2018 Water Utilities Consumer Confidence Report 2018 Water Utilities Consumer Confidence Report | страница 2

Table A. Regulated Substances.
These substances are regulated or are required to be
monitored and were detected in Arlington tap water in 2018
Substance
Units Avg. Min. Max. MCL MCLG Atrazine ppb 0.20 0.20 0.20 3 3 No Runoff from herbicide used on row crops
Barium ppm 0.053 0.048 0.058 2 2 No Naturally present
ppb 26.9 26.9 26.9 200 200 No Discharge from metal/plastic/fertilizer factories
ppb <5 <5 <5 10 10 No Byproduct of drinking water disinfection
Cyanide
Bromate
3
Chloramines
ppm 3.8 3.7 3.8 No Water additive used to control microbes
Fluoride ppm 0.598 0.227 0.867 4 4 No Water additive promoting strong teeth
Nitrate as Nitrogen ppm 0.447 0.151 0.829 10 10 No Runoff from fertilizers
Nitrite as Nitrogen ppm <0.05 ND 0.133 1 1 No Runoff from fertilizers
PB Plant (raw) ppm 5.1 4.7 6.0 PB Plant (drinking) ppm 2.8 2.5 2.9 PB Removal ratio 4 % 1.3% 1.1% 1.5% JK Plant (raw) ppm 4.7 4.1 5.6 JK Plant (drinking) ppm 2.7 2.4 3.0 % 1.2% .09% 1.4% ppb 10.1 8 11.2 80 NA No By-product of drinking water chlorination
ppb 7.8 4.7 12.9 60 NA No By-product of drinking water chlorination
2
MRDL=4 MRDLG=4
Violation Possible Source
Total Organic Carbon (TOC)
JK Removal ratio 4
Total Trihalomethanes
2
Haloacetic Acids (HAA5)
2
Naturally present in the environment
(JK = John F. Kubala Plant)
Level Detected Limit (TT) 0.32 NTU 1 NTU No Soil runoff
99.97% 0.3 NTU in 95% No Soil runoff
Units Lead (2018) 1 ppb AL = 15
ppm AL = 1.3
Copper (2018)
1
Substance
Violation Possible Source
90
%-tile Range 0 2.62 ND-6.29 No Corrosion of household plumbing systems
0 0.203 ND-0.294 No Corrosion of household plumbing systems
PB Plant JK Plant
2017
2018
1.43
<1.0 5 NA No
th
Violation Possible Source
Violation Possible Source
Radium 228 pCi/L Beta/Photon Emitters pCi/L 4.8 4.5 50 NA No
Gross Alpha Particle Activity pCi/L <2.0 <3.0 15 NA No
2
Action No. Sites >
Level Action Level
Substance
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
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
3
(PB = Pierce-Burch Plant)
Microbiological contaminants In 2018, Tarrant Regional Water District analyzed all raw water sources for cryptosporidium and no detections
were found in any raw water sources used for the City of Arlington. Cryptosporidium is a pathogen which may be found in water
contaminated by animal waste. Although filtration removes cryptosporidium, it cannot guarantee 100% removal.
Turbidity for both Plants 5
Highest Single Measurement
Lowest monthly %
meeting limits
1
Decay of natural and man-made depos-
its. Testing for radiological substances
required every 3 years.
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.
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.
4
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.
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.
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.