These products support the design and implementation of Online Water Quality Monitoring (OWQM), a component of a Surveillance and Response System (SRS).

• Environmental Technology Verification Program and Technology Testing and Evaluation Program summarize the results of third-party evaluations of OWQM technologies. This includes:
  • Assessment of accuracy
  • Performance under extended deployment
  • Inter-unit reproducibility
  • Response to injected contaminants
  • Operational and maintenance requirements
  • Ease of use and data acquisition
• Event Detection System Deployment, Integration and Evaluation System (EDDIES)(15 pp, 33 MB)  A software application that supports real-time data analysis for OWQM and the evaluation of valid and invalid alert rates.  

• Online Source Water Quality Monitoring for SRSs (PDF)(114 pp, 8 MB)
  Provides guidance for designing a real-time source water quality monitoring system to achieve a variety of design goals, including: treatment process optimization, detection of source water contamination incidents, and monitoring threats to long-term source water quality.
• Exploratory Analysis of Time-series Water Quality Data (PDF)(36 pp, 2 MB)
  Provides guidance for analyzing time-series water quality data in order to methodically characterize normal variability and identify the factors that impact water quality at individual monitoring locations. The exploratory analysis should be performed prior to real-time operations so that the real-time water quality data can be properly interpreted.
• EDDIES Version 4.4 User Reference Guide (PDF)(132 pp, 3 MB)
  Provides more details on EDDIES and its use. Section 3 of the guide describes how to install EDDIES from the ZIP file.
• Distribution System Water Quality Monitoring: Sensor Technology Evaluation Methodology and Results (PDF)(60 pp, 1 MB)
  Provides a summary of the ability of various OWQM sensors to detect a wide range of contaminants. Describes the operation and maintenance requirements of each.