This interactive map shows average (median) water quality conditions in 2025 for all sites that were tested at least 10 times. The color coding matches the scheme used on the Izaak Walton League’s Clean Water Hub. Note that chloride has a lower detection limit between 25-30 mg/L and transparency has an upper detection limit of 60 cm.
Green = Excellent
Yellow = Good
Orange = Fair
Red = Poor.
Gray = Not tested.
Zoom in and click on a site to get a pop-up window with more detailed results. If pop-ups don’t respond, try toggling between water quality metrics first.