ESI Corporate Update

Victoria, British Columbia August 5, 2009 – E.S.I. Environmental Sensors Inc. (ESI), TSX-V: ESV ("ESI" or the "Company") announces that the Management Cease Trade Order ("MCTO") announced on August 6, 2009 remains in effect. The MCTO was applied for due to the default in meeting the filing deadline for the Company's audited annual financial statements, management discussion and analysis ("MD&A") and executive certificates for the year ended March 31, 2009 (the "required annual filings"). The Company had anticipated the completion of the required annual filings by August 31, 2009, however, has been forced to revise this to September 30, 2009.

In addition, the interim quarterly filings, including the financial statements, MD&A and executive certificates, for the three month period ended June 30, 2009 will be not be filed until after the completion of the required annual filings. It is anticipated that the interim quarterly filings will be filed by October 31, 2009. The Management Cease Trade Order will remain in effect until the Company is no longer in default of its filing requirements.

About ESI

ESI is a leading manufacturer of patented and proprietary solutions for managing the world's fresh water supply. Major market sectors include: Agriculture, Golf and Turf, Scientific Research, Civil Engineering and Crude Oil. ESI solutions have been successfully introduced into more than 40 countries to enable customers to optimize their operations by monitoring the presence and movement of water, managing irrigation systems, and monitoring the integrity of landfill covers. Most recently, the Flo·Point™ instrument has been introduced to the Oil industry to measure the volumetric presence of water pumped during crude oil extraction. This provides operators with the information needed to manage, refine and optimize production. ESI differentiates itself by translating the best technology and science available into practical, easy to use solutions. Irrigation managers, Reservoir Engineers, and Scientists have adopted ESI's products for their accuracy, ease of use, repeatability, and ability to operate in challenging environments. ESI is publicly traded on the TSX Venture Exchange under the symbol "ESV". Further information about ESI may be obtained through the Company's website at www.esisensors.com.

ESI ENVIRONMENTAL SENSORS INC.
2071C Malaview Avenue West
Sidney, BC V8L 5X6
Tel: 250.655.3211 or 1-800.799.6324
Email: investor.relations@esica.com

MEDIA CONTACT:
Ian Middleton, Managing Director
Email: Ian.Middleton@esica.com
Tel: 250.655.3211 or 1-800.799.6324
www.esisensors.com

THE TSX VENTURE EXCHANGE HAS NOT REVIEWED AND DOES NOT ACCEPT RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS RELEASE.

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