2022 WATER QUALITY REPORT page 2
TABLE A | REGULATED SUBSTANCES
Substances that are regulated or are required to be monitored and were detected in Arlington tap water in 2022
SUBSTANCE UNITS AVG . LEVEL
MIN . LEVEL
MAX . LEVEL
Arsenic ppb 1.50 1.10 1.80 10 NA
Barium ppm 0.052 0.046 0.058 2 2
MCL MCLG POSSIBLE SOURCE OF SUBSTANCE
Naturally present or byproduct of agricultural and industrial activities
Discharge from metal and chemical factories , well drilling operations
Cyanide ppb 16.8 ND 33.5 200 200 Discharge from metal and chemical factories Bromate 1 ppb < 5 < 5 < 5 10 10 Byproduct of drinking water disinfection Fluoride ppm 0.27 0.104 0.691 4 4 Water additive promoting strong teeth Chromium ppb 1.8 1.70 1.90 100 100 Discharge from metal and chemical factories Nitrate ppm 0.382 0.067 0.672 10 10 Runoff from fertilizers or livestock feedlots Nitrite ppm < 0.05 ND 0.149 1 1 Runoff from fertilizers or livestock feedlots Chloramines 2 ppm 3.4 3.3 3.4 MRDL = 4 MRDLG = 4 Water additive used to control microbes Total Trihalomethane 2 ppb 9.1 7.9 10.5 80 NA Byproduct of drinking water disinfection Haloacetic Acids ( HAA5 ) 2 ppb 5.4 5.3 5.5 60 NA Byproduct of drinking water disinfection
1
Compliance is based on a calculated running annual average of the quarterly averages .
2
Compliance is based on a calculated annual average of all samples at routine sites .
SUBSTANCE UNITS ACTION LEVEL |
NO . OF SITES EXCEEDING ACTION LEVEL |
90 TH % -TILE |
DETECTED RANGE |
POSSIBLE SOURCE OF SUBSTANCE |
Lead ( 2020 ) 3 ppb AL = 15 1 1.203 ND-22.5 Corrosion of household plumbing systems
Copper ( 2020 ) 3 ppm AL = 1.3 0 0.164 ND-0.353 Corrosion of household plumbing systems
3
Instead of MCLs for lead and copper , EPA requires that 90 % of water samples obtained from customers ’ taps contain less than the action level for each metal .
Total Organic Carbon ( TOC )
SOURCE |
WATER SOURCE |
AVG . LEVEL |
MIN . LEVEL |
MAX . LEVEL |
UNITS |
POSSIBLE SOURCE OF SUBSTANCE |
Total Organic Carbon ( TOC ) Pierce Burch Treatment Plant
Total Organic Carbon ( TOC ) John Kubala Treatment Plant
Raw |
6.2 |
5.2 |
7.2 |
ppm |
Drinking |
3.7 |
3.4 |
3.9 |
ppm |
|
1.2 |
1.0 |
1.5 |
removal ratio * |
Raw |
5.6 |
4.1 |
6.5 |
ppm |
Drinking |
3.5 |
3.1 |
3.6 |
ppm |
|
1.1 |
1.0 |
1.3 |
removal ratio * |
Naturally present in the environment
Naturally present in the environment
* Removal ratio is the percent of TOC removed by the treatment process divided by the percent of TOC required by TCEQ to be removed . Compliance is based on a running annual average of ratio ’ s . If the annual average removal ratio is greater than or equal to 1.0 , the system is in compliance .