Unregulated Contaminant Monitoring Rule (UCMR)
&
CCR reporting requirement
The CCR Rule requires a system to provide in their CCR the average of any monitoring results
from the year and the range of detections for each detected unregulated contaminant for which
monitoring is required. Systems are required to report detects of unregulated contaminants only
in the year during which monitoring was conducted. Systems are encouraged to include a brief
explanation of the reasons for monitoring for unregulated contaminants.
EXAMPLE–Unregulated contaminants are those for which EPA has not established drinking
water standards. The purpose of unregulated contaminant monitoring is to assist EPA in
determining the occurrence of unregulated contaminants in drinking water and whether future
regulation is warranted.
Copy the following table onto a CCR to report average and range of contaminants
detected.
UCMR 2 List 1 Contaminants
Contaminants
Average for
Range of
Likely Source of Contamination
the year
detections
2 Priority Compounds (1 insecticide and 1 insecticide degradate), by EPA Method 527
Dimethoate
Insecticide used on cotton and other field
crops, orchard crops, vegetable crops, in
forestry, and for residential uses
Terbufos sulfone
Degradate of the parent compound, terbufos;
terbufos used for systemic control of soilborne insects and nematodes in fields of corn,
grain sorghum, and sugar beets
5 Flame Retardants, by EPA Method 527
2,2’,4,4’Flame retardants added to plastics (for
tetrabromodiphenyl
products such as computer monitors,
ether (BDE-47)
televisions, textiles, and plastic foams)
2,2’,4,4’,5Flame retardants added to plastics (for
pentabromodiphenyl
products such as computer monitors,
ether (BDE-99)
televisions, textiles, and plastic foams)
2,2’,4,4’,5,5’Flame retardants added to plastics (for
hexabromodiphenyl
products such as computer monitors,
ether (BDE-153)
televisions, textiles, and plastic foams)
2,2’,4,4’,6Flame retardants added to plastics (for
pentabromodiphenyl
products such as computer monitors,
ether (BDE-100)
televisions, textiles, and plastic foams)
2,2’,4,4’,5,5’Flame retardant additive; production of
hexabromobiphenyl
polybrominated biphenyls ended in 1976 in
(HBB)
U.S. after an incident of significant accidental
agricultural contamination in 1973
3 Explosives, by EPA Method 529
2,4,6-trinitrotoluene
Used as an explosive in bombs and grenades,
(TNT)
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 byproduct 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
1,3-dinitrobenzene
Hexahydro-1,3,5trinitro-1,3,5triazine (RDX)
UCMR 2 List 2 Contaminants
Contaminants
Acetochlor
Average for
Range of
Likely Source of Contamination
the year
detections
3 Acetanilide Parent Herbicides, by EPA Method 525.2
2.0 Used as an herbicide on corn
Alachlor
Widely used herbicide, primarily used in
the Midwest to control
annual grasses and broadleaf weeds on
crops such as corn, sorghum,
and soybeans
Metolachlor
Broad spectrum herbicide used for general
weed control in noncrop areas; widely used
on crops such as corn, cotton, peanuts, grass
for seed production, nurseries,
edgerows/fencerows, and landscape
plantings
6 Acetanilide Herbicide Degradates, by EPA Method 535
Acetochlor oxanilic acid
Degradation product of acetochlor
(OA)
Acetochlor oxanilic acid
(OA)
Degradation product of acetochlor
Alachlor ESA
Degradation product of alachlor
Alachlor OA
Degradation product of alachlor
Metolachlor ESA
Degradation product of metolachlor
Metolachlor OA
Degradation product of metolachlor
N-nitrosodiethylamine
(NDEA)
6 Nitrosamines, by EPA Method 521
Nitrosamines can form as intermediates and
byproducts in chemical synthesis and
N-nitrosodimethylamine
(NDMA)
N-nitroso-di-nbutylamine (NDBA)
N-nitroso-di-npropylamine (NDPA)
Nnitrosomethylethylamine
(NMEA)
N-nitrosopyrrolidine
(NPYR)
manufacture of rubber, leather, and lastics;
can form spontaneously by reaction of
precursor amines with nitrosating
agents (nitrate and related compounds), or
by action of nitratereducing bacteria. Foods
such as bacon and malt beverages can
contain nitrosamines; there is also evidence
that they form in the upper GI tract