Arlington Water Utilities | 2025 WATER QUALITY REPORT
Table Definitions
Action Level( AL): The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow.
Avg: Regulatory compliance with some MCLs are based on running annual average of monthly samples.
Level 1 Assessment: A study of the water system to identify possible problems and determine( if possible) why total coliform bacteria were found.
Level 2 Assessment: A very detailed study of the water system to identify potential problems and determine( if possible) why an E. Coli Maximum Contaminant Level( MCL) violation has occurred and / or why total coliform bacteria were found on multiple occasions.
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 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 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.
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 reflect the benefits of the use of disinfectants to control microbial contamination.
ND( Not detected): No level of the parameter was detected.
NA: Not applicable. 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.
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.
<( xxx): Less than the amount listed. ≥( xxx): Equal to or greater than the amount listed.
Total Organic Carbon( TOC)
SOURCE
Total Organic Carbon( TOC) Pierce Burch( PB) Treatment Plant
Total Organic Carbon( TOC) John Kubala( JK) Treatment Plant
WATER SOURCE
AVG. LEVEL
MIN. LEVEL
MAX. LEVEL
UNITS
Raw 5.4 5.1 6.1 ppm Drinking 3.0 2.6 3.9 ppm
1.3 1.0 1.4 removal ratio *
Raw 5.5 4.3 6.9 ppm Drinking 3.0 2.5 4.3 ppm
1.3 0.8 1.8 removal ratio *
POSSIBLE SOURCE OF SUBSTANCE
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.
Microbiological Substances
Tarrant Regional Water District analyzed all raw water sources for cryptosporidium in 2025. For every quarter in 2025, there were no detections of cryptosporidium. Cryptosporidium is a pathogen which may be found in water contaminated by feces. Although filtration removes cryptosporidium, it cannot guarantee 100 % removal.
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