ESV

E.S.I. Environmental Sensors Inc. ("ESI" or the "Company") (TSX VENTURE: ESV) is pleased to announce the installation of a GroPoint™ Wireless system by Agriculture and Agri-Food Canada (AAFC) and the Saskatchewan Ministry of Agriculture (Sask Ag). The system will be deployed at the Outlook Crop Diversification Center, jointly operated by AAFC and Sask Ag.

AAFC and Sask Ag will initiate their use of the GroPoint™ Wireless monitoring system under irrigation pivots in a variety of crops for the upcoming 2011 growing season. The system consists of a series of field nodes, soil moisture sensors and a weather station, which will feed real-time, soil moisture and weather data via a wireless network to researchers through ESI's GroPoint™ Manager software.

The system serves several purposes and will provide a multitude of benefits to researchers, growers and the agricultural community. The system will allow scientists to gather data while they perform various research projects on demonstration plots and will verify the efficiency of irrigation equipment systems. The system will assist irrigation managers (growers) in analyzing their irrigation methods, allowing them to make better decisions regarding when and how to irrigate. Staff at the center will also demonstrate the GroPoint™ Wireless system and monitoring equipment on tours and field days, which are held regularly for members of the agricultural community. It is anticipated that the research and results from this facility will be shared both federally through AAFC and provincially with other provincial agricultural ministries. As well, it is hoped that as ESI continues to build on its established credibility in the scientific and research communities, this visibility will assist ESI in its efforts to further penetrate the commercial agriculture market. Pivot irrigation is a significant potential market for ESI - there are nearly 300,000 pivots in operation in North America.

About ESI

ESI is a leading manufacturer of patented and proprietary solutions for environments where understanding the presence, movement, and/or amount of water are important. Major market sectors include: agriculture, golf and turf, scientific research, civil engineering, mining, environmental monitoring and crude oil production. 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. In addition, ESI's FloPoint™ instrument has been deployed in the oil industry to measure the volumetric presence of water pumped during crude oil extraction for characterization and optimization of the process. 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.esica.com.

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Contacts: E.S.I. Environmental Sensors Inc. Investor Relations 250.655.3211 or 1-800.799.6324 investor.relations@esica.com E.S.I. Environmental Sensors Inc. Bernard M. Beauchesne Media and Investor Relations 250.655.3211 or 1-800.799.6324 bbeauchesne@esica.com www.esica.com