AEPA
United States
Environmental Protection
Agency
UCMR 2: Fact Sheet for Assessment
Monitoring of List 1 Contaminants
Title
Purpose
General
Description
Utilities
Covered
Unregulated Contaminant Monitoring Regulation (UCMR) for Public Water Systems (PWSs) Revisions
To collect occurrence 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. Assessment Monitoring targets contaminants that are analyzed with methods that utilize existing and widely used technology.
The UCMR monitoring program is the primary source of drinking water contaminant occurrence data used by EPA in regulatory determinations.
The second cycle of the revised UCMR (UCMR 2) includes Assessment Monitoring (List 1) for 10 contaminants using 2 analytical methods. PWSs
subject to Assessment Monitoring will sample within a twelve month period during 2008 - 2010. Monitoring results for PWSs serving over 10,000
people are reported to EPA's UCMR electronic data reporting system (i.e., the Safe Drinking Water Accession and Review System [SDWARS].)
Community water systems (CWSs) and non-transient non-community water systems (NTNCWSs) that serve a total population of more than 10,000
people and a representative sample of 800 systems serving 10,000 or fewer people are required to conduct Assessment Monitoring.

Contaminant and CAS1
Registry Number
MRL2
(Ug/L)
Use or Environmental Source
2 Priority Compounds (1 insecticide and 1 insecticide degradate
Dimethoate
60-51-5
Terbufos sulfone
56070-16-7
0.7
0.4
Insecticide used on cotton and other field crops, orchard
crops, vegetable crops, in forestry, and for residential uses
Degradate of the parent compound, terbufos; terbufos used
for systemic control of soil-borne insects and nematodes in
fields of corn, grain sorghum, and sugar beets
Health Effects3
bv EPA Method 527
EPA classified as a "possible human carcinogen," with
a reference does (RfD) of 0.0002 milligrams per
kilogram per day (mg/kg/day)
EPA derived chronic RfD of 0.00005 mg/kg/day for
the parent compound, based on no observed adverse
effect level for plasma cholinesterase inhibition
5 Flame Retardants, bv EPA Method 527
2,2',4,4'-tetrabromodiphenyl
ether (BDE-47)
5436-43-1
2,2',4,4',5-pentabromodiphenyl
ether (BDE-99)
60348-60-9
2,2',4,4',5,5'
ether(BDE-15
68631-49-2
hexabromodiphenyl
3)
2,2',4,4',6-pentabromodiphenyl
ether (BDE-100)
189084-64-8
2,2',4,4',5,5'
(HBB)
59080-40-9
hexabromobiphenyl
0.3
0.9
0.8
0.5
0.7
Flame retardants added to plastics (for products such as
computer monitors, televisions, textiles, and plastic foams)
Flame retardant additive; production of polybrominated
biphenyls ended in 1976 in U.S. after an incident of
significant accidental agricultural contamination in 1973
Animal studies suggest thyroid and liver effects, as well
as possible reduced immune system function and
neurobehavioral alteration
3 Explosives, bv EPA Method 529
2,4,6-trinitrotoluene (TNT)
118-96-7
,3-dinitro benzene
99-65-0
Hexahydro-l,3,5-trinitro-l,3,5-
triazine (RDX)
121-82-4
0.8
0.8
1.0
Used as an explosive in bombs and grenades, also used as a
propellant; small amounts used for industrial explosive
applications, such as deep well and underwater blasting;
chemical intermediate in manufacture of dyestuffs and
photographic chemicals
Used in explosives; also formed as a by-product during the
manufacture of the explosive TNT; used in the manufacture
of aramid fibers, spandex, and dyes
Used in detonators, primers, mines, rocket boosters, and
plastic explosives; used in fireworks and demolition blocks,
and as a rodenticide
EPA classified as possible human carcinogen (Group C)
based on urinary bladder papilloma and carcinoma in
female rats and activity in Salmonella, with and
without metabolic activation
EPA derived chronic oral RfD of 0.0001 mg/kg/day,
based on increased spleen weight
EPA derived chronic oral RfD of 0.0003 mg/kg/day,
based on prostate inflammation observed in rats in a 2-
year feeding study, and has classified RDX as a possible
human carcinogen (Group C), based on adenomas and
carcinomas in female mice
Chemical Abstracts Service
2 Minimum reporting level
3 Unregulated Contaminant Monitoring Regulation (UCMR) for Public Water Systems Revisions; Proposed Rule. Fed. Reg. Vol. 70, No. 161. p. 49093, August 22, 2005.

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Time frame
Frequency
Location
Laboratories
Monitoring
Groundwater
Surface Water or Groundwater Under the Direct Influence of Surface Water (GUDI)
One consecutive 12-month period during January 2008 - December 2010.
Monitoring will occur twice in a
consecutive 12-month period. Sample
events must occur 5 - 7 months apart.
Monitoring will occur in 4 consecutive quarters, with sampling events occurring 3 months apart.
Therefore, a system could conduct monitoring in either: (1) January, April, July, October; (2) February,
May, August, November; or (3) March, June, September, December.
EPA will assign a monitoring schedule; however, PWSs have the opportunity to change this schedule prior to the onset of monitoring.
Entry point to the distribution system.
Samples must be analyzed by EPA-approved laboratories. EPA-approved laboratories will be listed on the UCMR Web site at
http://www.epa.gov/safewater/ucmr/ucmr2/labs.html.
Critical Deadlines and Requiremer
Due Date
Requirement
its

Report through
SDWARS1
Contact UCMR
Sampling Coordinator2
Following Rule Publication
Within 90 days of
rule publication
Within 120 days of
rule publication
Within 210 days of
rule publication
Systems must submit contact information to SDWARS.
(Any subsequent changes must be submitted within 30 days of the change.)
Laboratories wanting to be approved must submit a registration form to
participate in the laboratory approval process. For more information see:
http://www.epa.gov/safewater/ucmr/ucmr2/labs.html.
Groundwater systems that wish to monitor from representative EPTDSs must
submit either approval documentation or proposed alternate sampling plan.
Deadline for systems to change their monitoring schedule (after 210 days systems
must provide an explanation for the requested schedule change).
PWSs review, and edit if necessary,
inventory information for sampling locations.
X


X
X

X
X
X (after 210 days)
X (after 210 days)
Following Sample Collection
Within 120 days of
sample collection
Within 60 days of
laboratory posting
of data
Laboratories post data to SDWARS.
PWSs review and approve the data. If after 60 days the PWS has not taken
action, the data are considered approved and ready for concurrent State and EPA
review.
X
X


1 Accessed through http://www.epa.gov/safewater/ucmr/ucmr2/reporting.html
2 Contact via e-mail at: UCMR_Sampling_Coordinator@epa.gov



UCMR 2 List 1 Data Elements
PWS Identification (PWSID)
PWS Facility Identification
Water Source Type
Sample Point Identification
Sample Point Type
Sample Collection Date
Sample Identification
Contaminant
Analytical Method
Sample Analysis Type
Analytical Result - Sign
Analytical Results - Value
Laboratory Identification
Sample Event

Consumer Confidence Report
Under the Consumer Confidence Report (CCR) Rule, as specified in 40
CFR 141.153(d), CWSs must report the monitoring results whenever
unregulated contaminants are detected. CCRs are to be sent to all
billing customers each year by July 1. (The CCR Rule does not apply to
non-community water systems.) Details on these reporting
requirements can be found on the CCR Home Page at:
http://www.epa.gov/safewater/ccr/index.html
               For More Information....
            Contact
 UCMR Message Center
 Safe Drinking Water Hotline
 CDX/SDWARS Help Desk
Telephone
                                        800 - 949 - 1581
                                        800 - 426 - 4791
                                           i-890-1995
                                           Public Notification Rule
The Public Notification Rule (40 CFR 141.207), published on May 4, 2000 (65 FR
25981), requires PWSs to notify the public annually that the results of monitoring for
unregulated contaminants are available (includes both CWSs and NTNCWSs). CWSs
may include their public notice within their CCRs. Details on these reporting
requirements can be found in the document: Public Notification Handbook (EPA 816-
R-00-010), available on EPA's Web site at:
http://www.epa.gov/safewater/pws/pn/handbook.pdf.
Office of Water
                 EPA 815-F-06-005
                                                      December 2006

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