2020 Water Utilities Consumer Confidence Report 2020 Water Utilities Consumer Confidence Report | Page 2

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Table A . Regulated Substances . These substances are regulated or are required to be monitored and were detected in Arlington tap water in 2020
Substance
Units
Avg .
Min .
Max .
MCL
MCLG
Possible Source
Atrazine
ppb
0.15
0.10
0.20
3
3
Runoff from use as a common herbicide and pesticide
Barium
ppm
0.043
0.043
0.043
2
2
Discharge from metal and chemical factories , well drilling operations
Cyanide
ppb
116
60.2
171
200
200
Discharge from metal and fertilizer factories
Bromate 1
ppb
< 5
< 5
< 5
10
10
Byproduct of drinking water disinfection
Fluoride
ppm
0.238
0.097
0.606
4
4
Water additive promoting strong teeth
Nickel
ppb
1.15
1.10
1.20
100
100
Discharge from metal factories and petroleum refining
Nitrate
ppm
0.371
0.124
0.770
10
10
Runoff from fertilizers or livestock feedlots
Nitrite
ppm
< 0.05
ND
0.09
1
1
Runoff from fertilizers or livestock feedlots
Chloramines 2
ppm
3.2
2.9
3.3
MRDL = 4 MRDLG = 4 Water additive used to control microbes
Di ( 2-ethylhexyl ) Phthalate ( DEHP ) ppb < 0.5 ND 0.5 6 0 Additive in plastics , used in food packaging
Total Trihalomethanes 2
ppb
10.4
9.1
11.9
80
NA
By-product of drinking water disinfection
Haloacetic Acids ( HAA5 ) 2
ppb
5.5
5.1
5.7
60
NA
By-product of drinking water disinfection
Level
Action Level
Range
Possible Source
Substance
Units Action
No . Sites >
90 th
% -tile Detected
Lead ( 2020 ) 3
ppb
AL = 15
1
1.203
ND-22.5
Corrosion of household plumbing systems
Copper ( 2020 ) 3
ppm
AL = 1.3
0
0.164
ND-0.353
Corrosion of household plumbing systems
Total Organic Carbon ( TOC )
Units
Avg .
Min .
Max .
Possible Source
PB Plant ( raw )
PB Plant ( drinking )
PB Removal ratio 4
ppm ppm ratio
4.7
2.6
1.3
3.9
2.0
1.0
6.2
2.9
1.7
( PB = Pierce-Burch Plant )
Naturally present in the environment
JK Plant ( raw )
JK Plant ( drinking )
JK Removal ratio 4
ppm ppm ratio
4.7
2.6
1.3
3.7
2.1
1.0
5.1
3.1
1.6
( JK = John F . Kubala Plant )
Naturally present in the environment
Radioactive Substances
PB Plant
2017
JK Plant
2018
MCL
MCLG
Possible Source
Radium 228
pCi / L
1.43
< 1.0
5
NA
Beta / Photon Emitters
pCi / L
4.8
4.5
50
NA
Decay of natural and man-made deposits .
Gross Alpha Particle Activity
pCi / L
< 2.0
< 3.0
15
NA
Microbiological contaminants - Tarrant Regional Water District analyzed all raw water sources for cryptosporidium and there were no detections of cryptosporidium for any month in 2020 . 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 Units Avg . Min . Max . MCL MCLG Possible Source
Highest Single Measurement
NTU
0.06
0.02
1.04
TT = 1.0
0
Soil runoff
% of samples less than 0.3 NTU
%
99.85
99.84
99.86
TT = 95 %
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Compliance is based on a calculated running annual average of the quarterly averages .
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Compliance is based on a calculated annual average of all samples at routine sites .
3
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 .
4
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 .
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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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Winners of the Value of Water Mini-Poster contest 2020