Water Testing Information

Holiday Water Testing Lab CLOSED
Memorial Day Water lab will be closed MON 05/27/2024

Empty water sample bottles are available for free at a table just inside the first set of doors of the
Okanogan County Public Health District (OCPHD) office in Okanogan and your local City Hall.

Each water sample, its completed form, and test fee can be brought to our front counter before 3:00 p.m.

In addition, see the table below about the monthly Water Sample Pick-Up service at your local City Hall.

Do not under fill or over fill the water sample bottle! The water level must be between the line marked on the sample bottle and the lid to be accepted for testing. Samples with the water level below the line or above the shoulders of the bottle when it is at rest cannot be tested. 
Water level above line


  Nitrate / Chemical
  • Monday - Wednesday, 7:30 a.m. ~ 3:00 p.m. 
  • Each test is $35.00 
  • MUST be kept cold! / chilled, on ice, refrigerated
Please do not send water samples through the postal mail
as they will be too old to process when they arrive.
water samples
accepted on
water samples
accepted on

  Coliform / Bacteria
water samples
accepted on
Monthly Water Sample Pick-Up Available at City Hall
For your convenience, we have coordinated with local area city halls to schedule a water sample pick-up service on the first Monday each month. You may drop off your water testing samples at one of the following locations before the pick-up window indicated in the following table:

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

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

Click here to visit the Drinking Water Program webpage for links to other services and information.
OCPHD at 1234 South 2nd Avenue, Okanogan, WA  98840  (509) 422-7140