Table A | Regulated Substances
Substances that are regulated or are required to be monitored and were detected in Arlington tap water in 2025
SUBSTANCE UNITS
AVG. LEVEL
MIN. LEVEL
Arsenic ppb 0.80 ND 1.50 10 N / A
Barium ppm 0.045 0.042 0.048 2 2
Cyanide ppb 90.3 76.6 104 200 200
Bromate 1 ppb < 5 < 5 < 5 10 10
Fluoride ppm 0.52 0.17 0.77 4 4
Nickel ppb 1.25 1.20 1.30 100 100
Nitrate ppm 0.370 0.185 0.844 10 10
Nitrite ppm < 0.05 < 0.05 0.129 1 1
MAX. LEVEL MCL MCLG POSSIBLE SOURCE OF
SUBSTANCE
Chloramines 2 ppm 3.7 3.4 3.8 MRDL = 4 MRDLG = 4
Total Trihalomethanes 2 ppb 11.5 10.5 12.6 80 NA
Haloacetic Acids( HAA5) 2 ppb 7.8 7.1 8.4 60 NA
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.
Naturally present or byproduct of agricultural and industrial activities
Discharge from metal and chemical factories, well drilling operations
Discharge from metal and chemical factories
Byproduct of drinking water disinfection
Water additive promoting strong teeth
Naturally present or byproduct of metal and industrial processes
Runoff from fertilizers or livestock feedlots
Runoff from fertilizers or livestock feedlots
Water additive used to control microbes
By-product of drinking water disinfection
By-product of drinking water disinfection
Turbidity
TURBIDITY FOR BOTH PLANTS UNITS AVG. LEVEL
MIN. LEVEL MAX LEVEL.
MCL |
MCLG |
SOURCE OF |
|
|
POSSIBLE |
|
|
SUBSTANCE |
Highest single measurement NTU 0.09 0.02 0.38 TT = 1.0 0 Soil runoff Percentage of samples less than 0.3 NTU % 98.83 % TT = 95 %
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. These organisms include bacteria, viruses and parasites that can cause symptoms such as nausea, cramps, diarrhea and associated headaches.
Radioactive Substances
SUBSTANCE UNITS
PB PLANT 2023 *
JK PLANT 2024 *
MCL
Radium 228 pCi / L < 1 < 1.0 5 NA Beta / Photon Emitters pCi / L 4.2 4.5 50 NA Gross Alpha Particle Activity pCi / L < 3 < 3.0 15 NA * Most recent testing cycle as required by the TCEQ.
MCLG
POSSIBLE SOURCE OF SUBSTANCE
Decay of natural and man-made deposits
3