What does blue spray paint on grass mean?
William Howard
Published Apr 21, 2026
BLUE: Potable, Water. GREEN: Sewers and Drain Lines. PURPLE: Reclaimed Water, Irrigation and Slurry Lines.
What does blue spray paint mean?
This marking paint indicates that what is underneath is natural gas lines, oil, steam, petroleum, or other gaseous or flammable material. Proceed with urgency. Not many folks get a second chance if they ignore yellow paint markings. Blue – Potable (drinkable) water.What does the spray paint on the ground mean?
JIM WITMER / STAFF (Jim Witmer) April 17, 2018 at 2:21 pm EDT. All those colored lines you see spray painted on the ground, streets and sidewalks typically mean one thing: someone's going to start digging. Each color tips off a worker to what's underground.What colors are used for marking utilities?
As a quick refresh, the APWA color code for utility marking is:
- Red: electric power lines, cables, conduit and lighting cables.
- Orange: telecommunication, alarm or signal lines, cables or conduit.
- Yellow: natural gas, oil, steam, petroleum or other flammable.
- Green: sewers and drain lines.
- Blue: potable drinking water.