ACZ Laboratories
www.acz.com

Aquifer Science & Technology
aquiferscience.com

Baski, Inc.
www.baski.com

Carmeuse Industrial Sand
http://www.carmeusena.com

Clear Creek Associates
www.clearcreekassociates.com

Columbia Analytical
www.caslab.com

Daniel B. Stephens & Associates Inc.
www.dbstephens.com

E. L. Montgomery and Associates Inc.
www.elmontgomery.net

EnviroTech Services Company
www.envirotechonline.com

Geoscience Support Services Inc.
www.gssiwater.com

GeoSystems Analysis Inc.
www.gsanalysis.com

Geotech Environmental Equipment Inc.
www.geotechenv.com

Golder Associates
www.golder.com

Hach Environmental
www.hachenvironmental.com

Hargis + Associates Inc.
www.hargis.com

HydroSystems Inc.
www.hydrosystems-inc.com

HydroGeophysics Inc.
www.hydrogeophysics.com

In-Situ Inc.
www.in-situ.com

Instrumentation Northwest
www.inwusa.com

INTERA Inc.
www.intera.com

Layne Christensen Company
www.laynewater.com

LFR Levine-Fricke
www.lfr.com

Midwest GeoSciences Group
www.midwestgeo.com

MWH Americas
www.mwhglobal.com/namerica_map.asp

Onset Computer Corp
www.onsetcomp.com

Regenesis
www.regenesis.com/

RockWare Inc.
www.rockware.com

Roscoe Moss Company
www.roscoemoss.com

Schlumberger Water Services
www.water.slb.com

Solinst
www.solinst.com

SonTek/YSI
www.sontek.com/

Stewart Brothers Drilling Co.
www.stewartbrothers.com

Southwest Exporation Services LLC
www.swexp.com

TAM International
www.tamintl.com

Teledyne RD Instruments
www.rdinstruments.com

URS Corporation
www.urscorp.com

John J. Ward
www.wardgroundwater.com

YSI
www.ysi.com

Zonge Engineering and Research
Organization Inc.
www.zonge.com

ZymaX
www.zymaxusa.com