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