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Source Water Monitoring

Water quality solutions designed for monitoring natural water sources. Monitoring water quality in reservoirs, lakes, and impoundments before the raw water enters the plant for treatment can save you time and money later.

Water quality solutions designed for monitoring natural waters used as drinking water sources
Water quality solutions designed for monitoring natural waters used as drinking water sourcesWater quality solutions designed for monitoring natural waters used as drinking water sources Collect real-time data at multiple depths in drinking water columnCollect real-time data at multiple depths in drinking water column

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Find a Distributor

YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI Source Water Monitoring products and accessories.

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Get Support

Have a question about using your YSI equipment in Source Water Monitoring? Ask our application specialists!

Contact Technical Support

Product Service Centers

Want to return a product for service? Here you’ll find authorized service centers and instructions on how to send in your YSI Source Water Monitoring product.

Product Service

YSI multiparameter long-term monitoring sondes and SonTek/YSI velocity instruments characterize water quality before, during, and after events such as storms, droughts, and floods, providing managers with critical data about the health of a water network.

In addition to event monitoring, establishing baseline water quality standards has become increasingly important for protecting source water as it is affected by urbanization and agricultural changes.


EXO1 water quality sonde from YSI

EXO1 Water Quality Sonde

The EXO1 multiparameter water quality sonde collects data with up to four user-replaceable smart sensors and an integral pressure transducer for depth.


 EXO2 water quality sonde from YSI

EXO2 Water Quality Sonde

Collect data to 250 m with the advanced EXO2 sonde – six replaceable smart sensors and a central wiper to clean biofouling.


YSI 6600V2 Comprehensive Monitoring System - View of Sensor Configuration


Make the most of your environmental monitoring.


The YSI 6600 V2 data sonde is the most comprehensive water quality monitoring equipment available with simultaneous measurement of conductivity (salinity), temperature, depth or level, pH/ORP plus...


YSI 6820 V2 showing sensors, starting clockwise from top: ROX Optical Dissolved Oxygen, Turbidity, pH, ISE, and temperature/condutivity.

6820 V2

Compact Sonde for Field Sampling


The YSI 6820 V2 is a cost-effective data sonde for profiling and spot-checking water quality in rivers, lakes, wetlands, wells, estuaries, and coastal waters.


    YSI 600OMS V2 shown with probe guard attached.

    600OMS V2

    Single-Parameter, Low-Cost Optical Monitoring System


    Measure optical dissolved oxygen, chlorophyll, blue-green algae, rhodamine, or turbidity in combination with temperature, conductivity and depth. Designed for use in fresh, sea or polluted waters, the 600OMS V2 data sonde utilizes the field-proven YSI sensors and incorporates innovations in water quality sensor configuration such as a conductivity and temperature module that fits into the sonde body.


    The YSI 6600EDS showing Turbidity (center) with attached wiper brush, Clockwise from top: Chlorophyll, pH/ORP, Temperature/Conductivity, and Rapid Pulse Dissolved Oxygen Sensors.


    Extended Deployment for Harsh Environments


    The 6600EDS multiparameter sonde accurately measures 10 parameters in severe fouling environments for extended periods. The sonde has two optical ports, conductivity/temperature port, Rapid Pulse DO port, and pH/ORP port. The 6600EDS also offers an extended brush that cleans the pH/ORP and Rapid Pulse DO sensors.


    YSI 6500 Process Monitor

    6500 Process Monitor

    Improve Operational Efficiency with Continuous Data


    With 8 scalable 4-20 mA current loop channels, 4 SPDT relays, and the ability to continuously monitor dissolved oxygen, conductivity, temperature, and pH via a YSI 6-Series sonde, the YSI 6500 helps you stay one step ahead in data collection.


    AQUARIUS Profiling Software Vertical Data Graph

    AQUARIUS Profiling

    AQUARIUS Profiling is designed for scientists and engineers who need to visualize and analyze vertical water column data in a powerful and flexible environment. Vertical water quality profiling data taken either manually or automatically and analyzed in AQUARIUS Profiling provides significantly more information than data collected at a single depth.


    YSI Pro2030 Field Dissolved Oxygen/Conductivity Meter


    Field Dissolved Oxygen / Conductivity

    "YSI did a great job on this design.  Our staff of about 20 people consists of old veterans to recent college grads, and not one so far has had a negative comment."

    The Pro2030 provides everything you need in a handheld dissolved oxygen meter that automatically compensates for changes in salinity values. Rugged, simple and reliable.

    Measure DO, salinity, conductivity, specific conductance, TDS, barometric pressure and temperature.


    YSI EcoSense 9300 Photometer

    9300 / 9500 Photometer

    Waterproof, rugged, easy to use photometers


    The YSI 9300 and YSI 9500 are economical photometers in small packages for any application. These portable photometers allow you to easily take readings directly in the field for 100+ parameters.


    Multiparameter Colorimeter - YSI pHotoFlex STD

    pHotoFlex Colorimeters

    The pHotoFlex line of colorimeters is the newest addition to YSI's full range of colorimeters. These rugged, waterproof, multiparameter colorimeters are ideal for laboratory and field testing.


    Catalogs & Brochures

    YSI Colorimetry Catalog

    Water Quality Sampling for Field and Laboratory

    Source Water Monitoring Case Studies & Solutions

    YSI Vertical Profiling Systems

    Source Water Monitoring - Applications, Capabilities & Solutions

    Water Monitoring Solutions

    6-Series Multiparameter Water Quality Sondes

    Français - Sondes multiparamètres série 6 surveillance des eaux

    Deutsch - 6-Serie Multiparameter Wasserqualitäts-Messsonden

    Japanese - YSI 6シリーズ 多項目水質モニター

    Application Notes

    Students Monitor Harlem River Water Quality and Air Quality, Seek Solutions

    Catchment Monitoring Network Protects Thames River

    Vertical Profiling Safeguards Drinking Water and Sheds Light on Cyanobacteria

    Managing and Protecting Remote Source Water for the East Bay Area

    Managing the Demand for Clean, Safe Water in the Middle of Nutrient-Laden Farmland

    Public-Private Contract Safeguards Malaysia’s Water Quality

    Water Intake Monitoring System Provides Reliable Data while Reducing Frequency of Site Visits

    Unattended Water Quality Monitoring Protects Domestic Water Supply at Taiwan’s Shimen Reservoir

    Mapping Water Quality of Drinking Water Reservoir Using an AUV

    Imposed Water Quality Conditions with Drought Permits

    Thames Water Employs Reservoir Profi ler to Reduce Costs

    Monitoring and Protecting Water Quality in Lake Mead, Nevada

    Monitoring the Water Quality of Lake Olathe and Protecting Drinking Water for Olathe Residents

    Continuous Monitoring of Drinking Water Provides Assurance of Safety

    Drinking Water Monitoring with YSI Instruments and Systems

    YSI Technology Used to Monitor Source Water Before Reaching Treatment Plants in New York City

    Monitoring Long-term Source Water Trends with the YSI 6500




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