3804 S. Lake Ave., Caldwell, ID 83605
Phone: (208) 459-3617
FAX: (208) 459-4491
Please don't send mail to the address above - if you need to mail something to the District, please mail it to:
PO Box 426, Caldwell, ID 83606
Pioneer's offices are open Monday - Friday from 9:00am - 5:00pm. Pioneer observes all Federal holidays, for which the office will be closed.
Get in Touch
If you are experiencing an after-hours emergency with one of Pioneer's facilities, you may call 208-250-8481 for emergency response.