North Kootenai Water District
P.O. Box 2290, Hayden, ID 83835
208-772-3619, 208-762-0355 (fax)
ContactUs@NKWSD.com

Backflow Prevention

All Lawn Irrigation Systems Require Backflow Prevention!

All backflow prevention assemblies must be tested annually at spring start up for proper operation and protection.

Why?

Lawn irrigation systems make watering lawns and gardens easier, save you time, and can be designed to be water efficient. However, water contaminated by weed killers, fertilizers, and animal waste can backflow into your drinking water. To protect your drinking water from potential contamination, it is important to have an approved backflow protection assembly on your irrigation system. Lawn irrigation systems do require special equipment to prevent contaminated water from siphoning back into your home plumbing and public water systems.

  • A Backflow Assembly
    • Double Check Valve
    • Pressure Vacuum Breaker
    • Atmospheric Vacuum Breaker

A lawn irrigation system not protected by an approved backflow prevention assembly endangers the health of a household, neighborhood, and community!

All lawn irrigation systems - new or existing - must be equipped with an Idaho State approved backflow prevention assembly. Only an Idaho state and plumbing code approved backflow prevention assembly properly installed will meet the state plumbing code requirements and provide proper protection for the health of your family and neighbors.

How does backflow happen?

Backflow is water flow in reverse direction from the normal direction of flow in a piping system. This occurs due to different pressures existing between two different points within a piping system; water of a higher pressure flowing to water of lower pressure.

Backflow may occur due to either backsiphonage or backpressure.

Backsiphonage - is caused by negative pressure in the piping system.

  • A water line repair or break that is lower than a water service point.
  • A lower water main pressure due to a high water usage rate such as in fire fighting or water main flushing.
  • Reduced water supply pressure on the suction side of a water booster pump.

Backpressure - occurs when the water supply piping is connected to a piping system or plumbing fixture which exceeds the operating pressure of the water supply piping.

  • Booster pumps
  • Water supply line connections to a boiler or other heating systems where thermal expansion is possible
  • Connecting to a water system that operates at a higher pressure

The following list is for informational purposes only.

Backflow Testing Services:

Accent Landscaping 765-3064
Advanced Sprinklers 687-1955
All American Backflow Testing 623-5099
Applied Landscaping Concepts 509-994-3504
Aqua Tech Plumbing 772-5051
Auto Rain Sprinkler 509-487-3430
Auto Rain CDA Sprinkler 676-8384
B & B Enterprise Service, LLC 769-1844
Backflow Northwest 661-1222
Backflow Preventions 704-1770
Backflow Supply 800-733-6730
Big Bear Landscape 699-6009
Cascade Irrigation/Landscaping, Inc. 772-2757
Coeur d'Alene Landscape 664-1217
Coeur d'Alene Sprinkler 676-8384
Country Home Landscaping 772-7555
Darnall Sprinklers 777-7688
DCT Controls 509-487-0666
Dew Drop Sprinklers 509-922-7168
Divco 509-534-7225
Done Right Sprinklers 704-8104
ETCO Services 762-5888
Gold Seal Service 509-535-5946
Grasshopper Lawn & Landscape 651-7268
Greenbelt Enterprises 659-5496
Hard to Scape 755-4830
Steve Herres 509-780-1258
Hydronics 509-484-3565
JC Sprinklers 665-7150
Kraig Kincheloe 262-2222
Lakeside Landscape 762-0735
Les's Backflow Services 818-4869
McMillen Landscaping 762-1530
Night Rain Sprinklers 667-6735
North Idaho Sprinklers 773-2796
Northwest Tractor Works 687-6989
Oakland Plumbing 667-4006
Patriot Fire Protection, Inc. 509-926-3428
R&J Landscaping & Sprinkler 762-9367
Ramsey Plumbing & Heating 509-482-2775
Ken Reimer 664-0649
Rocky's Landscape & Sprinklers, LLC 640-0284
Sapphire Landscaping 704-2144
Second to None Landscape & Sprinklers 209-5121
Senske Lawn and Tree Care 929-0052
Specialty Sprinkler 687-5312
Rob Stark 699-1456
Three-D Enterprises 623-6059
United Plumbing 509-922-5000

The following firms also offer fire protection systems testing:

Advanced Fire Protection 509-489-5040
Cascade Fire Protection 509-466-6096
Fire Control Sprinkler Systems 509-489-1444
Oxarc Fire Equipment 509-533-1017
Patriot Fire Protection 509-926-3428
Simplex-Grinnell 509-534-6055
Western States Fire Protection 509-922-8890