In addition to the information shared on this YSI environmental site, many other organizations have published the results of their water quality monitoring programs and improved techniques. Check them out.
Charlotte-Mecklenberg Continuous Monitoring and Alert Notification Network
City of Kissimmee (FL) Watershed Monitoring Stations
Grassland (CA) Water District Ecological Area
Gulf of Maine Ocean Observing System
Kansas Real-time Water Quality Monitoring (USGS)
NCSU Cyanobacteria Project- North Carolina Reservoirs
Sanibel-Captiva Conservation Foundation - River, Estuary and Coastal Observing Network
SC DNR/Apache Pier Cooperative Real-time Water Quality & Weather Monitoring Station
USGS Water Quality Watch - Continuous Real-Time Water Quality of Surface Water in the U.S.
Chesapeake Bay NERR Guidelines for Shallow Water Quality Monitoring: Continuous Monitoring Stations [PDF]
Chap 3: Selection and Assembly of the Sensors Protection Device
Maryland DNR Shallow Water Monitoring Program Quality Assurance Project Plan (QAPP)
National Park Service Depth Calibration Procedure for Non-Vented Water Level Instruments
SWAMP (CA) Quality Assurance Program Plan
TCEQ Continuous Water Quality Monitoring Network SOPs
USGS: Guidelines and Standard Procedures for Continuous Water-Quality Monitors
Alliance for Coastal Technologies Reports:
National Water Quality Monitoring Council
NWQMC Methods and Data Comparability Board - Field Monitoring Quality Assurance Initiative
NERRS System-wide Monitoring Program
NOAA Integrated Ocean Observing System