Water Quality Data Report 2021 This report contains water data for the City of DeSoto and Dallas Water Utilities. The list includes parameters which are tested for, in accordance with Federal and State Water Quality Regulations. The frequency of testing varies depending on the parameters and are in compliance with established standards. . This report lists all of the federally regu- lated or monitored contaminants which have been found in your drinking water. The U.S. EPA requires water systems to test forup to 97 contaminants. REGULATED LEVEL DALLAS CollecƟon Date Average Minimum Maximum MCL MCLG Unit of Measure Source of Contaminants Inorganic Contami- nants
Erosion of natural deposits; water addiƟve which promotes strong teeth. Run - off from ferƟlizer use; leaching from sepƟc tanks, sewage, erosion of natural deposits. Run - off from ferƟlizer use, leaching from sepƟc tanks, sewage, erosion of natural deposits. Discharge of drilling waste; discharge from metal refineries; erosion of natural deposits. Discharge from steel/metal factories: discharge from plasƟc and ferƟlizer factories.
Fluoride
2021
0.674
0.648
0.715
4
4
ppm
Nitrate (as N)
2021
0.526
0.396
0.666
10
10
ppm
Nitrite (as N)
2013
0.017
<0.004
0.032
1
1
ppm
Barium
2021
0.029
0.024
0.033
2
2
ppm
Cyanide
2021
71.8
38.3
113.0
200
200
ppb
RadioacƟve Contaminants Gross beta parƟcle acƟvity
2017
5.1
4.2
6.6
50
0
pCi/L****
Decay of natural or man - made deposits.
Disinfectant Total Chlorine Residual
Minimum
Maximum
MRDL
MRDLG
In distribuƟon system — Water addiƟve used to control mi- crobes.
2021
2.89
2.65
3.01
4*
4*
Ppm
Lead and Copper
90th PercenƟle
# of sites exceeding acƟon level
Unit of Measure
Corrosion of household plumbing systems; erosion of natural deposits Corrosion of household plumbing systems; erosion of natural deposits
Lead
2021
0
0
AL=15
0
ppb
Copper
2021
0.26
0
AL=1.3
1.3
ppm
Organic Contami- nants Atrazine
2021
0.13
0.10
0.20
3
3
ppb
Runoff from herbicide on row crops.
Simazine
2021
0.06
<0.06
0.11
4
4
ppb
Runoff from herbicide on row crops.
DisinfecƟon By Products Total HaloaceƟc Acid*** Total Trihalome- thanes
Highest LRAA
2021
14.0
1.4
21.3
60
N/A
ppb
Byproduct of drinking water disinfecƟon.
2021
20.8
6.9
31.4
80
ppb
Byproduct of drinking water disinfecƟon.
N/A
Bromate
2021
6
<5
12
10
0
ppb
Byproduct of drinking water disinfecƟon.
Total Organic Carbon Total Organic Carbon
TT (no MCL)*****
2021
% removal/SUVA ≤2
ppm
Naturally present in the environment.
2.89
2.65
3.01
Highest Single Measurement
Lowest monthly % of samples meeƟng limits
Turbidity
Turbidity limits
Unit of Measure
Turbidity
2021
95% of readings ≤ 0.3 (TT)
NTU
Soil runoff
0.45
99%
Total Coliforms Total Coliforms Bacteria
Highest Monthly % of PosiƟve Samples
Unit of Measure
2021
0.3%
5% or more of monthly samples
Found/Not Found
Naturally Present in the environment.
DESOTO
Maximum Contaminant Level Goal
Total Coliform Maximum Contami- nant Level 5% of monthly samples are posiƟve
Fecal Coliform or E. Coli Maximum Contaminant Level
Total # of PosiƟve E. Coli or Fecal Coliform Samples
Highest Monthly % of PosiƟve Samples
Total Coliforms Total Coliforms Bacteria
ViolaƟon
0
2021
0
0
N
Naturally present in the environment
Disinfectant
Average
Minimum
Maximum
MRDL
MRDLG
Unit of Measure
Total Chlorine Residual
2021
1.90
0.71
3.40
4*
4*
ppm
In distribuƟon system — water addiƟve used to control microbes
Inorganic Contami- nants Nitrate (measured as Nitrogen)
Highest Level Detected
Range of Individual Samples
CollecƟon Date
MCLG
MCL
Unit of Measure
ViolaƟon
Runoff from ferƟlizer use; leaching from sepƟc tanks, sewage; erosion of natural deposits
2021
1
0.521 - 0.521
10
10
ppm
N
Range of Individual Samples
DisinfecƟon By Products
Highest Level Detected
CollecƟon Date
MCLG
MCL
Unit of Measure
ViolaƟon
HaloaceƟc Acid (HAA5)*
2021
7
1.5 - 9.9
No goal for the total
60
ppb
N
By - product of drinking water disinfecƟon
Total Trihalome- thanes (TTHM)
2021
17
12.5 - 16.3
No goal for the total
80
ppb
N
By - product of drinking water disinfecƟon
*as annual average ***HaloaceƟc Acids — five species \****50 pCi/L — 4 mrem/yr *****Treatment technique requires 35% removal or SUVA ≤2. The percentage of Total Organic Carbon (TOC) removal was measured each month and the system met all TOC removal require- ments.
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