Oregon camping water: official advisories and what to do

Official Oregon advisory pages

• Oregon Health Authority: current algae advisories table and map (Link checked Oct 29, 2026)

Check the official map before swimming or collecting water. We never call a lake safe.

Campgrounds near lakes and rivers in Oregon

• Detroit Lake State Recreation AreaDetroit LakeOfficial park pageCheck current advisories
• Wallowa Lake State ParkWallowa Lake / Wallowa RiverOfficial park pageCheck current advisories
• Prineville Reservoir State ParkPrineville Reservoir / Crooked RiverOfficial park pageCheck current advisories

Links checked Oct 29, 2026.

Oregon tips

• The Oregon Health Authority lists current algae advisories in a table and on a map. Both are updated as advisories are issued and lifted.
• Oregon warns that only a fraction of its waterbodies are monitored, and that “a waterbody with no recreational health advisory does not mean that a bloom is not present.” Its advice is: “when in doubt, stay out.”

Water from a lake, river or stream? What to do

1. Avoid it first if you see a bloom. Green, blue-green or brown scum, “pea soup” or spilled-paint water means stay out and don't drink, cook with or filter it, and keep pets out. Minnesota Dept. of Health says backcountry treatment devices can't remove algae toxins, and that boiling won't remove them and can even raise toxin levels. Find another source.
2. Filter. If the water is cloudy, let it settle and then filter it. Filtering removes many germs but not dissolved chemicals or toxins.
3. Boil or disinfect. CDC says boiling is the best way to kill germs: a rolling boil for 1 minute, or 3 minutes above 6,500 feet. The next best option is to filter and then disinfect. Follow the product label. See also EPA's emergency disinfection steps. Boiling and disinfecting don't make water with chemicals or toxins drinkable.
4. Test when you can. A home kit or a certified lab can check things like bacteria and nitrate, which is useful for a cabin well or a spring you use often. Test strips can't detect algae toxins, so a “clean” strip result doesn't mean a bloom is harmless.

No advisory doesn't mean no bloom. Oregon's health authority warns: “A waterbody with no recreational health advisory does not mean that a bloom is not present” (OHA). Check the official map before swimming or collecting water. When in doubt, stay out. More on blooms: EPA harmful algal blooms.