Consumer Confidence Report Water Quality Report-2016-ENG | Page 2

Table A . Regulated Substances . These substances are regulated or are required to be monitored and were detected in Arlington tap water in 2016 . None of the detected substances exceeded the regulated limits .
Substance
Units
Avg .
Min .
Max .
MCL
MCLG
Possible Source
Atrazine
ppb
0.10
ND
0.19
3
3
Runoff from herbicide used on row crops
Barium
ppm
0.158
0.032
0.267
2
2
Naturally present
Antimony
ppb
0.27
ND
0.27
6
6
Discharge from petroleum sources
Arsenic
ppb
0.7
ND
0.7
10
10
Naturally present & runoff from herbicides
Chromium
ppb
1
ND
1
100
100
Naturally present & industrial sources
Cyanide
ppb
8
ND
8
200
200
Discharge from metal / plastic / fertilizer factories
Bromate 3
ppb
< 5
< 5
< 5
10
10
Byproduct of drinking water disinfection
Chloramines 2
ppm
3.5
3.4
3.6
MRDL = 4
MRDLG = 4
Water additive used to control microbes
Fluoride
ppm
0.57
0.47
0.8
4
4
Water additive promoting strong teeth
Nitrate as Nitrogen
ppm
0.765
0.21
1.940
10
10
Runoff from fertilizers
Nitrite as Nitrogen
ppm
0.055
ND
0.393
1
1
Runoff from fertilizers
Radioactive ( 2015 ) Radium 228
pCi / L
< 1.0
< 1.0
< 1.0
5
NA
Decay of natural and man-made deposits
Beta / Photon Emitters
pCi / L
< 4.0
< 4.0
< 4.0
50
NA
Decay of natural and man-made deposits
Gross Alpha Particle Activity
pCi / L
< 2.0
< 2.0
< 2.0
15
NA
Decay of natural and man-made deposits
Simazine
ppb
0.09
ND
0.09
4
4
Runoff from herbicide used on row crops
Total Coliform 4 , 7
%
NA
ND
1.00 %
5 %
NA
Naturally present in the environment
Total Organic Carbon ( TOC )
Naturally present in the environment
PB Plant ( raw )
ppm
5.5
4.7
6.4
( PB = Pierce-Burch Plant )
PB Plant ( drinking )
ppm
2.9
2.6
3.3
PB Removal ratio 5
remov . ratio
1.3
1.1
1.6
JK Plant ( raw )
ppm
5.2
4.2
6.3
( JK = John F . Kubala Plant )
JK Plant ( drinking )
ppm
2.5
1.9
2.9
JK Removal ratio 5
remov . ratio
1.5
1.1
1.7
Total Trihalomethanes 2
ppb
12.6
12.3
13.2
80
NA
By-product of drinking water chlorination
Haloacetic Acids ( HAA5 ) 2
ppb
7.7
6.7
9.2
60
NA
By-product of drinking water chlorination
Turbidity
Highest single measurement % of samples < 0.3 NTU
NTU %
0.08 99.9 %
0.03 99.9 %
0.34 100 %
TT = 1.0 TT = 95 %
0 NA
Soil runoff
Substance
Units
Action Level
No . Sites > Action Level
90 th
% -tile
Range
Possible Source
Lead ( 2015 ) 1
ppb
AL = 15
1
1.44
ND-46.8
Corrosion of household plumbing systems
Copper ( 2015 ) 1
ppm
AL = 1.3
0
0.166
ND-0.49
Corrosion of household plumbing systems
1
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
Compliance is based on a calculated annual average of all samples
at routine sites .
3
Compliance is based on a calculated running annual average of the quarterly averages .
4
Coliform bacteria are used as indicators of microbial contamination of drinking water because they are easily detected and found in the digestive tract of warm blooded animals . While not themselves disease producers , they are often found in association with other microbes that are capable of causing disease . Coliform bacteria are more hardy than many disease-causing organisms . Therefore their absence from water is a good indication that the water is bacteriologically safe for human consumption .
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 . Based on running annual average of ratios .
6
Turbidity has no health effects . However , turbidity 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 .
7
In 2016 , Tarrant Regional Water District analyzed all raw water sources for cryptosporidium and giardia each month . One of the samples , taken during 2016 contained 0.09 oocysts of cryptosporidium and two samples contained 0.17 and 0.09 organisms per liter for giardia . Cryptosporidium is a pathogen which may be found in water contaminated by feces . Although filtration removes cryptosporidium and giardia , it cannot guarantee 100 % removal .
Table Definitions
Action Level ( AL ) The concentratio which , if exceeded , triggers treat requirements which a water syst
< ( xxx ) less than the amount liste ≥ ( xxx ) equal to or greater than t
Maximum Contaminant Level Goa a contaminant in drinking water no known or expected risk to he margin of safety .
Maximum Contaminant Level ( MC a contaminant that is allowed in are set as close to the MCLGs as f available treatment technology .
Maximum Residual Disinfectant Le level of a drinking water disinfect is no known or expected risk to h reflect the benefits of the use of microbial contamination .
Maximum Residual Disinfectant Le level of a disinfectant allowed in is convincing evidence that addi necessary for control of microbia
NA Not applicable
ND ( Not Detected ) No level of the detected .
NE Not established
NTU ( Nephelometric Turbidity Uni measuring turbidity , a measure o water .
pCi / L ( picocuries per Liter ) A meas the water .
ppb ( parts per billion , ug / L ) A unit roughly equal to 1 drop in 100,00
ppm ( parts per million , mg / L ) A un roughly equal to 1 drop in 100 g
TT ( Treatment Technique ) A requir to reduce the level of a contamin