Approved Drinking Water Laboratories

1 TEXAS COMMISSION ON ENVIRONMENTAL QUALITYA pproved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division. The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) WSC LaboratorySteve Dunn293 Industrial BoulevardBastrop, TX 78602 Phone Number:Fax Number:(512) 581-0705 Lab ID:AnalyteMethodValid UntilTX285 Accreditation ID:T10470430912/6/2021 Approval Date:Alkalinity2320B6/30/2022 Calcium3500-CA B6/30/2022 Conductivity2510B6/30 Laboratories , LLCR ebecca Gowdy5935 Glenoak LnAmarillo, TX 79109-6831 Phone Number:Fax Number:(806) 353-4425(806) 352-6454 Lab ID:AnalyteMethodValid UntilT104704346 Accreditation ID:T10470434612/6/2021 Approval Date.

2 Alkalinity2320B6/30/2022 Conductivity2510B6/30/2022PH4500H-B6/30/ 2022 Temperature25506/30/2022 brownsville PUB - Analytical LaboratoryJose Ramon Saenz1385 PUB , TX 78520 Phone Number:Fax Number:(956) 983-6356(956) 983-6359 Lab ID:AnalyteMethodValid Until48116 Accreditation ID:T10470435712/2/2021 Approval Date:Alkalinity2320B6/30/2022 Calcium3500-CA B6/30/2022 Chlorine Dioxide4500 CLO2-E6/30/2022 Chlorite4500 CLO2-E6/30/2022 Conductivity2510B6/30/2022 Free Chlorine4500CL-G6/30/2022pH4500H-B6/30/2 022 Temperature25506/30/2022 TOC5310B6/30/2022 Total Chlorine4500CL-G6/30/2022 Turbidity2130B6/30/2022UV2545910B6/30/20 22 Thursday, January 6, 2022 Page 1 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division.

3 The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) Laboratories , Box 1622, 861 Hwy 19 Huntsville, TX 77320-1111 Phone Number:Fax Number:(936) 291-1881(936) 295-1731 Lab ID:AnalyteMethodValid UntilT104704204 Accreditation ID:T10470420412/2/2021 Approval Date:Alkalinity2320B6/30/2022 Calcium3111B6/30/2022 Conductivity2510B6/30 of Abilene Environmental LaboratoryMike Michaud4209 East Lake RdAbilene, Texas 79601 Phone Number:Fax Number:(325) 676-6041(325) 676-6044 Lab ID:AnalyteMethodValid UntilT104704320 Accreditation ID:T1047043201/5/2022 Approval Date:Alkalinity2320B6/30 DioxideCHLORDIOX PLUS6/30/2022 Chlorine Dioxide4500 CLO2-E6/30 Chlorine4500CL-F6/30/2022 Turbidity2130B6/30/2022UV2545910B6/30/20 22 City of Arlington Water Utilities Lab ServicesAnn Lawson1901B Lakewood , Texas 76013 Phone Number:Fax Number:(817) 575-8966 Lab ID:AnalyteMethodValid Until48102 Accreditation ID:T1047043109/14/2021 Approval Date:Alkalinity2320B6/30/2022 Calcium3500-CA B6/30/2022 Conductivity2510B6/30/2022 Free Chlorine4500CL-G6/30 Chlorine4500CL-G6/30/2022 Turbidity2130B6/30/2022UV2545910B6/30/20 22 Thursday, January 6, 2022 Page 2 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division.

4 The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) of Corpus Christi Water LabMarisa Juarez13101 Leopard Christi, TX 78410-4524 Phone Number:Fax Number:(361) 826-1201(361) 242-9131 Lab ID:AnalyteMethodValid UntilTX290 Accreditation ID:T10470438612/29/2021 Approval Date:Alkalinity2320B6/30/2022 Calcium3500CA-B6/30/2022 Chlorine DioxideCHLORDIOX PLUS6/30 of Fort Worth Central LaboratoryDavid Nelson2600 SE Loop 820 Fort Worth, Texas 76140 Phone Number:Fax Number:(817) 392-5900(817) 392-5920 Lab ID:AnalyteMethodValid Until48135 Accreditation ID:T10470420012/17/2021 Approval Date:Alkalinity2320B6/30/2022 Calcium3500CA-B6/30/2022 Conductivity2510B6/30/2022 Free Chlorine4500CL-F6/30 Chlorine4500CL-F6/30/2022 Turbidity2130B6/30/2022UV2545910B6/30/20 22 City of Odessa Laboratory ServicesJason Wells817 W.

5 42nd , TX 79764 Phone Number:Fax Number:(432) 368-3536 Lab ID:AnalyteMethodValid Until48156 Accreditation ID:T10470436311/29/2021 Approval Date:Alkalinity2320B6/30/2022 Free ChlorineHACH 102606/30/2022PH4500H-B6/30/2022 Temperature25506/30/2022 TOC5310B6/30/2022 Total ChlorineHACH 102606/30/2022UV2545910B6/30/2022 Thursday, January 6, 2022 Page 3 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division. The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) Environmental Lab, PlunkettPO Box 1089 Coldspring, TX 77331 Phone Number:Fax Number:(936) 653-3249(936) 653-3172 Lab ID:AnalyteMethodValid UntilTX203 Accreditation ID:T1047042751/3/2022 Approval Date:Alkalinity2320B6/30 Chlorine4500CL-F6/30 Chlorine4500CL-F6/30/2022 Turbidity2130B6/30/2022UV2545910B6/30/20 22 Eastex Environmental Lab, Inc.

6 - NacogdochesPaul D. Hughes1119 South University DriveNacogdoches, TX 75961 Phone Number:Fax Number:(936) 569-8879(936) 569-8951 Lab ID:AnalyteMethodValid UntilTX00962 Accreditation ID:T10470431612/29/2021 Approval Date:Alkalinity2320B6/30/2022 Conductivity2510B6/30/2022 Orthophosphate4500P-E6/30/2022pH4500H-B6 /30/2022 Temperature25506/30/2022 Turbidity2130B6/30/2022 Envirodyne Laboratories , Bonjonia11011 Brooklet Drive, Suite 230 Houston, TX 77099 Phone Number:Fax Number:(281) 568-7880(281) 568-8004 Lab ID:AnalyteMethodValid UntilTX288 Accreditation ID:T10470426512/3/2021 Approval Date:Alkalinity2320B6/30 Chlorine4500CL-G6/30/2022 Orthophosphate4500P-E6/30/2022pH4500H-B6 /30 Chlorine4500CL-G6/30/2022 Turbidity2130B6/30/2022 Thursday, January 6, 2022 Page 4 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division.

7 The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) Monitoring Laboratory, LLCS erissa BeckPO Box 477 Hillsboro, TX 76645 Phone Number:Fax Number:254-582-2622 Lab ID:AnalyteMethodValid UntilTX01547 Accreditation ID:T10470424710/8/2021 Approval Date:Free Chlorine4500CL-G6/30/2022 Total Chlorine4500CL-G6/30/2022 Eurofins Eaton Analytical, LLC - South BendDale Piechocki110 South Hill StreetSouth Bend, IN 46617 Phone Number:Fax Number:(574) 472-5523(574) 233-8207 Lab ID:AnalyteMethodValid UntilTX207 Accreditation ID:T1047041877/8/2021 Approval Date:Alkalinity2320B6/30 Dioxide4500 CLO2-D6/30 Chlorine4500CL-G6/30/2022 Hardness2340B6/30/2022 Orthophosphate4500P-E6/30 Chlorine4500CL-G6/30 Regional LaboratoryKylie Gudgell933 East Court StreetSeguin, TX 78155 Phone Number:Fax Number:(830) 379-5822(830) 379-9718 Lab ID:AnalyteMethodValid Until48136 Accreditation ID:T10470426912/6/2021 Approval Date:Alkalinity2320B6/30 , January 6, 2022 Page 5 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division.

8 The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) Water Quality LaboratoryTeresa T. Alcala4100-L Delta DriveEl Paso, Texas 79905-4306 Phone Number:Fax Number:(915) 594-5444 Lab ID:AnalyteMethodValid Until48134 Accreditation ID:T1047043658/30/2021 Approval Date:Alkalinity2320B6/30 Chlorine4500CL-G6/30 - Environmental Laboratory ServicesDale Jurecka3505 Montopolis DrAustin, TX 78744 Phone Number:Fax Number:(512) 356-6022(512) 356-6021 Lab ID:AnalyteMethodValid UntilT104704218 Accreditation ID:T10470421812/29/2021 Approval Date:Alkalinity2320B6/30 Chlorine4500CL-G6/30/2022UV2545910B6/30/ 2022 North Texas MWD Environmental LaboratoryCatherine Hobbs201 E.

9 Brown StreetWylie, Texas 75098 Phone Number:Fax Number:469-626-4613 Lab ID:AnalyteMethodValid Until48175 Accreditation ID:T10470428112/3/2021 Approval Date:Alkalinity2320B6/30 , January 6, 2022 Page 6 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division. The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) Water District Laboratory Services, Martin130 South Trade Center ParkwayConroe, TX 77385 Phone Number:Fax Number:(936) 321-6060(936) 321-6061 Lab ID:AnalyteMethodValid UntilTX204 Accreditation ID:T10470423812/30/2021 Approval Date:Alkalinity2320B6/30 Chlorine4500CL-G6/30/2022 Hardness2340B6/30/2022 Orthophosphate4500P-E6/30 Chlorine4500CL-G6/30 Analytical Services, LLC - Ormond Beach FLLynn Baylor8 E Tower CircleOrmond Beach, FL 32174 Phone Number:Fax Number:(386) 676-4803(386) 673-4001 Lab ID:AnalyteMethodValid UntilTX246 Accreditation ID:T1047041847/1/2021 Approval Date.

10 Alkalinity2320B6/30 Dioxide4500 CLO2-D6/30 Chlorine4500CL-D6/30/2022 Hardness (CaCO3)2340B6/30/2022pH4500H-B6/30 Chlorine4500CL-D6/30 Joy, IncRhonda Scrogin19020 W Little York RoadKaty, TX 77449-7243 Phone Number:Fax Number:(281) 858-5988 Lab ID:AnalyteMethodValid UntilTX01572 Accreditation ID:T1047043726/29/2021 Approval Date:Free Chlorine4500CL-G6/30/2022pH4500H-B6/30/2 022 Temperature25506/30/2022 Total Chlorine4500CL-G6/30/2022 Thursday, January 6, 2022 Page 7 of 10 Approved Drinking Water LaboratoriesThe following list of Laboratories are Approved by the TCEQ's Drinking Water Standards Division. The list indicates each Approved Drinking Water analyte and method for each laboratory listed. For questions related to individual laboratory approval please call (512) River Authority of TexasPollie Holtham1895 I-P WayOrange, Texas 77632 Phone Number:Fax Number:(409) 746-3284(409) 746-3780 Lab ID:AnalyteMethodValid Until48155 Accreditation ID:T1047042668/31/2021 Approval Date:Alkalinity2320B6/30/2022 Conductivity2510B6/30/2022 Free Chlorine4500CL-F6/30/2022pH4500H-B6/30 Chlorine4500CL-F6/30/2022 Turbidity2130B6/30/2022 San Antonio Testing Laboratory, LLCM arcela Hawk1610 S Laredo StreetSan Antonio, TX 78207-7029 Phone Number:Fax Number:(210) 229-9920(210) 229-9920 Lab ID:AnalyteMethodValid UntilTX274 Accreditation ID:T1047043601/5/2022 Approval Date:Alkalinity2320B6/30 North America Inc.