to rounding.
10 This corrects the CCL 3 Contaminant Information Sheet (originally listed as 0.28 u.g/L).
UCMR 3, April 2016
Page 8 of 12
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Contaminant
Equilin
Estriol
(16-a-hydroxyestradiol)
Estrone
4-androstene-3,17-dione
Testosterone
MRL
(H9/L)
0.004
0.0008
0.002
0.0003
0.0001
Reference
Concentration
(H9/L)
0.35
0.35
0.35
NA
NA
Reference Concentration
based on a Cancer
Endpoint
(Y/N)
N
(chronic exposure)
N
(chronic exposure)
N
(chronic exposure)
-
-
EPA Reference(s)
CCL 3 Contaminant Information Sheets
CCL 3 Contaminant Information Sheets
CCL 3 Contaminant Information Sheets
-
-
UCMR 3, April 2016
Page 9 of 12
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Terms
a) UCMR Draft Reference Concentration = The reference concentrations are based on publically-available health information found in the
following EPA resources: 2012 Drinking Water Standards and Health Advisories, the CCL 3 Contaminant Information Sheets, the Human
Health Benchmark for Pesticides (HHBPs), or the 2014 Preliminary Regulatory Determinations for Contaminants on CCL 3. The
primary/secondary sources of health information vary with respect to scientific rigor from health assessment to single studies. Many of the
contaminants are currently under regulatory review or development and are subject to change as new health assessments are completed.
b) MRL = UCMR Minimum Reporting Level. [Note that the Agency for Toxic Substances & Disease Registry (ATSDR) uses the term "MRL" for a
different purpose (i.e., to describe "Minimal Risk Levels"). The UCMR term and the ATSDR term have no relationship to each other.]
c) HRLs = Health Reference Levels. HRLs are not final determinations about the level of a contaminant in drinking water that is necessary to
protect any particular population and are derived prior to development of a complete exposure assessment. HRLs are risk derived
concentrations against which to evaluate the occurrence data to determine if contaminants occur at levels of potential public health
concern.
d) MCL = Maximum Contaminant Level. The highest level of a contaminant allowed in drinking water. MCLs are enforceable standards.
e) Cancer Risk of 10"6 to 10"4 = the concentration of a contaminant in drinking water corresponding to an excess estimated lifetime cancer risk
of one-in-a-million (Ix 10"6) to one-in-ten-thousand (1 x 10"4). The 2012 Drinking Water Standards and Health Advisories provide the cancer
risk at 1 x 10"4. The CCL 3 Contaminant Information Sheets provide the cancer risk at Ix 10"6.
f) LOAEL = Lowest Observed Adverse Effect Level
g) NA= Not Available
h) Short-term = Typically refers to animal toxicological studies with an exposure duration of days to weeks.
i) Intermediate/Longer-term = Typically refers to animal toxicological studies with an exposure duration of weeks to months.
j) Chronic = Typically refers to animal toxicological studies with an exposure duration of months to years; representing a lifetime exposure in
humans.
References
2012 Drinking Water Standards and Health Advisories (http://www.epa.gov/sites/production/files/2015-09/documents/dwstandards2012.pdf)
CCL 3 Contaminant Information Sheets (http://www.epa.gov/sites/production/files/2014-05/documents/final-ccl-3-contaminant-information-sheets.pdf)
Human Health Benchmark for Pesticides (HHBPs) (http://iaspub.epa.gov/apex/pesticides/f?p=HHBP:home)
Announcement of Preliminary Regulatory Determinations for Contaminants on the Third Drinking Water Contaminant Candidate List
(https://www.federalregister.gov/articles/2014/10/20/2014-24582/announcement-of-preliminary-regulatory-determinations-for-contaminants-on-the-third-drinking-water)
Integrated Risk Information System (IRIS) (http://cfpub.epa.gov/ncea/iris2/atoz.cfm)
UCMR 3, April 2016 Page 10 of 12
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April 2016 UCMR 3 Data Summary for Chemical Contaminants
Contaminant
(ug/L)
Reference Total
Concentration number of
(ug/L) results
Number Number of
of results
results >Reference
% of total
results
>Reference
Total Number of
number of PWSswith
PWSswith results
Concentration Concentration results
Number of
PWSs with
results
>Reference
Concentration
% of PWSs
with results
>Reference
Concentration
1,2,3-trichloropropane
1,3-butadiene
Chloromethane
1,1-dichloroethane
Bromomethane
HCFC-22
Halon 1011
1,4-dioxane
Vanadium
Molybdenum
Cobalt
Strontium
Chromium
Chromium-6
Chlorate
PFOS
PFOA
PFNA
PFHxS
PFHpA
PFBS
l?p-estradiol
17a-ethynylestradiol
Estriol
Equilin
Estrone
Testosterone
4-androstene-3,17-dione
0.03
0.1
0.2
0.03
0.2
0.08
0.06
0.07
0.2
1
1
0.3
0.2
0.03
20
0.04
0.02
0.02
0.03
0.01
0.09
0.0004
0.0009
0.0008
0.004
0.002
0.0001
0.0003
0.0004 / 0.041
0.0103 /1.031
2.69/2691
6.14 /6141
140
NA
90
0.35 /351
21
40
70
1,500
100
NA
210
0.07
0.07
NA
NA
NA
NA
0.0009 / 0.091
0.035
0.35
0.35
0.35
NA
NA
35,931
35,931
35,929
35,929
35,930
35,931
35,930
35,856
61,483
61,490
61,484
61,419
61,414
61,392
61,298
36,149
36,148
36,150
36,149
36,150
36,150
11,322
11,323
11,323
11,323
11,323
11,322
11,323
249
1
273
821
114
813
632
4,145
36,974
24,950
822
61,271
31,159
46,411
33,733
285
354
19
204
231
18
3
4
2
0
0
65
95
249/i9ii
I/O1
18 /O1
I/O1
0
--
0
1,069 /O1
1,664
145
3
1,698
1
--
9,547
119
31
--
--
--
--
I/O1
0
0
0
0
--
--
0.7% / D.5%1
0.003% / 0%1
0.05% / 0%1
0.003% / 0%1
0%
--
0%
3% / 0%1
2.7%
0.2%
0.005%
2.8%
0.002%
--
15.6%
0.3%
0.09%
--
--
--
--
0.009% / 0%1
0%
0%
0%
0%
--
--
4,850
4,850
4,850
4,850
4,850
4,850
4,850
4,849
4,862
4,862
4,862
4,862
4,862
4,862
4,852
4,864
4,864
4,864
4,864
4,864
4,864
1,186
1,186
1,186
1,186
1,186
1,186
1,186
64
1
134
239
49
279
302
1,062
3,579
2,510
241
4,862
3,602
4,343
3,344
94
108
14
55
84
8
1
4
2
0
0
58
73
64 / 531
I/O1
7/01
I/O1
0
--
0
336/ O1
161
38
3
278
1
--
1,850
46
13
--
--
--
--
I/O1
0
0
0
0
--
--
1.3%/i.r/o1
0.02% / 0%1
0.1% /0%1
0.02% / 0%1
0%
--
0%
7% / 0%1
3.3%
0.8%
0.06%
5.7%
0.02%
--
38.1%
0.9%
0.3%
--
--
--
--
0.08% / 0%1
0%
0%
0%
0%
--
--
'Where two reference concentrations are listed, the first number is associated with a 106 cancer risk; the second number a 10"4 cancer risk.
Where two results are presented the first number is associated with the first reference concentration; the second number is associated with the second reference concentration.
UCMR 3, April 2016
Page 11 of 12
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April 2016 UCMR 3 Data Summary for Microbiological Contaminants
Contaminant
Total number Number of
of results results >MRL
Total number of Number of
PWSs with PWSs with
results results >MRL
M M
Aerobic spores
E. coli
Enterococci
Enteroviruses (cell culture)
Enteroviruses (RT-qPCR5)
Male specific phage
Noroviruses GIA8
Noroviruses GIB9
Noroviruses Gil10
Somatic phage
Total coliforms
1
M M
1
1
1
0.002
0.398
1
0.398
0.398
0.398
1
1
M M
SFOVlOO ml2
MPN3/100 ml
MPN/lOOmL
MPN/L4
GC6/L
PFU7/100 ml
GC/L
GC/L
GC/L
PFU/100 ml
MPN/lOOmL
M M
1,004
1,002
1,001
1,001
1,001
986
1,001
1,001
1,001
986
1,002
M M
304
3
41
2
6
14
4
2
4
5
55
M M
793
791
792
789
789
781
789
789
789
781
791
™
251
3
41
2
6
14
4
2
4
5
51
'SFO = Spore Forming Units
2ml_= milliliters
3MPN = Most Probable Number
4L= liters
5RT-qPCR= Reverse Transcription-Polymerase Chain Reaction
6GC = Genomic Copies
7PFU = Plaque Forming Units
8Noroviruses GIA = qPCR analysis of Norovirus genogroup I with RT-qPCR primer set A
'Noroviruses GIB = qPCR analysis of Norovirus genogroup I with RT-qPCR primer set B
"Noroviruses Gil = qPCR analysis of Norovirus genogroup II
UCMR 3 Minimum Reporting Levels for Microbiological Contaminants
Under UCMR 3 microbe analytical results are reported as "below", "at" or "above" MRL. UCMR 3 MRLs were established based on the capability of
the analytical method.
It is important to note that microbial contamination can be transient in nature and microbial detections under UCMR 3 should be interpreted in the
context of the time samples were collected. However, the presence of any UCMR 3 microbe indicates a potential vulnerability of the PWS to
contamination.
UCMR 3, April 2016
Page 12 of 12
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