2019 Water Utilities Consumer Confidence Report 2019 Water Utilities Consumer Confidence Report | Page 2

Table A. Regulated Substances.
These substances are regulated or are required to be
monitored and were detected in Arlington tap water in 2019
Substance
Atrazine
Barium
Cyanide
Bromate 3
Fluoride
Nitrate as Nitrogen
Nitrite as Nitrogen
Chloramines 2
Total Trihalomethanes 2
Haloacetic Acids (HAA5) 2
Substance
Lead (2018)
Copper (2018) 1
1
Units Avg. Min. Max.
ppb
ppm
ppb
ppb
ppm
ppm
ppm
ppm
ppb
ppb 0.05
49.5
66.6
<5
0.54
0.450
<0.05
3.2
12.5
5.8 0.00
45.0
45.3
<5
0.225
0.26
ND
3
11.9
5.5 0.10
3
3
54.0
200
200
87.9
200
200
<5
10
10
0.809
4
4
0.834
10
10
0.1098
1
1
3.5
MRDL=4 MRDLG=4
12.9
80
NA
6.1
60
NA
Units
ppb
ppm
Total Organic Carbon (TOC ) Units
PB Plant (raw)
PB Plant (drinking)
PB Removal ratio 4
JK Plant (raw)
JK Plant (drinking)
JK Removal ratio 4
ppm
ppm
ratio
ppm
ppm
ratio
Action No. Sites >
Level Action Level
AL = 15
AL = 1.3
Avg.
5.1
2.5
1.4
4.9
2.5
1.4
Substance-Radioactive
Radium 228
Beta/Photon Emitters
Gross Alpha Particle Activity
pCi/L
pCi/L
pCi/L
0
0
Min.
Max.
4.5
6.2
2.3
2.9
1.2
1.7
4.0
5.7
2.1
2.9
1.0
1.7
PB Plant JK Plant
2017
2018
1.43
<1.0
4.8
4.5
<2.0
<3.0
MCL
MCLG
90
%-tile Range
2.62
0.203 ND-6.29
ND-0.294
MCL MCLG
Violation Possible Source
No
No
No
No
No
No
No
No
No
No
Runoff from herbicide used on row crops
Naturally present
Discharge from metal/plastic/fertilizer factories
Byproduct of drinking water disinfection
Highest Single Measurement
% of samples less than 0.3 NTU
Instead of MCLs for lead
and copper, EPA requires
that 90 percent of water
samples obtained from
customers’ taps contain
less than the Action Level
for each metal. Sampling
is required every 3 years.
2
Water additive promoting strong teeth
Runoff from fertilizers
Runoff from fertilizers
Water additive used to control microbes
3
By-product of drinking water chlorination
By-product of drinking water chlorination
th
Violation Possible Source
No
No
Corrosion of household plumbing systems
Violation Possible Source
(PB = Pierce-Burch Plant)
No
Naturally present in the environment
(JK = John F. Kubala Plant)
No
Naturally present in the environment
Violation Possible Source
5
50
15
NA
NA
NA
No
No
No
Decay of natural and man-made depos-
its. Testing for radiological substances
required every 3 years.
Units Avg. Min. Max. MCL MCLG
NTU
% 0.06
99.97 0.02
99.93 0.70
100% TT=1.0
TT=95% 0
0
Violation Possible Source
No
No
Soil runoff
Compliance is based on a
calculated annual average
of all samples at routine
sites.
Compliance is based on a
calculated running annual
average of the quarterly
averages.
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Corrosion of household plumbing systems
Microbiological contaminants In 2019, Tarrant Regional Water District analyzed all raw water sources for cryptosporidium and in January
2019, Lake Arlington was found to have 0.36 oocysts per liter. All other months in 2019 had no detections. Cryptosporidium is a pathogen
which may be found in water contaminated by feces. Although filtration removes cryptosporidium, it cannot guarantee 100% removal.
Turbidity for both Plants 5
1
5
Removal ratio is the percent
of TOC removed by the
treatment process divided
by the percent of TOC
required by TCEQ to be
removed. Compliance is
based on a running annual
average of ratios. If the
annual average removal
ratio is greater than or
equal to 1.0, the system is
in compliance.
Turbidity has no health
effects, however it can
interfere with disinfection
and provide a medium for
microbial growth. Turbidity
may indicate the presence
of disease-causing
organisms, including
bacteria, viruses and
parasites that can cause
symptoms such as nausea,
cramps, diarrhea and
associated headaches.
TABLE DEFINITIONS
Action Level (AL) The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must
follow. | < less than the amount listed. | ≥ equal to or greater than the amount listed. | Maximum Contaminant Level Goal (MCLG) The level
of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety. | Maximum
Contaminant Level (MCL) The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using
the best available treatment technology. | Maximum Residual Disinfectant Level Goal (MRDLG) The level of a drinking water disinfectant below
which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contamination.
| Maximum Residual Disinfectant Level (MRDL) The highest level of a disinfectant allowed in drinking water. There is convincing evidence that
addition of a disinfectant is necessary for control of microbial contaminants. | NA Not applicable | ND (Not Detected) No level of the parameter
was detected. | NE Not established | NTU (Nephelometric Turbidity Units) A unit used when measuring turbidity, a measure of the cloudiness of the
water. | pCi/L (picocuries per Liter) A measure of radioactivity in the water. | ppb (parts per billion, ug/L) A unit of measurement roughly equal to 1
drop in 100,000 gallons. | ppm (parts per million, mg/L) A unit of measurement roughly equal to 1 drop in 100 gallons. | TT (Treatment Technique)
A required process intended to reduce the level of a contaminant in drinking water. | Level 1 Assessment A study of the water system to identify
possible problems and determine (if possible) why total coliform bacteria were found. | Level 2 Assessment A very detailed study of the water system
to identify potential problems and determine (if possible) why an E. Coli Maximum Contaminant Level (MCL) violation has occurred and/or why total
coliform bacteria were found on multiple occasions. | Raw Water Water that has not yet been treated for consumption.
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