2023 Water Quality Report 2023 Water Quality Report | Page 4

2023 WATER QUALITY REPORT page 4

The new Arlington Water Utilities Laboratory and Maintenance Building at the John F . Kubala Water Treatment Plant on U . S . Hwy 287 will be open in Spring 2024 . The $ 12 million project has been under construction since May 2022 . The new modern 26,825-square-foot facility replaces a lab building and maintenance facilities that are too small and outdated for the department ’ s current needs .

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

ANNUAL RUNNING AVERAGE OF ALL SAMPLES

UNITS AVG . LEVEL

MIN . LEVEL

MAX . LEVEL

MCL Chloroform ppb 2.60 2.10 3.30 NE NE Bromodichloromethane ppb 3.60 3.10 4.30 NE NE Chlorodibromomethane ppb 4.30 3.70 4.90 NE 60 Bromoform ppb 1.60 1.50 1.80 NE NE

MCLG

POSSIBLE SOURCE OF SUBSTANCE

By-product of drinking water disinfection ; not regulated individually ; included in Total Trihalomethanes

Dichloroacetic Acid ppb 3.51 3.31 3.80 NE NE Bromoacetic Acid ppb 0.25 ND 0.39 NE NE Dibromoacetic Acid ppb 1.73 1.64 1.9 NE NE Chloroacetic Acid ppb 1.11 0.52 1.77 NE NE

By-product of drinking water disinfection ; not regulated individually ; included in Haloacetic Acids .

Trichloroacetic Acid ppb 0.01 ND 0.02 NE 300

Hardness , Total ( as CaCO3 )

ppm 91.8 82 120 grains / gallon 5.4 4.8 7.0