Arlington Water Utilities | 2024 WATER QUALITY REPORT
Table B | Unregulated Contaminants
Unregulated contaminants are those for which EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted.
SUBSTANCE
UNITS
ANNUAL RUNNING AVERAGE OF ALL SAMPLES AVERAGE
LEVEL
MINIMUM LEVEL
MAXIMUM LEVEL
MCL MCLG
POSSIBLE SOURCE OF SUBSTANCE
Chloroform |
ppb |
3.10 |
2.70 |
3.40 |
NE |
NE |
By-product of drinking |
|
Bromodichloromethane
Chlorodibromomethane
|
ppb ppb |
3.70
3.90
|
3.50
3.50
|
3.90
4.40
|
NE
NE
|
NE
60
|
water disinfection; not regulated individually; included in Total |
Bromoform |
ppb |
0.80 |
0.50 |
1.30 |
NE |
NE |
Trihalomethanes |
Dichloroacetic Acid ppb 3.68 3.26 3.90 NE NE Bromoacetic Acid ppb 0.35 0.12 0.78 NE NE Dibromoacetic Acid ppb 1.54 1.50 1.61 NE NE Chloroacetic Acid ppb 2.44 1.47 3.03 NE NE Trichloroacetic Acid ppb ND ND 0.01 NE 300
By-product of drinking water disinfection; not regulated individually; included in Haloacetic Acids.
Other Substances of Interest
SUBSTANCE |
UNITS |
AVERAGE LEVEL |
MINIMUM LEVEL |
MAXIMUM LEVEL |
Calcium |
ppm |
31.0 |
25.0 |
37.0 |
Chloride |
ppm |
19.0 |
17.0 |
22.0 |
Magnesium |
ppm |
4.36 |
4.23 |
4.49 |
pH |
pH units |
8.05 |
7.35 |
8.47 |
Potassium |
ppm |
4.97 |
4.73 |
5.20 |
Sodium |
ppm |
25.4 |
24.6 |
26.2 |
Sulfate |
ppm |
42.1 |
38.0 |
49.2 |
Alkalinity, Total |
ppm |
83.2 |
58.8 |
106 |
Total Dissolved Solids |
ppm |
190 |
139 |
233 |
Hardness, Total( as CaCO3) |
ppm grains / gallon |
93.2
5.4
|
70.0
4.1
|
117
6.8
|
Water Treatment Process
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Reservoirs
Distribution
Raw Water Pump Station
Pre-Ozonation
Clearwell Storage
Mixing Sedimentation chamber Basin
Secondary Disinfection( Chloramine)
Coagulation Basin
Primary Disinfection( Ozone)
Filters
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