Water Testing Information

A water sample bottle station is available just inside the first set of doors of the Okanogan County Public Health District (OCPHD) office in Okanogan where empty water sample test bottles and forms can be picked up, or water samples can be dropped off into a cooler. Water samples can also be dropped off at your local City Hall for pick-up on the first Monday of each month -- see the Water Sample Pickup table below for more details!


  • Nitrate / Chemical (MUST be kept cold! / chilled, on ice)
    • Monday - Wednesday, 7:30 a.m. ~ 3:00 p.m. 
NOTICE! Please do not attempt to send water samples through the postal mail as they are too old to process when they arrive.

If you have questions regarding the information above, please call (509) 422-7140.

Water Sample Pickup Available on the First Monday of Each Month 

For your convenience, we have coordinated with local area city halls for a water sample pickup service.
You may drop off your water testing samples according to the following schedule:

 Oroville City Hall  9:00 a.m. to 11:30 a.m.
 Tonasket City Hall  9:00 a.m. to 12:00 noon
 Brewster City Hall  9:00 a.m. to 12:30 p.m.
 Pateros City Hall  9:00 a.m. to 1:00 p.m.
 Winthrop City Hall  9:00 a.m. to 1:30 p.m.
 Twisp City Hall  9:00 a.m. to 2:00 p.m.

  • If a Monday pickup service falls on a holiday, there will be no service that day. The pickup day will occur the next business day instead.
  • Reminder! If Nitrate water samples are left at a city hall for pickup, the sample MUST be kept cold, either by refrigeration or by leaving it on ice.


For answers to your questions about water sample testing, please call the OCPHD Water Laboratory direct line at (509) 422-7395.


OCPHD, PO Box 231, 1234 South 2nd Avenue, Okanogan, WA  98840  (509) 422-7140